Page 1
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 1 © Tritech International Ltd.
Gemini Imaging Sonar
Product Manual
Document: 0685-SOM-00001, Issue: 11
Page 2
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 2 © Tritech International Ltd.
© Tritech International Ltd
The copyright in this document is the property of Tritech International Ltd. The document is supplied by Tritech International Ltd on
the understanding that it may not be copied, used, or disclosed to others except as authorised in writing by Tritech International Ltd.
Tritech International Ltd reserves the right to change, modify and update designs and specifications as part of their ongoing
product development programme.
All product names are trademarks of their respective companies.
Page 3
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 3 © Tritech International Ltd.
Table of Contents
Help & Support ........................................................................................................... 5
Warning Symbols ........................................................................................................ 6
Included Equipment .................................................................................................... 7
Head Variations .......................................................................................................... 8
1. Introduction ............................................................................................................. 9
1.1. General Overview ........................................................................................ 9
1.2. Communications ........................................................................................... 9
1.3. Electrical Connection .................................................................................... 9
1.4. Software Version ........................................................................................ 10
2. Technical Specification .......................................................................................... 11
2.1. Gemini 720i ............................................................................................... 11
2.2. Gemini 720id .............................................................................................. 12
2.3. VDSL Adapter ............................................................................................ 13
2.4. Ethernet Adapter ........................................................................................ 14
3. Hardware Installation & Configuration ..................................................................... 15
3.1. Installing the Sonar Head ........................................................................... 15
3.2. Electrical & Communication Notes ............................................................... 15
3.3. Sonar Head Pin-Out (Impulse Titan Connector) ........................................... 16
3.3.1. Impulse Titan MKS-310-FCR (Ethernet Port) ..................................... 17
3.3.2. Impulse Titan MKS(W)-307-FCR (VDSL Port) ................................... 17
3.4. Sonar Head Pin-Out (Burton Connector) ...................................................... 17
3.4.1. Burton 5506-1508 (Main Port) .......................................................... 18
3.4.2. Burton 5506-1506 (Auxiliary Port) ..................................................... 18
3.5. Cable Specification ..................................................................................... 18
3.5.1. Ethernet Cable ................................................................................ 18
3.5.2. VDSL Cable .................................................................................... 19
3.5.3. Burton 55A1-1506 (Auxiliary) Port Cable ........................................... 19
3.6. Surface Adapter Pin-out Diagrams .............................................................. 20
3.6.1. Ethernet Adapter ............................................................................. 20
3.6.2. VDSL Adapter ................................................................................. 21
3.7. An Example Ethernet Setup ........................................................................ 21
3.8. An Example VDSL Setup ............................................................................ 22
3.9. An Example ROV Setup ............................................................................. 22
3.10. Multiple Head Installation .......................................................................... 23
4. Gemini Software Installation .................................................................................. 24
4.1. System Requirements ................................................................................. 24
4.2. Installing the Gemini Software ..................................................................... 24
4.3. Configuring the Gemini ............................................................................... 24
4.3.1. Check the operation of the Gemini ................................................... 25
5. Gemini Software Operation .................................................................................... 26
5.1. User Screen ............................................................................................... 26
5.1.1. Overview ......................................................................................... 26
5.1.2. Online Button .................................................................................. 27
5.1.3. Record Button ................................................................................. 28
5.1.4. Player Controls ................................................................................ 28
5.1.5. Capture Screen ............................................................................... 30
5.1.6. Record Video .................................................................................. 31
5.1.7. Invert Display (Up/Down) ................................................................. 31
5.1.8. Flip Image (Left/Right) ..................................................................... 31
5.1.9. Draw Grid ....................................................................................... 32
5.1.10. Zoom Button .................................................................................. 32
5.1.11. Filter Selector ................................................................................ 32
5.1.12. Sound Velocity Indicator ................................................................. 33
5.1.13. Palette Selector ............................................................................. 33
5.1.14. Gain Assist .................................................................................... 33
Page 4
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 4 © Tritech International Ltd.
5.1.15. Gain Control .................................................................................. 33
5.1.16. Range Control ............................................................................... 34
5.1.17. Indicators ...................................................................................... 34
5.1.18. Measurements ............................................................................... 34
5.1.19. Warnings ....................................................................................... 35
5.2. Advanced Screen ....................................................................................... 36
5.2.1. System Data ................................................................................... 36
5.2.2. Configuration Options ...................................................................... 37
5.2.3. Application Settings ......................................................................... 40
5.2.4. Filter Settings .................................................................................. 42
5.2.5. Device Network Settings .................................................................. 43
5.2.6. Distance Marker .............................................................................. 43
5.2.7. Target Tracking ............................................................................... 44
5.3. Serial Data Input ........................................................................................ 48
5.3.1. Sonars & Sensors ........................................................................... 48
5.3.2. Gemini Hub ..................................................................................... 49
5.3.3. COM Ports ...................................................................................... 50
5.4. Multiple Head Operation ............................................................................. 51
5.5. Offline Mode .............................................................................................. 53
5.6. Automatic Online ........................................................................................ 53
5.7. Settings Files ............................................................................................. 53
5.8. Keyboard Shortcuts .................................................................................... 54
6. Seanet Pro Installation .......................................................................................... 55
7. Seanet Pro Operation ........................................................................................... 56
7.1. Seanet Setup for Gemini ............................................................................ 56
7.2. Gemini Sonar Application ........................................................................... 58
7.2.1. Sonar Settings ................................................................................. 58
7.2.2. Application Tools ............................................................................. 59
8. Maintenance ......................................................................................................... 65
8.1. After using Sonar ....................................................................................... 65
8.2. If storing the sonar for extended periods ...................................................... 65
8.3. Regular maintenance .................................................................................. 65
9. Troubleshooting .................................................................................................... 66
A. Setting the computer IP address in Windows XP .................................................... 68
B. Setting the computer IP address in Windows 7 ...................................................... 70
C. Setting the Gemini Device IP Address in Gemini Software ...................................... 72
D. Setting the Gemini Head IP Address in Seanet Pro ................................................ 73
E. Gemini Software String Decode ............................................................................. 75
Glossary ................................................................................................................... 77
Page 5
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 5 © Tritech International Ltd.
Help & Support
First please read this manual thoroughly (particularly the Troubleshooting section, if present).
If a warranty is applicable, further details can be found in the Warranty Statement, 0080STF-00139, available upon request.
Tritech International Ltd can be contacted as follows:
Mail Tritech International Ltd
Peregrine Road
Westhill Business Park
Westhill, Aberdeenshire
AB32 6JL, UK
Telephone ++44(0)1224 744 111
Fax ++44(0)1224 741 771
Email support@tritech.co.uk
Website www.tritech.co.uk
Prior to contacting Tritech International Ltd please ensure that the following is available:
1. The Serial Numbers of the product and any Tritech International Ltd equipment connected
directly or indirectly to it.
2. Software or firmware revision numbers.
3. A clear fault description.
4. Details of any remedial action implemented.
Contamination
If the product has been used in a contaminated or hazardous environment you
must de-contaminate the product and report any hazards prior to returning the
unit for repair. Under no circumstances should a product be returned that is
contaminated with radioactive material.
The name of the organisation which purchased the system is held on record at Tritech
International Ltd and details of new software or hardware packages will be announced at
regular intervals. This manual may not detail every aspect of operation and for the latest
revision of the manual please refer to
www.tritech.co.uk
Tritech International Ltd can only undertake to provide software support of systems loaded
with the software in accordance with the instructions given in this manual. It is the customer's
responsibility to ensure the compatibility of any other package they choose to use.
Page 6
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 6 © Tritech International Ltd.
Warning Symbols
Throughout this manual the following symbols may be used where applicable to denote any
particular hazards or areas which should be given special attention:
Note
This symbol highlights anything which would be of particular interest to the reader
or provides extra information outside of the current topic.
Important
When this is shown there is potential to cause harm to the device due to
static discharge. The components should not be handled without appropriate
protection to prevent such a discharge occurring.
Caution
This highlights areas where extra care is needed to ensure that certain delicate
components are not damaged.
Warning
DANGER OF INJURY TO SELF OR OTHERS
Where this symbol is present there is a serious risk of injury or loss of life. Care
should be taken to follow the instructions correctly and also conduct a separate
Risk Assessment prior to commencing work.
Page 7
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 7 © Tritech International Ltd.
Included Equipment
Note
Each Gemini Sonar head is able to use either the VDSL or Ethernet
communications system and therefore may be converted with the addition of the
appropriate peripherals.
The following equipment may be included:
1. Gemini sonar head (either shallow or deep rated)
2. Surface adapter (either VDSL or Ethernet)
3. Gemini PSU for use with surface adapter
4. Bench testing cable (either VDSL or Ethernet)
5. Blanking cap for unused connector (may be included in an accessories kit with spare Orings)
Also provided will be a sonar head flight case, Gemini software, Seanet Pro software
and documentation. The latest documentation and software updates are available through
www.tritech.co.uk.
Note
For part numbers for ordering replacement parts please refer to the original
purchase documentation or contact Tritech International Ltd support to discuss
upgrade options.
Page 8
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 8 © Tritech International Ltd.
Head Variations
VDSL
Ethernet
Impulse Connectors
Gemini 720i (300m depth rating)
Impulse Connectors
VDSL
Ethernet
Burton Connectors
Auxiliary
Main
Gemini 720id (4000m depth rating)
Finished in titanium (silver/grey) or aluminium (black anodised)
Page 9
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 9 © Tritech International Ltd.
1. Introduction
1.1. General Overview
The Gemini is a 2D imaging sonar. It is a multibeam sonar, offering a 120° field of view with
update rates of up to 30Hz giving rapid feedback to the user (hardware is capable of 30Hz,
Seanet Pro is limited to 15Hz).
The system consists of the Gemini sonar head(s) and either Gemini or Seanet Pro control
and display software. The software communicates with the sonar over Ethernet (100Mbit·s-1),
or Very high speed Digital Subscriber Line (VDSL) via a VDSL to Ethernet converter.
The software is Windows based and will run best on a display of resolution 1280x1024 or
greater with 32-bit colour resolution.
1.2. Communications
There are two connection options, 100Mbit·s-1 Ethernet and VDSL. The sonar will
automatically detect which connection is available and switch to that connection.
The VDSL option allows a single twisted pair to be used for communication to/from the sonar
at high speeds dependent on the length and quality of the cable (see Chapter 2, Technical
Specification for details). The Tritech International Ltd supplied VDSL Adapter Unit takes the
two wire VDSL input and bridges it to Ethernet for simple connection to a PC.
VDSL maximises the data rate by testing the quality of the connection at start up and adapting
the speed accordingly. With VDSL there is a trade off between link speed and noise immunity.
There is a setting in the software that allows optimisation to cope with the level of noise
introduced by other parts of the system.
Note
The red LED on the VDSL adapter box may light up to indicate that the link is
experiencing higher levels of electrical noise. The sonar can cope with some
electrical noise on the link but it may reduce the ping rate.
When using an Ethernet connection it should be noted that the Gemini Sonar can fully utilise
a 100Mbit·s-1 link while returning the sonar data. If the Gemini Sonar is to share an Ethernet
link with other high bandwidth devices, such as video cameras, it is recommended that the
100Mbit·s-1 devices share a gigabit (or faster) link to the surface to reduce possible network
congestion.
1.3. Electrical Connection
If the Gemini head is fitted with the Impulse connectors; only one of the connectors can be
used at a time for communication with the surface, however, power can be supplied on either
connector. When using a Gemini head fitted with a Burton connector the main port is used
for communication and power and the auxiliary port is used for external devices.
Page 10
Introduction Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 10 © Tritech International Ltd.
Caution
Power should only be supplied on one connector at a time.
1.4. Software Version
Note
The instructions within this manual apply to software version 2.00.13 onwards.
Screenshots and images wihin the software may differ slightly from the ones
used within this manual. Please visit
www.tritech.co.uk for the latest software.
Page 11
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 11 © Tritech International Ltd.
2. Technical Specification
2.1. Gemini 720i
175
228
43
M5 x 0.8 10
123
110
115
135
Not to scale, dimensions in mm.
Acoustic
Operating Frequency 720kHz
Number of Channels 96
Angular Resolution 1.0° acoustic, 0.5° effective
Scanning Sector 120°
Number of Beams 256
Vertical Beamwidth 20°
Range 0.2m to 120m
Scan Rate 5-30Hz (range dependent)
Range Resolution 8mm (range dependent)
Electrical and Communication
Power Consumption 35W max (range dependent, head unit only)
Supply Voltage 20 - 75V DC
Data Communications Ethernet (up to 80m) or VDSL (up to 1000m)
Additional I/O RS232, Isolated TTL in
VDSL Cable Length
Maximum length for VDSL and power is 300m, if power is provided locally
(e.g., by the ROV) then maximum cable length for VDSL communication only
is 1000m.
Page 12
Technical Specification Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 12 © Tritech International Ltd.
Physical
Weight 3.9kg air, 1.2kg water
Depth Rating 300m
Materials & Finish Aluminium alloy (6082T6) hard anodised
Operating Temperature -10 to 35°C
Storage Temperature -20 to 50°C
2.2. Gemini 720id
120
306
324
Ø140
50
Not to scale, dimensions in mm.
Shown with Burton connector. Other connectors are available
Ø145
Acoustic
Operating Frequency 720kHz
Number of Channels 96
Angular Resolution 1.0° acoustic, 0.5° effective
Scanning Sector 120°
Number of Beams 256
Vertical Beamwidth 20°
Range 0.5 to 120m
Scan Rate 5-30Hz (range dependent)
Range Resolution 8mm (range dependent)
Electrical and Communication
Power Consumption 35W max (range dependent, head unit only)
Supply Voltage 20 - 75V DC
Data Communications Ethernet (up to 80m) or VDSL (up to 1000m)
Additional I/O RS232, Isolated TTL in
VDSL Cable Length
Maximum length for VDSL and power is 300m, if power is provided locally
(e.g., by the ROV) then maximum cable length for VDSL communication only
is 1000m.
Page 13
Technical Specification Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 13 © Tritech International Ltd.
Physical
Property Aluminium Body Titanium Body
Weight 8kg air, 3.5kg water 12kg air, 7.5kg water
Depth Rating 4000m 4000m
Materials Aluminium alloy (6082T6) Titanium (6 AL-4V)
Finish Hard anodised Bead blasted
Operating Temperature -10 to 35°C
Storage Temperature -20 to 50°C
2.3. VDSL Adapter
Not to scale, dimensions in mm.
130
151
70 160
Weight 1.1kg
Materials Enclosure: Aluminium alloy (AC-44300), Connectors:
thermoplastic
Finish Powder Coated
Operating Temperature 5 to 35°C
Storage Temperature -20°C to 50°C
Power Consumption 3.8W
Supply Voltage 22 - 75V DC
Data Communications Ethernet (10/100) Base-T (80m) VDSL (up to 1000m)
Connectors Souriau UTS7124P (mates with UTS6JC124S)
Souriau UTS7147S (mates with UTS6JC147P)
Souriau UTS718RJFN (mates with UTS6JC18RJN25)
Page 14
Technical Specification Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 14 © Tritech International Ltd.
2.4. Ethernet Adapter
Not to scale, dimensions in mm.
130
151
70 160
Weight 1.1kg
Materials Enclosure: Aluminium alloy (AC-44300), Connectors:
thermoplastic
Finish Powder Coated
Operating Temperature 5 to 35°C
Storage Temperature -20°C to 50°C
Supply Voltage 22 - 75V DC
Data Communications 2x Ethernet (10/100) Base-T (80m)
Connectors Souriau UTS7124P (mates with UTS6JC124S)
Souriau UTS71412S (mates with UTS6JC1412P)
Souriau UTS718RJFN (mates with UTS6JC18RJN24)
Page 15
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 15 © Tritech International Ltd.
3. Hardware Installation & Configuration
Caution
Although the sonar head is rugged, it should be handled with care, particularly
the connector and receiver/transmitter elements. It is strongly recommended that
a substantial guard is fitted over the sonar to protect the transducer from impact
damage.
3.1. Installing the Sonar Head
The transducer should be mounted with the transmitter element on the bottom. The transmit
and receive elements are internally angled down at 10° which should be taken into account
when mounting the Sonar.
For the 720i there are 4 tapped M5 holes (10mm deep) on the top surface that are to be
used for mounting the sonar.
Any metallic clamps should be electrically insulated from the sonar body by either rubber or
plastic strips or mounting brackets of at least 3 mm thickness and extending at least 3 mm
beyond the clamp boundary to reduce any galvanic corrosion effect. Non-metallic clamps are
preferable; if metallic clamps are used (especially if they are not aluminium) they should be
painted or lacquered with at least two or three coatings.
Caution
Any alloy containing copper such as brasses or bronze should be avoided
because they will severely corrode the aluminium body.
1. Sound Velocity Probe
2. Receiver Elements
3. Transmitter Elements
3.2. Electrical & Communication Notes
Either an Ethernet or VDSL cable whip is supplied with the appropriate connector fitted to one
end. The other end should be terminated with a suitable connector for the user application.
Page 16
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 16 © Tritech International Ltd.
Connector Maintenance Guidelines
Mating surfaces should be lubricated with 3M Silicone Spray or equivalent, DO NOT
GREASE. Connectors must be lubricated on a regular basis. Lubricate O-rings with Dow
Corning #111 Valve Lubricant or equivalent. O-rings can be seriously degraded if exposed to
direct sunlight or high ozone levels for extended periods of time. Clean plugs and receptacles
with soap and fresh water.
Caution
Ensure that o-rings have been fitted correctly to cables and blanking caps before
use. O-rings should be inspected and replaced as part of a regular maintenance
programme. Frequency will depend on usage.
When attaching a connector make sure that both connector and socket are
completely dry. Any water trapped in the connection could result in an electrical
short.
If the Gemini has two ports then the unused connector must have a blanking cap
fitted prior to immersing in water. Failure to do this will cause permanent damage.
If using alcohol or IPA to clean out the connector take care that it does not come
into contact with any other part of the sonar. If an O-ring is present it should be
first removed and discarded and the new O-ring only inserted after the IPA has
evaporated.
Ground Fault Monitoring
The power supply within the Gemini includes an electrically isolated DC-DC converter frontend. There is a small capacitive connection between the isolated ground and the sonar
chassis which should not noticeably affect any impressed current ground fault indicator (GFI)
equipment.
Power
Caution
Never try to make the Gemini work down a long cable by increasing the PSU
output voltage above 75V DC.
Warning
The Gemini PSU that is supplied with the Gemini system is intended for INDOOR
USE ONLY and should not be placed in a position where it could get wet.
3.3. Sonar Head Pin-Out (Impulse Titan Connector)
Note
When fitted with the Impulse Titan style connector the VDSL and Ethernet are
on separate ports but cannot be operated at the same time. Whichever port is
not connected can be connected to RS232/TTL auxiliary devices.
Page 17
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 17 © Tritech International Ltd.
3.3.1. Impulse Titan MKS-310-FCR (Ethernet Port)
Pin Function Diagram Photograph
1 Ethernet RX +
2 Ethernet RX -
3 Ethernet TX +
4 DC +
5 DC +
6 Ethernet TX-
7 DC Ground
8 DC Ground
9 TTL Ground
12
4
6
8
7
5
3
10
9
10 TTL IN Impulse Titan MKS-310-FCR
3.3.2. Impulse Titan MKS(W)-307-FCR (VDSL Port)
Pin Function Diagram Photograph
1 DC Ground
2 DC +
3 RS232 RX
4 RS232 TX
5 RS232 Ground
6 VDSL +
4
1
2
5
3
6
7
7 VDSL - Impulse Titan MKS(W)-307-FCR
3.4. Sonar Head Pin-Out (Burton Connector)
Note
When fitted with the Burton style connector the VDSL and Ethernet are both on
the MAIN port of the sonar. The AUXILIARY port is only for the RS232 and TTL
connection.
Page 18
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 18 © Tritech International Ltd.
3.4.1. Burton 5506-1508 (Main Port)
Pin Function Diagram
1 Ethernet RX +
2 Ethernet RX -
3 Ethernet TX +
4 DC +
5 VDSL +
6 Ethernet TX -
7 DC Ground (0V)
8 VDSL -
5
6
4
1 2
3
7
8
5506-1508
3.4.2. Burton 5506-1506 (Auxiliary Port)
Pin Function Diagram
1 RS232 RX
2 RS232 TX
3 DC +
4 DC Ground (0V)
5 RS232/TTL Ground
6 TTL IN
6
5
4
1 2
3
5506-1506
3.5. Cable Specification
3.5.1. Ethernet Cable
For an Ethernet connection, the supplied cable is described below and should be terminated
with an appropriate connector for the intended application, for example, an RJ45 connector
for integration into a PC network.
Note
Ethernet connection requires a minimum of CAT5e shielded cable for the entire
cable run (max 80m), lengths of untwisted cable around connectors must be
kept to an absolute minimum. Untwisted lengths will cause poor or intermittent
operation.
Page 19
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 19 © Tritech International Ltd.
Ethernet Cable Specification
Impulse Titan
MKS-310-FCR
Burton 55A1-1508 Cable Colour &
Specification
Function
1 1 Red UTP#2
(24AWG)
Ethernet RX +
2 2 White UTP#2
(24AWG)
Ethernet RX -
3 3 Blue UTP#1
(24AWG)
Ethernet TX +
4 4 Red (20AWG) DC +
6 6 White UTP#1
(24AWG)
Ethernet TX -
7 7 Black (20AWG) DC Ground
Minimum dynamic bend radius 130mm (static 36mm)
3.5.2. VDSL Cable
A VDSL connection requires only one twisted pair from the sonar to the surface.
Note
The signal path should have a characteristic impedance of 110Ω (±10Ω) for the
entire cable run for optimal performance.
VDSL Cable Specification
Impulse Titan
MKS(W)-307-FCR
Burton 55A1-1508 Cable Colour &
Specification
Function
1 7 Black (20AWG) DC Ground
2 4 Red (20AWG) DC +
6 5 Blue UTP#1
(24AWG)
VDSL +
7 8 White UTP#1
(24AWG)
VDSL -
Minimum dynamic bend radius 129mm (static 35mm)
3.5.3. Burton 55A1-1506 (Auxiliary) Port Cable
An RS232 serial connection or TTL connection is possible to enable the use of an auxiliary
device or sensor connected in series with the Gemini head. A cable to connect to the
Auxiliary port is available from Tritech International Ltd with the following specification:
Note
It will be necessary to terminate this cable with an appropriate connector for the
sensor which is to be used.
Page 20
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 20 © Tritech International Ltd.
Burton 55A1-1506 Auxiliary Cable Specification
Pin Cable Colour &
Specification
Function
1 Red UTP#2 (24AWG) RS232 RX
2 White UTP#2 (24AWG) RS232 TX
3 Red (20AWG) DC +
4 Black (20AWG) DC Ground (0V)
5 White UTP#1 (24AWG) RS232/TTL Ground
6 Blue UTP#1 (24AWG) TTL In
Minimum dynamic bend radius 130mm (static 36mm)
3.6. Surface Adapter Pin-out Diagrams
Note
For all system types the connection to the surface computer or IT infrastructure
from the Gemini Hub, Ethernet or VDSL adapter should be via a shielded Cat5e
cable fitted with an RJ45 connector.
3.6.1. Ethernet Adapter
Sonar Head Connector
Pin Function Diagram Photograph
A Ethernet RX+
B Ethernet RX -
C Ethernet TX+
D DC +
E DC +
F Ethernet TX -
G DC Ground
H DC Ground
J not connected
K not connected
L not connected
E
D
C
B
A
J
H
M
K
L
F
G
M cable screen Souriau UTS71412S
Page 21
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 21 © Tritech International Ltd.
Ethernet DC Connector
Pin Function Diagram Photograph
1 DC Ground
2 DC +
3 not connected
4 1
3 2
4 not connected Souriau UTS7124P
3.6.2. VDSL Adapter
Sonar Head Connector
Pin Function Diagram Photograph
1 DC Ground
2 DC +
3 not connected
4 VDSL +
5 VDSL -
6 not connected
1
6
2 7
5
3
4
7 cable screen Souriau UTS7147S
VDSL DC Connector
Pin Function Diagram Photograph
1 DC Ground
2 DC +
3 not connected
4 1
3 2
4 not connected Souriau UTS7124P
3.7. An Example Ethernet Setup
Test or bench setup for the Gemini Sonar system using Ethernet communications via the
Ethernet adapter unit (Gemini 720i shown).
Page 22
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 22 © Tritech International Ltd.
3.8. An Example VDSL Setup
Test or bench setup for the Gemini Sonar system using VDSL communications via the VDSL
adapter unit (Gemini 720i shown).
3.9. An Example ROV Setup
An example of connections for an ROV, with the Gemini Sonar system using VDSL
communications via the VDSL adapter unit (Gemini 720i shown).
Page 23
Hardware Installation & Configuration Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 23 © Tritech International Ltd.
3.10. Multiple Head Installation
It is possible to control and display up to four Gemini heads from one computer using the
Gemini software. In order to do this extra hardware will be required to connect the extra
Gemini heads to the system as detailed:
Using the Gemini
Ethernet Interface Box
The Ethernet Interface Box will output to a standard Ethernet
connection so on a system with multiple heads it is possible
to connect these to an Ethernet switch. The Gemini sonar is
capable of utilising the full bandwidth of the 100Mbit·s-1 (fast
Ethernet) connection so any switch or hub (and subsequent
infrastructure) used should be rated to Gigabit speeds in order
to be able to cope with the data.
Using the Gemini Hub Available as a separate item from Tritech International Ltd is a
Gemini Hub which is capable of powering and communicating
with up to two Gemini sonars. The hub also provides RS232
ports for connecting additional sensors to the system (such as
GPS or navigation sensors). For more details of the Gemini
Hub please refer to the Gemini Hub manual or contact Tritech
International Ltd.
Page 24
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 24 © Tritech International Ltd.
4. Gemini Software Installation
The Gemini head is supplied with software to control the functions of the sonar and to display
the captured images. The software is supplied as an installer package which installs the
software and a number of supporting files and documentation.
Note
The software is also available for download from
www.tritech.co.uk
4.1. System Requirements
Minimum Recommended
Processor 2GHz 2GHz dual core
RAM 1GB 2GB
Graphics 3D hardware accelerated graphics card.
Display 1280x1024 (32bit colour) 1600x1200 (32bit colour)
Disk space Install is 20MB, greater than 160GB recommended for log files
Networking
100Mbit·s-1 (fast Ethernet) 1000Mbit·s-1 (Gigabit Ethernet)
Software Windows XP 32bit Windows 7 32 or 64bit
4.2. Installing the Gemini Software
The Gemini software is supplied on a USB memory stick as a Windows Installer Package
(with the .msi file extension). Doubling clicking the installation file will start the Windows
Installer and install the software onto the computer. Older units were supplied with a CDROM and it will auto-run upon disc insertion, if using a CD-ROM based installation, consider
updating to the latest version of the software from www.tritech.co.uk. During installation follow
the installer instructions, if required making any appropriate selections, to install the software.
4.3. Configuring the Gemini
The Gemini head uses Ethernet to communicate with the computer running the Gemini
software. Depending on the configuration of the system, this may be partly carried over a
VDSL link. Before the head can be connected to the LAN, the IP address needs to be set
to a suitable value for that network. Also the subnet mask needs to be appropriate for the
network and the address chosen.
Configuring the IP address of the Gemini is a four stage process. Firstly the IP address of
the computer is set to a value which will communicate with the head. The Gemini software is
then used to change the IP address of the Gemini. The third stage is to reset the IP address
of the computer. The final stage is to check the operation of the Gemini on the network (by
running the Gemini software and verifying that the Gemini head is able to communicate).
The following instructions use addresses 192.168.2.201 for the Gemini and 192.168.2.100
for the computer. These addresses are only appropriate for a new Gemini which has just
Page 25
Gemini Software Installation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 25 © Tritech International Ltd.
been delivered from the factory. If the IP address of Gemini has already been changed, an
appropriate address for the computer will need to be selected first to allow communication
with the Gemini before it can be configured.
The Gemini head should be given an IP address appropriate for the network it will be running
on. The address at manufacture is 192.168.2.201 and the process of setting the sonar IP
address involves talking to the unit via the 192.168.2.201 address to change the IP address
to a value suitable for the network.
Note
For instructions on setting the computer and Gemini IP address please refer to
Appendix A, Setting the computer IP address in Windows XP or Appendix B,
Setting the computer IP address in Windows 7 and Appendix C, Setting the
Gemini Device IP Address in Gemini Software.
4.3.1. Check the operation of the Gemini
If the correct changes have been made to the Gemini it should now show as connected in
the Gemini software. If nothing is displayed, check that all values entered were correct and
it may be necessary to rerun the Gemini software to establish a link. The Gemini software
retains its settings between runs, and so all the values which were used whilst the Gemini
was programmed will be retained.
When the Gemini software is started, select the Advanced tab to show details of the
connected Gemini and if it is able to communicate, it will be listed in the status window and
automatically go online after five seconds.
Page 26
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 26 © Tritech International Ltd.
5. Gemini Software Operation
Note
To access the online help hover the mouse pointer over a control and press the
F1 key.
Note
In order to communicate with a Gemini Imaging Sonar, the Gemini software must
be set to run in Imager mode. This is done by setting the Sonar Type to "Imager"
in the ???.
When the Gemini software is running, it presents a choice of two screens, which are selected
by clicking on the tabs at the top left hand of the screen. The two screens are the User screen
and the Advanced screen. The User screen allows the maximum amount of screen to be
used for data display and the Advanced screen enables adjustment of the sonar settings.
5.1. User Screen
5.1.1. Overview
The 120° cone in the middle of the display shows the sonar image that the Gemini Sonar is
producing. Around this display are the most commonly used controls.
On the upper left hand corner are the controls for starting the sonar imaging, starting the
software logging of the images received from the sonar, replaying previously logged data,
and capturing images.
On the upper right hand corner are the controls for orienting the displayed sonar image,
controlling the zoom window, selecting the post processing filtering to be applied to the image,
and the sound velocity indicator.
In the middle of the left hand side of the screen is the palette selector.
Page 27
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 27 © Tritech International Ltd.
On the lower left hand side of the screen are the range and gain controls for the sonar.
On the lower right hand side of the screen are the indicators showing the pointer position
within the display area.
Note
If serial sensor data is available and enabled from the Advanced tab, a subset
of the data will be shown at the bottom of the User screen as well.
5.1.2. Online Button
The Online button starts communication with the Gemini head. When the
software is started the head will not be running and the Online button will
be grey.
Clicking the Online button will start the Gemini head; the button and the sonar
cone image next to it will change to green. Clicking the button a second time
will stop communication with the head, and the button and sonar cone will
return to grey.
If the Online button is pressed while no heads are visible to the Gemini software, the
following message will be displayed.
Clicking OK will acknowledge the message, and the software will not go online.
If the Sonar ID entered in the Sonar box of the configuration settings is not one of the heads
visible to the Gemini software when the Online button is pressed, the software will present
one of two messages.
If only one head is visible, the software will offer the chance to start imaging from that head.
Clicking Yes will cause the software to select the head which is visible to it. Clicking No will
acknowledge the message, and the software will not change the selected head and will not
go online.
If there are multiple heads that are available, the software will display a message asking you
to change the Sonar ID to one of the detected units.
Page 28
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 28 © Tritech International Ltd.
If the head is not able to connect due to being on a different network or having different
network settings the following will be displayed:
Note
To correctly set up the network refer to Appendix B, Setting the computer IP
address in Windows 7 (or Appendix A, Setting the computer IP address in
Windows XP) and Appendix C, Setting the Gemini Device IP Address in Gemini
Software.
5.1.3. Record Button
The Record Button controls the recording of the image being displayed by
the software. When the button is clicked the software will start recording data
and the button will be highlighted. Recording can be stopped by clicking on
the button again.
The Log Directory selector controls which directory the data is recorded in. The directory
displayed in the Log Directory selector is the root directory where all recorded data will
be stored. Below that, a directory will be created using the current date, and each log data
filename will include the time when recording started.
The software has a maximum file size for the logged data files. Once this size has been
reached, the software will stop logging to the current file and open a new file to resume
logging. The name of the new file will be based on the time the file was opened. If data is
logged for a significant period of time, a number of files will be created, each with a different
filename indicating when the data was first logged to that file.
For example, if the Log Directory selector is showing that the directory selected is
C:\GeminiData, and recording was started at 4:30:02pm on 18th of October 2014, the
data would be recorded in the file 163002_IMG.ECD in the directory C:\GeminiData
\LD20141018.
The software will automatically create any directories needed for recording.
5.1.4. Player Controls
The player controls manage the replay of Gemini data previously recorded by the software.
Page 29
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 29 © Tritech International Ltd.
From left to right they are Play, Stop, Repeat and Load. The controls that are enabled will
depend on what the software is doing, for example, it is not possible to do anything with the
player controls whilst the software is acquiring data from the Gemini head, nor is it possible
to open a file whilst another file is already playing.
Play Button
The Play button is a play/pause control for the file player. When the data from
a file is loaded but not playing, the image is a green triangle.
Clicking the image will start the file playing and the image will change to a
Pause control (two vertical lines).
Clicking the image again will pause the file replay and the image will change back to the Play
control (triangle).
Stop Button
The Stop button stops file replay and resets the play progress to the start.
Repeat Button
If the Repeat button is active and the player reaches the end of the file it is
playing, it will return to the start of the file and continue. Clicking the Repeat
button will alternate between the repeat being active and inactive.
Load Button
When the Load button is pressed, the software will open a file selector to allow
the user to select a previously recorded data file to be replayed. To replay the
data recorded at 4:30:02pm on 18th October 2014, file selector would look like
this and the file 163002_IMG.ecd should be selected.
Multiple files may be selected in the file selection dialogue. The software will attempt to replay
the log files in sequential order according to filename. Replay order is not guaranteed if the
selected files are from different dates.
When replaying a log file, the filename, together with the date and time of recording, will be
displayed at the bottom of the screen (below the Gemini data) in green text, for example:
Page 30
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 30 © Tritech International Ltd.
Frame Number and Speed Control
The Frame control is a slider bar which allows the user to move quickly around the file that
has been loaded. The number at the right hand end is the currently displayed frame number
from the file. The slider can be grabbed to move quickly to any position in the file, whilst the
two arrows at the end of the slider can be used to precisely position the frame being displayed
in the file. The frame number can be used changed whilst the file is playing or paused. This
control only appears when a file has been loaded.
The Speed control changes the replay speed of the data being replayed by the software.
The maximum speed is 5 x (500% as indicated by the number at the right hand end of the
slider bar). The slider can be grabbed to change the replay speed quickly, whilst the two
arrows at the end of the slider can used to precisely control the replay speed. The replay
speed can be changed whilst the file is playing or paused. This control only appears when
a file has been loaded.
5.1.5. Capture Screen
When clicked, the Capture Screen button will take a screenshot of
the Gemini data view and write it to an image file. This image is stored
in the Images subdirectory of the log data directory, with a filename of
Gemini_YYYY-MM-DD-HHmmSS.xxx, where:
• YYYY: Year
• MM: Month
• DD: Day
• HH: Hour
• mm: Minutes
• SS: Seconds
• xxx: Image file format. See Section 5.2.3, “Application Settings” for the
capture format and resolution options.
For example, using a logging directory of C:\GeminiData, the first image captured would
be stored in the file C:\GeminiData\Images\Gemini_2016-05-12-111555.jpg.
When the image has been captured, the Gemini software will display a message (as below)
giving the name of the file. This message will be displayed for five seconds and then will
close automatically.
Page 31
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 31 © Tritech International Ltd.
5.1.6. Record Video
The Record Video button is used to capture replayed Gemini data as a video
file. Video capture is only available when a file is being replayed and cannot
be performed on live Gemini data.
When a file has been loaded and the playback of the file has been paused or stopped, the
Record Video button will be enabled. When the Record Video button is clicked, the video
capture process will take over the replaying of the data. The video capture process is ended
when the Record Video button is clicked for a second time.
The frame counter will be visible during recording as the user may select which part of the
log file they would like to capture. The video file will be captured so that the replay will occur
at approximately real time and it is not possible to change the speed of the playback during
recording.
The generated file is stored in the Images sub-directory of the log data directory with a
filename of Gemini_YYYY-MM-DD-HHmmSS.xxx, where:
• YYYY: Year
• MM: Month
• DD: Day
• HH: Hour
• mm: Minutes
• SS: Seconds
• xxx: Video file format. See Section 5.2.3, “Application Settings” for the video format and
resolution options.
When the video file has been captured, the Gemini software will display a message (as below)
giving the name of the file. This message will be displayed for five seconds and then will
close automatically.
5.1.7. Invert Display (Up/Down)
The Invert Display (Up/Down) button is used to vertically invert the image
displayed by the software.
5.1.8. Flip Image (Left/Right)
If the sonar is mounted upside down, the software has the ability to flip the
image from left to right as viewed on the computer screen so that the image
still appears correctly oriented to the user. The illustration above shows the
button in the non-flipped state.
Page 32
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 32 © Tritech International Ltd.
5.1.9. Draw Grid
The Draw Grid button, when clicked, draws the range and bearing grid on the
displayed Gemini data. The illustration above shows the button in the on state.
5.1.10. Zoom Button
When the Zoom button is clicked, a zoom window opens which shows the
data around the mouse pointer in more detail, as the following image shows.
Zoom box example with Gemini Sonar data
If the Gemini unit has CHIRP enabled, the zoom window will show Acoustic Zoom data.
Acoustic Zoom data is additional data collected by the Gemini unit for the highlighted area,
allowing a more detailed view without loss of resolution. If data is being recorded when this
button is enabled, the Acoustic Zoom data will also be recorded in addition to the normal
view data.
If the Gemini unit does not have CHIRP enabled, the zoom window will show Digital Zoom
data. This data is simply a magnified view of the data present on the normal view.
The zoom window positions itself to either the left hand side or the right hand side of the
screen so that it does not obscure the Gemini data. The magnification level of the window
is changed by using the mouse wheel, or by using the + and – buttons next to the zoom
button. The magnification level can be changed between 1.5x (minimum magnification)and
40x (maximum magnification).
Clicking within the Gemini data arc will lock the zoom at that point. Clicking outside of the arc
will release the lock and the zoomed area will follow the mouse pointer.
5.1.11. Filter Selector
The Gemini software allows three filters to be applied to the image after it has been received
from the Gemini Sonar and also to replayed data. From left to right, they are None, Average,
Persistence, and Movement.
There are controls on the advanced screen to change the setting for each of the filters and
they are described in more detail in Section 5.2.4, “Filter Settings”.
Page 33
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 33 © Tritech International Ltd.
5.1.12. Sound Velocity Indicator
The sound velocity indicator at the upper right hand side of the display shows the sound
velocity used by the Gemini Sonar whilst producing the sonar image. The Gemini Sonar can
use a fixed value for the sound velocity or an automatically measured velocity.
5.1.13. Palette Selector
The Gemini software is supplied with a number of palettes which are used to show the
different intensities in the sonar image in different colours. The palette bar on the left hand
side of the screen shows the mapping currently being used.
Clicking on the palette bar opens a palette selector which allows the selection of the palette
to use. As the mouse is hovered over the different palettes, the sonar image will preview
that palette.
5.1.14. Gain Assist
By default this is turned on as indicated by green text. When turned on the Gemini will
automatically reduce a high gain setting on range lines where bright targets are observed.
This improves the clarity of the target, but can give the effect of dark bands in the background
image. When turned off the Gemini will always use the gain slider setting. If bright targets are
observed and a high gain setting is used, the target will appear to spread out in the displayed
image.
Note
The Gain Assist setting can be changed during operating the Gemini live and
when replaying logged data but cannot be changed for log files created with
software versions prior to 1.16.0 for which it will always be turned ON.
5.1.15. Gain Control
Page 34
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 34 © Tritech International Ltd.
The Gain slider at the bottom left hand side of the display is used to change the gain level
being used by the Gemini head, and is expressed as a percentage between 0 (no gain being
applied) and 100 (full gain being applied).
The gain can be changed by either clicking on the dark blue indicator showing the current gain
position in the slider and dragging it left or right, or by using the arrows at the end to change
the gain one step at a time. The arrows are designed for fine control of the gain and operate
one step per click and clicking on the arrows and holding them down will have no effect.
The gain can also be altered using keyboard shortcuts ('z' to decrease gain, 'a' to increase
gain).
5.1.16. Range Control
The Range slider at the bottom left hand side of the display is used to change to the range
of the image being acquired by the Gemini head.
The range can be changed by either clicking on the dark blue indicator showing the current
range position in the slider and dragging it left or right, or by using the arrows at the end to
change the range one step at a time. The arrows are designed for fine control of the range
and operate one step per click and clicking on the arrows and holding them down will have no
effect. The range control has been implemented with a logarithmic scale so that the smaller
values of range can be more precisely selected.
The range can also be altered using keyboard shortcuts ('c' to decrease range, 'd' to increase
range).
5.1.17. Indicators
When the mouse pointer is within the ‘cone’ on the sonar display (that is over the displayed
sonar image), the indicators at the bottom right hand side of the screen will show the position
of the mouse pointer relative to the origin of the display (that is relative to the Gemini Sonar).
The pointer position is expressed as a range / bearing pair, and as a Cartesian co-ordinate
(X, Y).
5.1.18. Measurements
When the mouse pointer is within the cone on the Gemini data display measurements can
be taken from the display. A single click on the cone will show the position of the click.
Clicking at one point on the cone and holding the left mouse button down whilst moving the
mouse will give a measurement between the two points.
Page 35
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 35 © Tritech International Ltd.
When any measurement has been taken, clicking outside the cone will turn the measurement
off.
5.1.19. Warnings
Out of water
If the Gemini detects that it is not immersed in water, the warning “Out of water” will be
displayed in the centre of the scan image:
The sonar will continue to operate at full power during a 20 minute countdown period. During
the countdown period, toggling the Online button will reset the timer back to the start or
immersing the sonar back into water will clear the warning.
At the end of this period the sonar will enter a power saving mode to reduce the heat build
up within the unit. The software will still display information about the sonar during this power
saving mode, but the sonar will not re-enable it's ability to transmit until the Online button
has been toggled off then on.
Over temperature
If the temperature sensors within the sonar detect that the internal temperature is too high
an "Over temperature" warning will be displayed.
The sonar will enter a power saving mode and only basic communication with the unit will
be possible. Cooling the unit and then toggling the Online button will clear the warning and
resume the full capabilities of the sonar.
Page 36
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 36 © Tritech International Ltd.
5.2. Advanced Screen
The Advanced screen is accessed by clicking the Advanced tab at the upper left hand
corner of the screen.
The Advanced screen shows more details about the Gemini system, and allows certain
options in the software to be configured. The screen is split into three areas: the User
area, which has been previously described in Section 5.1.1, “Overview”; the lower left are of
the screen contains the System Data tabs; and the Advanced Settings panel, which
contains the majority of the configurable settings for the software.
5.2.1. System Data
The first line on the screen gives the versions of the elements which make up the Gemini
software and the other lines show status information from the Gemini Sonar (or Sonars)
connected to the system. More than one Gemini Sonar can be communicating at any one
time and the Gemini software will display the images from up to a maximum of four of the
sonars.
If more than one Gemini Sonar is connected and powered, its details will appear on the
System Data screen. The currently active sonar will have green text and the dormant sonar(s)
will be in yellow.
For a multiple sonar setup the arrows allow the list of sonars to be scrolled.
Page 37
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 37 © Tritech International Ltd.
5.2.2. Configuration Options
The Configuration Options allow the user to select which Gemini Sonar to use, select
the Sound Velocity to be used during image processing, modify sonar data rates, and finally
to change the network settings.
Note
In order to communicate with a Gemini Imaging sonar the software must be
set to run in Imager mode. This is done by setting the Sonar Type to “Imager”.
When changing this setting, the user will be prompted to allow the software to
restart. Once the software restarts, all Imager settings and relevant options will
be available.
Sonar Selection
The Sonar ID of the Gemini Sonar is used to determine which sonar will be used as the source
of images displayed by the software. The Sonar ID is available on the system data area of the
Advanced screen, and should be entered in the Sonar box. The number of sonars can also
be selected (up to 4) and each can have an ID. If multiple sonars are present the ID selection
field will change to allow the sonar to be positioned on the display with an offset and rotation.
The Gemini software will retrieve the IP address and Subnet Mask for the chosen Gemini
Sonar (if the sonar is visible to it) and use them to communicate with the Sonar.
Note
If the sonar is operating and Online has been selected then it will not be
possible to change the ID until the sonar is taken off-line.
Sound Velocity
The Sound Velocity controls are used to set how the Gemini obtains the sound velocity
which is used in producing the sonar image. The Gemini can either use a fixed sound velocity
(in which case the sound velocity to be used is entered in the Fixed Velocity box below
the sound velocity selector), or use a measured sound velocity.
Page 38
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 38 © Tritech International Ltd.
The above example shows the fixed sound velocity selected with a value of 1499.2m·s-1. The
software will round the value entered to a predetermined increment (3.2 m·s-1 or 10.5 ft·s-1)
which will be displayed on the Sound Velocity display on the User screen.
When entering a fixed sound velocity, the software will verify the value is within the range
1400m·s-1 to 1588m·s-1. If not, a warning is displayed to the user and a default value of
1499.2m·s-1 is used.
Compression
Run Length Encoding (RLE) is a technique that is used to compress the image data as
it is transferred between the Gemini head and the software, thus reducing the required
bandwidth. RLE in Gemini is a lossy compression technique where all sonar data below a
determined level is set to zero before compression is applied. Increasing the compression
level will increase the efficiency of the compression and effectively reduce the bandwidth
required to transmit the image data. The consequence is that weaker returns are filtered out
of the sonar image. This will initially reduce potential noise but will start to remove smaller/
weaker targets from the image.
The Enable Compression button toggles the compression when clicked (black
background to the button means compression is off, blue background means compression
is on). The Compression control sets the level applied by the run length encoding; returns
below this intensity percentage will be set to zero. The live image displayed by the Gemini
software immediately shows the effect of the compression.
The live image displayed by the Gemini software shows the effect of the compression
immediately.
Example screenshot of sonar imagery with no compression.
Page 39
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 39 © Tritech International Ltd.
Example screenshot of sonar imagery with a 25% compression level.
Note
Compression is applied before the software receives the sonar data and
therefore compression cannot be applied to data that has already been recorded.
Conversely, recorded data that has been compressed cannot be uncompressed.
Acquisition Speed
Acquisition speed is another mechanism available for reducing the sonar data rate and
required bandwidth. When the Half Speed Acquisition button is enabled (blue
background) the software will reduce the sonar image acquisition speed to approximately
half the maximum rate.
Note
Reducing the acquisition speed can also be useful if acoustic multipath is causing
false moving/transient targets to be observed in the sonar image.
Serial Inputs
Data from external serial sensors can input to the software via a Gemini Hub or the computer
COM Ports. These options can be enabled/disabled using the provided drop-down menus.
See Section 5.3, “Serial Data Input” for a detailed description of the related settings and
options.
Reset to Defaults
The Reset to Defaults button, when pressed, returns the software settings to their default
values.
Page 40
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 40 © Tritech International Ltd.
5.2.3. Application Settings
Units
The Units control selects between Metric and Imperial units. The selected unit type is then
used throughout the program to display measured values. For example, a Sound Velocity
displays as 1499.2m·s-1 using Metric and 4918.64 ft·s-1 with Imperial.
Measurement
The Measurement control selects between Measurement Tool annotation options that
display distance in the Gemini data view. The user may select the measurement to be shown
in polar coordinates, Cartesian coordinates, or no annotation displayed. For more information
on the Measurement Tool see Section 5.1.18, “Measurements”.
Logging Directories
The Primary logging directory selector indicates the write location for all data logging,
including screenshot captures and video (see Section 5.1.5, “Capture Screen” and
Section 5.1.6, “Record Video” for capture examples).
The Secondary logging directory selector allows the user to specify a second directory in
which Gemini log data will be written to. For example, this may be used to write to a backup
location. If both Primary and Secondary directories are specified a recorded log file will
be written to both directories.
Click the directory control (i.e. the box containing C:\GeminiData) in order to open the
Browse for Folder dialogue. Use the navigation tree to select the desired directory and then
press OK. The Cancel button closes the dialogue and does not change the logging directory.
Page 41
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 41 © Tritech International Ltd.
Enable Auto Logging
This option will enable the Gemini software to start logging data immediately upon start up
and when the software goes online, without any additional user intervention. It will use the
Primary and Secondary locations for storage and use the ECD file format for storage.
Resolution
The Resolution dropdown menu provides options for screenshot and video capture
resolution. This can be used to increase or decrease the image/video size (width x height)
as well as the quality.
The list contains the following options: commonly used screen resolutions (i.e. 1920x1080)
and a Screen (x) option, which is the current monitor resolution.
Note
Recording large videos may fail on systems with insufficient memory. If videos
are not written correctly or have no frames then decrease the resolution before
recording. Additionally, AVI videos are less memory intensive and may work
better for larger resolutions.
Capture Format
The user may specify a standard image file format which is used when saving a captured
screenshot. Options provided include: BMP, GIF, JPG, and PNG.
Video Format
The user may specify a standard video file format which is used when saving a recorded
video. Options provided include: AVI and WMV.
Page 42
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 42 © Tritech International Ltd.
Reset to Defaults
Pressing the Reset to Defaults button returns the software settings to the default values.
Caution should be taken as this will overwrite all user settings changes.
5.2.4. Filter Settings
The Filter Selector on the User screen selects one of three filters to be applied to the
image before it is displayed. The Filter Setting section of the Configuration Options screen
allows the settings of these three filters to be changed. The Filter Settings panel provide
three different data filters that may be applied to the sonar image before it is displayed. The
filters are only active if enabled in the sonar view (See Section 5.1.11, “Filter Selector”).
The Averaging filter applies an average over a number of images received from the sonar.
It has the effect of removing random noise and rapidly moving targets from the image.
The Persistence filter retains decreasing amounts of earlier images as well as the current
image. It has the effect of highlighting movement in the images, which appears as a decaying
“snail trail” behind the moving object.
The Movement filter highlights the changes between images and filters out static returns.
The Movement control sets how much background (i.e. non-moving data) is removed from
the image. With the Movement control set at maximum, the movement filter removes all of
the background and so the display only shows targets that are moving between images. With
the Movement control set at minimum, the movement filter retains almost all the background
(and becomes almost indistinguishable from the Persistence filter).
Page 43
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 43 © Tritech International Ltd.
5.2.5. Device Network Settings
VDSL Settings
The VDSL Settings drop-down allows three different settings to be applied to the VDSL
link in order to cope with different levels of electrical noise experienced by the sonar cable.
Note
Only if difficulties are being experienced communicating with the Gemini head
should the VDSL settings be changed from Normal to one of the other values.
Appendix C, Setting the Gemini Device IP Address in Gemini Software describes how the
Gemini network settings can be altered to allow it to work with a desired network. Once the
head has been successfully configured it should not be necessary to change the settings
again unless moving to a different infrastructure.
5.2.6. Distance Marker
The Distance Marker provides a mechanism for measuring the distance between two
points in the Gemini data view. This is similar to the Measurement Tool but provides
additional options that allow it to be used as a more permanent measurement.
Enable the feature by clicking the Enable Distance Marker button. This will draw the
Distance Marker as a horizontal line and the Set Point as a small circle in the Gemini
data view.
For both the Distance Marker and Set Point, the corresponding colour selector may
be used to distinguish the markers from the head image. Click on each colour box to open a
Page 44
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 44 © Tritech International Ltd.
colour selection dialogue. Additionally, for each marker, the Cartesian coordinate is displayed
in the Distance Marker panel. The Distance Marker line width can be set by entering a
value into the Marker Width field.
In the Gemini data view, each marker can be clicked and dragged to a new position. The
distance measurement will continuously update and reflect the distance between the two
markers.
Note
In order to click and drag the markers the click must be within the head image.
For example, if a marker is at location (0, 0) the clickable area is fairly small and
care must be taken to click the correct area. In this case, the Distance Marker
line may reach past the head image boundary and would only be clickable where
it overlaps the head image.
The distance between the Distance Marker and Set Point is displayed in the bottom
right of the Gemini data view (see image below). The displayed values are calculated as:
Distance (X, Y) = (Distance Marker - Set Point)
The Distance Marker range/ Y coordinate may be updated from an external sensor. Enabling
the Distance Range from Sensor button will update the value whenever a configured
sensor message is received. See Appendix E, Gemini Software String Decode for the
appropriate Marker Range decode options.
5.2.7. Target Tracking
Target Tracking provides a mechanism of highlighting objects and following their
movement over subsequent sonar frames. Once enabled, targets will be automatically
determined and tracked when selected. There are two main methods of target tracking
available within the Gemini software:
Page 45
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 45 © Tritech International Ltd.
1. Click + Track
2. Detect + Track
Note
Although both options will only be displayed, the Detect + Track option will
only be available for selection if a Gemini 720is has been detected.
The Target Tracking method can be selected using the drop down selection on the
Tracking Mode box.
Click + Track
In order to track a single target, the Track Single Target option can be selected from
the Targets menu. This restricts the user to select one target at a time and has the benefit of
displaying the target position. As the target is tracked the Range/Bearing and X/Y Position
will be updated from each sonar frame.
The Track Multiple Targets option can be used to select and follow multiple targets.
Each right-click will attempt to find a target and track it separately. No position information is
displayed when tracking multiple targets. If the user changes from Multiple to Single tracking,
the target closest to the sonar will be used.
Page 46
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 46 © Tritech International Ltd.
The Reset Targets button will clear all selected targets. This is useful when an incorrect
target has been selected or the user wants to track a new target.
Note
Noisy conditions may lead to inconsistent target recognition and tracking.
Targets that overlap with other objects or sections of visible seabed may result
in large targets that encompass more than the desired target. Ideally, a target
will have a high contrast to its surroundings.
Detect + Track
In order to track objects effectively, the various settings need to be optimised.
Target Size
This is the estimated size of target that is to be tracked.
Maximum Targets
This sets an upper limit of the number of targets that will be considered for tracking. Setting
this to a large number will increase the load on the computer CPU and may cause the Gemini
software to slow down.
Page 47
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 47 © Tritech International Ltd.
Active Range Window and Active Bearing Window
These settings set up a mask around a tracked target. As long as the target moves within
the mask from one instance to the next the target will remain tracked. If the target moves
too quickly tracking will cease.
Sensitivity
Increasing the sensitivity will allow the tracking to detect more potential objects, but can result
in a greater number of false positives.
The Reset to Defaults button will reset the above settings back to default values. It will
also automatically stop any active tracking.
To track a target, click on the Enable Target Detection button and setup the settings
to suit the current environment.
Once enabled, potential
targets will be highlighted in
the appropriate colour, green
in this instance.
To track one or more targets,
place the mouse cursor over
it and right click on it. A small
cross will appear in each
target selected.
To begin tracking either:
click the Enable Active
Tracking button; or double
right click the last target. The
highlight boxes will change
colour and the other potential
targets will no longer be
highlighted.
The Tracked Targets
information will now update
with details of the primary
target to be tracked. The
primary target is denoted by a
small cross within the highlight
box.
To change the primary target,
right click another highlighted
target. The cross will then
move to the new primary
target.
The Reset Targets button will stop any tracking that is currently taking place.
Page 48
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 48 © Tritech International Ltd.
5.3. Serial Data Input
Data from external serial sensors can be input into the Gemini software and logged as part
of the sonar image record.
To enable data input to the system select Enabled for either (or both) of the COM Ports
or Gemini Hub. The COM Ports drop-down list is for serial ports that are connected to the
computer (either natively or through an RS232 to USB converter) and is also for configuration
of the RS232 functionality of the Gemini Sonar head. The Gemini Hub drop-down list is
only for configuration of connected Gemini Hubs.
Selecting Enabled for either Gemini Hub or COM Ports will alter the tab options in the
bottom left of the screen. If both are disabled there will be no tabs visible and the status area
will only display information about connected Gemini heads.
With Gemini Hub selected.
With COM Ports selected.
With Gemini Hub and COM Ports selected.
5.3.1. Sonars & Sensors
The Sonars tab is for displaying information and is the same display as when no tabs are
present (for a full description see Section 5.2.1, “System Data”).
The Sensors tab is for displaying extra information from connected RS232 sensors.
Note
The Settings field of the Sensors tab is only active if logging is taking place.
Within the Settings field the actions of the operator are recorded so that during
play back of the log file it is possible to see which settings have been changed.
Note
If serial sensor data is shown here, a subset of the data will also be shown at
the bottom of the User screen.
Page 49
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 49 © Tritech International Ltd.
5.3.2. Gemini Hub
Hubs Tab
The Hubs tab shows the status information from any connected Gemini Hubs.
Hub Setup Tab
The Hub Setup tab allows configuration of the serial ports on the rear of the Gemini Hub to
allow RS232 data to pass through to the Gemini software from external sensors.
Port The port letter, corresponding to the label on the back of the Gemini
Hub.
Mode Can change between an ASCII decode, binary decode or can echo
the data on one of the other ports (ASCII is the default input, only the
Simrad EM3000 uses a binary input). Echo is used as an alternative to
a serial splitter cable in systems where the sensor data is also used by
another application or device.
Sync The sync character used to frame the ASCII string.
Baud The baud rate of the sensor connected to the port.
Decode The decode definition to apply for the expected receive data on the port.
Max Set the time in seconds to generate an alarm if no data is received.
Age The age of the data, shows when the last good data was received (see
note below).
Hz The incoming data rate
String The incoming data string, check this against the chosen Decode if the
data indicator is red.
Page 50
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 50 © Tritech International Ltd.
Note
The data age status indicator will show the status of each port. A grey indicator
means no data is present, red is for an incorrect data string, yellow indicates an
incomplete data string and green is for normal operation.
5.3.3. COM Ports
The COM Ports enables one extra tab called Serial Setup from where all the ports (both
connected to the PC and ports on the Gemini head) are configured.
COM Port The COM port to use.
... Open the settings dialog for configuring the port baud rate, data bits,
parity and flow control.
Mode Can change between an ASCII or binary decode (ASCII is the default
and binary is only used for the Simrad EM3000).
Sync The sync character used to frame the ASCII string.
Decode The decode definition to apply for the expected receive data on the port.
Max Set the time in seconds to generate an alarm if no data is received.
Age The age of the data, shows when the last good data was received (see
note below).
Hz The incoming data rate
String The incoming data string, check this against the chosen Decode if the
data indicator is red.
Gemini RS232
Ports
The ports on the rear of any connected Gemini heads. This data can be
decoded as per the computer COM ports or the data can be routed as
an output from one of the computer COM ports (if the data is required
on an second computer, for example).
Note
The data age status indicator will show the status of each port. A grey indicator
means no data is present, red is for an incorrect data string, yellow indicates an
incomplete data string and green is for normal operation.
Page 51
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 51 © Tritech International Ltd.
5.4. Multiple Head Operation
Note
The following instructions refer to a Gemini Sonar with a 120° swathe. Other
products within the Gemini range may have differing swathes, but the same basic
principles described apply.
The number of heads connected to a system can be selected using the drop-down list on the
right-hand pane of the Advanced screen.
The first time the number of heads is altered the sonar display will place the sonars side-byside in a line. Any subsequent alterations to the position or rotation of each sonar image is
stored and recalled when the Gemini software is restarted.
The position of the sonar images can be altered using the text fields listed under Choose
and position the sonars. Each text field is editable and allows the sonar scans to be
moved around in relation to a central reference point. The default is as follows:
Example Layout
Changing the position values as follows:
Will arrange the sonar images in a circle:
Page 52
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 52 © Tritech International Ltd.
Note
Turning off the range lines and text can improve the display.
In this case, sonar 1 is looking forward while 2 and 3 are looking aft. There is no overlap and
each sonar is displaying a full 120° arc.
Overlapping sonars is also possible and any images generated will be a combination of
echoes from both heads:
Page 53
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 53 © Tritech International Ltd.
5.5. Offline Mode
If for some reason when the software is started it cannot initialise communications with the
Sonar (for example if another instance of the software already running) the following warning
will be displayed:
The software will then open with a cut down user interface which will allow the replay of data
which have already been recorded, but all the controls associated with the Gemini Sonar
will be removed.
Those controls which are present work in exactly the same way as if communications with
the Gemini Sonar was possible, and as described earlier in this manual.
5.6. Automatic Online
Once the Gemini Sonar and the Gemini software have been configured so that they can
communicate successfully, when the Gemini software is started it will automatically start
imaging as soon as it detects the presence of that Sonar. This allows unattended start up
of the Gemini software and system.
This functionality can be disabled by adding the command line switch /noautoonline to
the command which starts the Gemini software.
5.7. Settings Files
The Gemini software stores all the settings in the file C:\GeminiData\Settings
\Gemini.xml. A backup of this file can be kept as a record of all the Gemini settings. When
contacting Tritech International Ltd Technical Support it may be necessary to supply a copy
of this file.
The Gemini software keeps a historical log of settings files in the folder C:\GeminiData
\Settings, with folder and file names automatically generated from the date and time. This
can be useful for restoration of previously known good settings. To use a previous settings
file:
1. Shut down the Gemini software.
2. Delete (or rename) the C:\GeminiData\Settings\Gemini.xml file.
3. Copy the historical settings (*.xml) file into the location C:\GeminiData\Settings and
rename it to Gemini.xml
4. Start the Gemini software.
A factory settings file is stored in the install folder (normally C:\Program Files\Tritech
\Gemini\Factory.xml). To revert completely to the factory settings file:
Page 54
Gemini Software Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 54 © Tritech International Ltd.
1. Shut down the Gemini software.
2. Delete (or rename) the C:\GeminiData\Settings\Gemini.xml file.
3. Copy the Factory.xml file into the location C:\GeminiData\Settings and rename
it to Gemini.xml
4. Start the Gemini software.
5.8. Keyboard Shortcuts
A number of keyboard shortcuts are available for commonly used activities.
F7 Toggle Logging of data
Ctrl F Capture the screen to file
A Increase gain
Z Decrease gain
D Increase range
C Decrease range
Page 55
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 55 © Tritech International Ltd.
6. Seanet Pro Installation
The Seanet Pro Windows software will be provided either on an Installation CD-ROM or preinstalled on a Seanet SCU. For the CD-ROM Installation, if Setup does not auto-run on disc
insertion, run the SETUP.EXE file from the disc to start the installation and follow on-screen
instructions. Details for installing or re-installing software can be found in the System section
of the Seanet manual.
The first step is to ensure connection to the sonar is possible by changing the sonar and
computer IP addresses so that the Ethernet link can work (since VDSL connections are
bridged to Ethernet this also applies if using the sonar in VDSL mode).
Note
For instructions on setting the computer and sonar head IP address please refer
to Appendix A, Setting the computer IP address in Windows XP and Appendix D,
Setting the Gemini Head IP Address in Seanet Pro
The final check to see if the correct changes have been made to the Gemini Sonar is to run
Seanet Setup from the desktop icon to display the Node table. If the change of the sonar’s
IP address has been successful, the sonar should be listed in the node window.
Note
In order to correctly run the Gemini head on a SCU it will need to be upgraded
to the V5 specification. Contact Tritech International Ltd for more details of the
SCUv5.
Page 56
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 56 © Tritech International Ltd.
7. Seanet Pro Operation
Note
This section details the aspects of Seanet Pro that are specific to the Gemini
Sonar. For more general information (particularly if integrating with other
devices) please see the Seanet Pro Software Manual which is available online
at
www.tritech.co.uk
Before starting operations, run Seanet Setup to verify that the Gemini LAN is enabled and
any connected devices, including the Gemini sonar, are detected. In Seanet Pro, the Gemini
Sonar has been allocated the node range from 100 to 103.
7.1. Seanet Setup for Gemini
Click on Gemini LAN from the Setup menu.
Figure 7.1.
This will open the Gemini Setup page.
Figure 7.2.
Gemini Setup
Network Enabled Ensure this box is ticked to load the Gemini Connection
DLL and start the Gemini Network. The box can remain
permanently ticked thereafter.
Number of Sonars Detected When the network is enabled, this will display the
number of Gemini Sonars that are currently detected and
broadcasting on the network.
Selected Sonar The drop-down list will display the ID Numbers of all the
Gemini Sonars currently connected. Select the Gemini
Sonar that you wish to configure.
Selected Sonar Details When the selected item in the ‘Selected Sonar’ drop-
down list is changed, the details of that particular Gemini
Sonar will be displayed here. These details include;
Page 57
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 57 © Tritech International Ltd.
unique Sonar ID, Firmware Version, broadcasting Sonar
IP Address and Subnet Mask.
Modify Network Address The Sonar IP Address and Subnet Mask should be in
the same range as the Computer IP Address and Subnet
settings. To program a different Sonar IP Address and/or
Subnet Mask into the selected Gemini Sonar, change the
values in this panel and then click ‘OK’ on the main form
to upload these changes into the Sonar.
Once the Gemini LAN is enabled and a Gemini Sonar connected and displayed in the Seanet
Setup Node Table click on Setup in the Action column to open the Gemini Cfg Setup
dialog.
Figure 7.3.
Gemini Cfg Setup
Velocimeter Mode Set to 'Auto' to apply the in-built velocimeter speed of sound
calculation to the sonar data. Set to 'Manual' to revert to a fixed
speed of sound. This fixed speed of sound is the manual V.O.S.
(Velocity Of Sound) setting configured in the Environment dialog
from within Seanet Pro.
Ping Setup The two modes of operation are Triggered and Continuous.
In Triggered mode the Gemini will be sent continual triggers
where one trigger will instruct the Gemini to ping once. Each time
Seanet receives data for the current scan, it will respond and send
the next trigger to the Gemini to instruct it to perform the next ping.
This turnaround is half duplex in nature. In Continuous mode,
Seanet Pro sends one command at start-up which instructs the
Gemini Sonar to ping continuously. For both modes an inter-ping
time delay is also sent to the Sonar to control the scan update rate.
This InterPing Period is set in the Setup dialog accessed
through the Tools menu in Seanet Pro.
VDSL Rate Adaption The Seanet Pro software allows three different settings to be
applied to the VDSL link, to cope with different levels of electrical
noise experienced by the cable to the Sonar. The dropdown menu
allows selection of ‘Normal’, ‘Medium Noise’ and ‘High Noise’.
Note
Only change VDSL Rate Adaption if difficulties are being experienced
communicating with the Gemini Sonar. Whenever a Medium Noise or
High Noise setting is selected, on initial startup of the Gemini, the VDSL
communications will take several seconds to find it’s optimum rate. During this
period of rate adaption, the top-left of the Sonar screen will indicate the status
text Acquiring… (in red text).
Page 58
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 58 © Tritech International Ltd.
7.2. Gemini Sonar Application
Note
Refer to the Seanet Pro Software Manual manual for a comprehensive
description of the menu bar, buttons, status bar and general features. This
section shows only those specific to the Gemini Sonar Application.
The Gemini Sonar display is very similar to the standard Sonar display used for Tritech
International Ltd mechanical sonar heads such as SeaKing and SeaPrince. However, the
Gemini Sonar has a fixed scan sector of 120° and unlike the mechanical heads does not
have option for scan sector size and position adjustments. Therefore these function controls
have been omitted from the settings bar.
Note
If a Gemini Narrow Beam Imager is connected then the scan size will
automatically update to 130°.
7.2.1. Sonar Settings
The Gain, Contrast and Range controls relate to C1 – C3 respectively on a Remote Access
Terminal (RAT). Function buttons F1 & F2 will become active whenever a multi-device or
multi-window application is selected from the Applications menu. These controls will
cycle through and maximise the device windows.
Page 59
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 59 © Tritech International Ltd.
1. Application Tools Clicking on the tools icon on the left of the Sonar Settings Bar will
open the Application Tools menu
2. Application On, Off, Pause This doubles as a pause button and a status indicator.
Clicking on the button will pause the signals from sonar to Seanet Pro and pause the
screen from refreshing. Green indicates normal operation, red indicates the sonar is
paused and yellow shows sonar data from a log replay.
3. Sonar Gain (RAT: C1) sets the sonar receive gain as required – typically this is around
20% - 50% but is varied according to water and target conditions and user preference.
4. Range (C3) sets the maximum range the sonar will scan. Long ranges are scanned more
slowly than short ranges due to the limit imposed by the velocity of sound in water.
5. Scanned Area Indicator indicates, in the colour red, the size and position of the scan
sector. This control will always indicate a fixed, forward 120° sector for the Gemini Sonar
(or 130° for Gemini Narrow Beam Imager).
6. Sonar Tx Frequency This is acoustic Transmit Frequency of the currently connected
Gemini Sonar.
7. Selected Sonar Use this option to select the sonar ID to display on the main screen,
the drop-down list will display the ID of all the Gemini sonars currently connected.
7.2.2. Application Tools
Click on the Tools icon on the left of the Sonar Settings Bar to open the popup menu which
includes all the Application Tools for the Gemini Sonar.
Note
The popup menu can also be accessed by a right mouse button click on the
Sonar display.
Cursor
Adds the cursor position panel to the sonar display.
Figure 7.4.
The Polar check box changes the output display co-ordinates from Polar (Range & Bearing)
format if enabled to Cartesian (X, Y) format if unchecked.
Page 60
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 60 © Tritech International Ltd.
Markers
Figure 7.5.
Adds A and B markers onto the sonar display, the range and bearing to each marker &
separation and relative bearing are shown.
Click on the symbol to deploy on the Marker panel and that marker symbol will be dropped
at the Origin (0, 0) on the Sonar display. Then, pick up the Marker using the left mouse button
and drag it to the position required.
Figure 7.6.
When both markers are dropped on the display, a line will be drawn which connects them.
The ‘Delta’ Range and Bearing at the bottom of the panel indicates separation and angle
between both Markers.
There are 4 sets of Markers that can be implemented; A-B, C-D, E-F, G-H. The operation of
each set is the same as A-B described above.
Display
Figure 7.7.
Sets up sonar display options.
DispMax – Tick to expand sonar display vertically to fit window. If un-ticked will expand
horizontally.
RngLab – Switch the Range Labels On / Off.
Rng Cross, Rings On, Rings, Grid On - Display Grid line options.
Page 61
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 61 © Tritech International Ltd.
Sector On, Sector – Display a Sector overlay with left and right angular limit adjustment (in
degrees).
Rotation – Rotational offset to correct Sonar heading – (Disabled for Gemini Sonar).
Installation
Figure 7.8.
This configures the location of the Sonar in the real world and enables the Geo-referencing
of sonar targets on the sonar display.
From Fixed Position If there is no GPS input, select this option and input the Sonar
position in Latitude and Longitude co-ordinates (DegMin or
DegMinSec format). A Heading input will also be applied, else a
zero degree heading is applied. If present it is also possible to
set the fixed position from the USBL or GPS input so that they
can be disconnected and the position will remain persistent –
simply click the appropriate button “Set Fixed from GPS” or “Set
Fixed From USBL”
From GPS Position
Updates
If a GPS input is active, select this option. A Heading input will
also need to be active for the Geo-referencing to be functional.
From USBL Position
Updates
If a USBL input is active, select this option. A Heading input will
also need to be active for the Geo-referencing to be functional.
From Marker Positions This function requires an application with Sonar
and Nav displays loaded (e.g., by selecting
Settings→Applications→Sonar Nav). The chart of the
Nav display is used to obtain the Marker position references to
be used in this function. If a Nav chart is not used then the Marker
positions must be manually entered in the Sonar display.
Offset (GPS RX to
Sonar)
X and Y position offsets should be entered if there is any offset
between GPS receiver and Sonar (e.g. for a ship hull mounted
system). Or, for an ROV mounted sonar, if the GPS position
updates are the position of a sub/vehicle then this offset may
apply for the separation between a beacon/transponder and the
sonar.
Page 62
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 62 © Tritech International Ltd.
Heading Use this option to select the source of the heading data. If using
a sonar which contains an internal heading and compass device
or if the compass is connected to the Aux port of the sonar
select Internal/Aux Compass. If the compass device has been
connected through a COM port on the SCU or PC, or if a USBL
system is in use then select Ship/USBL Compass. If the sonar
is mounted to an ROV and both the ROV and support vessel
have a compass it is possible to switch to the ROV compass by
selecting Sub/ROV Compass.
Once position and heading data are present, the Cursor display will be extended to provide
position co-ordinates when the mouse cursor is moved around the sonar plotter.
Note
There must be active sonar data, as well as position and heading data, for the
position co-ordinates to be reported.
Aux Compass
Selecting Aux Compass will place a compass and pitch/roll display on the sonar screen. The
data which is displayed is taken from the device selected in the Installation dialog.
Figure 7.9.
Note
The compass and pitch/roll display are never displayed side-by-side as shown
here, their position is at the top/bottom right of the screen by default but can be
changed using the Compass Settings dialog.
Compass Settings
Figure 7.10.
Page 63
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 63 © Tritech International Ltd.
The Compass Settings dialog allows configuration of the compass and pitch/roll sensor
display on the main screen. The position can be selected only if Auto Positioning is first
de-selected. Also colour and opacity can be controlled through this dialog.
If more than one sensor is available for selection this should be performed in the
Installation dialog.
If an offset is required it can be entered here and the compass can be corrected for
displacement of magnetic against True North.
Setup
Sets various Gemini Sonar head options for the currently selected Sonar ID.
InterPing Period This sets the time delay between successive Sonar pings.
The ‘Max Rate’ will set the Sonar update rate to fastest
achievable (up to 15Hz). Range, plot size and PC CPU
specification will limit the maximum achievable rate.
Range Units Select the display range units. Options are Metres, Feet,
Fathoms, and Yards.
Link Type This indicates the current type of communications link
between the Gemini and surface. This can be either direct
Ethernet or VDSL.
Link Speed This is the Uplink transmission speed for the active Link Type.
For Ethernet this will be either 10Mbit·s-1 or 100Mbit·s-1. For
VDSL this will be a rate that may be adapted according to
the VDSL Rate Adaption setting – for the ‘Normal’ setting, the
optimal Link Speed will be applied.
Packet/Dropped/Resent This indicates, respectively, the Number of Packets
transmitted from the Gemini, the Number of Dropped/lost
Packets and the Number of Packet Resends attempted.
No. Sample Bins This is the Number of Samples over the current Range scale.
Inverted Head If the Gemini Sonar is mounted upside down (that is the sonar
is positioned with the transmitter on the top rather than the
design orientation with the transmitter at the bottom), ticking
this box will flip the image from left to right, as viewed on
the computer screen, so that the image still appears correctly
oriented to the user.
Flipped Head This is used when the Gemini sonar is mounted with the
transducer pointing aft instead of forward
Velocity of Sound
This panel displays the Velocity of Sound value being used by the Gemini Sonar. The Gemini
is fitted with a Velocimeter which can be enabled/disabled in the Gemini Cfg Setup dialog.
Page 64
Seanet Pro Operation Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 64 © Tritech International Ltd.
The current displayed Velocity of Sound used value is what was applied to the current sonar
scan. If Auto VOS is “OFF” then the Velocity of Sound used is based on the Manual VOS
applied in the ‘Environment’ (e.g. click on ‘Settings’ – ‘Environment’ in Seanet Toolbar).
Note
The Gemini Sonar will apply Manual VOS in steps of 3.2m·s-1, starting from
the minimum limit of 1400m·s-1. For example, if 1402.1m·s-1 was set in the
‘Environment’ page then Gemini will round to nearest 3.2m·s-1 step and
consequently the ‘Velocity of Sound used’ will be returned as 1403.2m·s
-1
Overlay
Figure 7.11.
When enabled, this option can be used to place and size an overlay shape or outline onto
the Sonar display canvas.
Style Select the type of shape from; Circle, Rectangle. Triangle.
Size Set the Width and Height of the shape.
Pos Move the Shape with X, Y position offset from display origin.
Line Width Line width.
Centre On Enable centre marker (+) for the shape.
Page 65
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 65 © Tritech International Ltd.
8. Maintenance
8.1. After using Sonar
Make sure that after using the sonar head that it is washed down with fresh water and check
the unit for any signs of obvious damage. Pay particular attention to the transducer head and
free any organic matter which has become trapped. Once the unit is clean; dry thoroughly
and place in storage container.
8.2. If storing the sonar for extended periods
Make sure that the sonar is completely dry (if necessary leave to dry in air before stowing).
Pack into storage container along with several pouches of silica gel.
8.3. Regular maintenance
Caution
It is essential to have a regular maintenance schedule so that any defects arising
from corrosion or erosion can be spotted early and corrected before they cause
severe damage to the unit. It is recommended that the unit is annually serviced
and can be returned to Tritech International Ltd for this purpose.
Although the Gemini range is not field serviceable regular care and maintenance of the unit
should be carried out. Ensuring that the electrical connectors are clean and free of corrosion
will aid in preserving the working lifespan of the unit. Particular care should be taken for units
that use an o-ring seal on the connectors and blanking caps to ensure that these o-rings are
seated properly.
Regular visual inspection of the unit around the areas where salt build up can occur will help
highlight any potential issues of corrosion and allow for corrective action to be undertaken
before any integrity failure of the unit. The areas around the Transmitter and Receiver array
should be inspected, as well as the VOS sensor. The mechanical interface between the
bulkhead connectors and housing elements should also be inspected.
It is recommended that Gemini units be returned to Tritech as part of a regular maintenance
schedule. An annual return is highly recommended, but this can be lengthened, or shortened,
by various factors:
• Frequency of use
• The operating environment (i.e. salinity, temperature)
• The presence of any galvanic action from dissimilar metals, or case voltages
Page 66
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 66 © Tritech International Ltd.
9. Troubleshooting
The software reports that no sonars are detected
VDSL System – Check the VDSL link light on the Gemini Hub (note that it may take up
to 1 minute to establish a stable VDSL link). If there is no VDSL link light then check all
cabling between Gemini Hub and the sonar and verify that the sonar is powered correctly
with appropriate voltage at the sonar. If there is a VDSL link light then the sonar is operational
and the problem will be either the network connection between Gemini Hub and the PC or
the network configuration on the PC.
Ethernet System – Check all cabling to the sonar and verify that it is powered correctly with
appropriate voltage at the sonar. Also check that the correct cable is in use - for Ethernet
systems this needs to be a cable of at least Cat5e standard. If the sonar has successfully
established a link then the problem will be with the network settings on the PC.
Note
Ethernet connection requires Cat5e cable for the entire cable run (max 80m) –
lengths of untwisted cable must be kept to an absolute minimum.
All Systems – Some firewalls have been known to cause this issue. Contact the network
administrator for advice if the sonar is connected to a network where disabling the firewall
would present a security risk.
Sonar goes offline while operating on deck
The sonar head outputs heat to the body casing (using it as a heatsink) which is dissipated
to the surrounding water during normal operation.
In order to protect the internal electronics from damage due to overheating a thermal cutoff will shut down the sonar if it gets too warm. It will be necessary to allow the unit to cool
down before it will operate again.
The unit should not be operated out of water for extended periods.
Sonar is present but will not ping
VDSL System – Check the reported link speed – it must be greater than 10Mbit·s
-1
downstream to function correctly. If it is less than this then the cable run is either too long or
the VDSL twisted pair is of poor quality.
All Systems – Check your network settings on the PC. Typing "route print" from the command
line will show the PC routing table. The sonar and PC must be on the same subnet and the
PC’s routing table needs to be set up so that packets are routed correctly to the sonar. If the
sonar is receiving ping requests then the IP address of the PC will appear in the “Connected
IP Address” field in the advanced settings page of the software.
If the sonar is connected to the PC then the most likely cause is particularly bad packet loss
on the network between sonar and PC.
Page 67
Troubleshooting Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 67 © Tritech International Ltd.
Note
The sonar will only respond to ping requests from IP addresses on the same
subnet as the sonar. Some firewalls have been known to cause this issue. To
view the computers routing table type "route print" from the command line.
Update rate is slow and there are sometimes large gaps between
pings
VDSL System - The VDSL link is susceptible to electrical noise induced by turning other
devices on and off such as thrusters on an ROV. If the link keeps going down try using the
“Medium Noise” or “High Noise” VDSL setting in the advanced option. Higher Noise settings
trade off speed for reliability of the network link. This may reduce the ping rate slightly but the
link will be more reliable in the presence of noise. Check all connectors on the VDSL twisted
pair, poor contacts have been known to cause this issue.
Ethernet System – There may be noise induced onto the Ethernet cables, be sure to route
these as far away as practicable from noise sources.
All Systems – Some poor quality PC network cards have problems with the large data rate
from the Gemini sonar and drop a significant amount of packets. If you have large packet
loss, try updated network card drivers and a different brand of network card. Also check that
the PC and graphics chipset meet the minimum spec.
Velocimeter reports unrealistic speed of sound
This is often caused by bubbles forming on the metal faces at the front of the sonar,
particularly if the sonar has been stationary for an extended period of time in a tank. Wiping
the surface to remove bubbles should resolve the issue.
Page 68
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 68 © Tritech International Ltd.
Appendix A. Setting the computer IP address in
Windows XP
The following instructions apply to a computer running Windows XP, though the sequence
for other operating systems will be similar.
If the computer is connected to a network already, disconnect it from that network.
From the Start Menu select Control Panel. From the Control Panel Explorer window that
opens, double click on Network Connections. From the list of available network connections
that opens, double click on the Ethernet connection which will be used to connect to the
Gemini head.
Click the Properties button on the dialog which opens. This will open a dialog which looks
like this:
Scrolling the "This connection uses the following items" box will reveal an item titled "Internet
Protocol (TCP/IP)". Click this item to select it, and then press the Properties button. The
following dialog should open:
Page 69
Setting the computer IP address in Windows XP Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 69 © Tritech International Ltd.
Make a note of the settings as currently used by the computer; these will be needed to restore
the computer to any existing network. Refer to the appropriate section of this manual for the
correct IP address to use.
The following screenshot shows the dialog after those changes have been made:
Page 70
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 70 © Tritech International Ltd.
Appendix B. Setting the computer IP address in
Windows 7
The following instructions apply to a computer running Windows 7, though the sequence for
other operating systems will be similar.
Disconnect the computer from any existing network.
First click on the Start Menu and select Control Panel.
Under Network and Internet click on View network status and tasks.
This will bring up the Network and Sharing Center which allows configuration of any
networks on the computer. Click on Change adapter settings on the left-hand pane.
Page 71
Setting the computer IP address in Windows 7 Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 71 © Tritech International Ltd.
A list of attached network devices should now present itself. Find the one which the Gemini
head is to be connected to and double-click on it.
The Local Area Connection Properties dialog should be displayed. Find the entry
labelled Internet Protocol Version 4 (TCP/IPv4), select it and then click on the
Properties button.
In the properties dialog which opens there will either be Obtain an IP address
automatically or Use the following IP address selected. If an IP address is
already present, make a note of it before changing any values since it will be needed if the
computer is ever restored to the previous network. Refer to appropriate section of this manual
for the correct IP addresses to use.
Page 72
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 72 © Tritech International Ltd.
Appendix C. Setting the Gemini Device IP Address
in Gemini Software
These instructions are applicable to any Gemini device.
For a Sonar or
Profiler
Enter the ID into the Sonar box of the Advanced Configuration options
(upper right hand side of the screen).
For a Hub Enter the ID into the Hub ID box on the Hub Setup tab.
After starting the Gemini software and
connecting a Gemini device click the
Advanced tab at the upper left hand side of
the screen to show the advanced settings
screen, and expand the Device Network
Details area by clicking the + button next
to it.
Note
The Gemini device should be connected directly to the computer and any other
Gemini devices should be disconnected.
Once the ID of the Gemini has been entered at the top of the screen, the details for the new
IP address can be entered. Three items need to be entered, the Device ID (to ensure that
the correct Gemini is being altered), the new IP Address and the new Subnet Mask.
Once these details have been entered, pressing the Send Device Details button will
start the process of changing the IP address. A dialog box will open, requesting confirmation
of the change.
Note
If the Gemini is online then it will not be possible to alter the IP address details.
Make sure that the Gemini is offline before trying to change it.
Clicking the Yes button will program the new IP address details into the Gemini. The new
IP address followed by a reboot command will be sent. When the device reboots it will be
using the new IP address, and therefore will not show up on the status display. Once the IP
address of the computer has been changed back to its original settings the Gemini should
once again appear on the status display.
Page 73
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 73 © Tritech International Ltd.
Appendix D. Setting the Gemini Head IP Address in
Seanet Pro
Run Seanet Setup and click on Gemini LAN in the Setup menu.
This will open the Gemini LAN Setup dialog.
Ensure that the Gemini is connected directly to the computer.
In the Selected Sonar drop-down control, ensure that the correct Gemini is selected. The
current Sonar IP Address and Subnet Mask are displayed on the left hand side of the
form. These are the settings the selected Gemini is currently programmed with.
In the Modify Network Address using… panel on the right hand side, update New IP
Address and/or New Subnet Mask. The text box background colour will change from white
to red to indicate a change has been made, as shown below.
Once these details have been entered, pressing the OK button will start the process of
changing the IP address. A dialog box will open, requesting confirmation from the user, the
box looks like this.
Check that the change details have been entered correctly and click on the OK button to
accept.
The Gemini node Status will change to Unknown whilst the new details are being
programmed into the Sonar. This will take a few seconds.
When the programming is finished the it may be necessary to reset the computer IP address
to enable communication to resume with the Gemini (see the section Setting the Computer
Page 74
Setting the Gemini Head IP Address in Seanet Pro Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 74 © Tritech International Ltd.
IP Address for details of how to do this). Once communication has been re-established the
following screen shows the sonar is connected:
Returning to Gemini LAN from the Setup menu should confirm that the changes have been
made successfully.
Page 75
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 75 © Tritech International Ltd.
Appendix E. Gemini Software String Decode
The Gemini Software is capable of handling input from various different types of sensors
using the following standard strings:
Depth strings
Name Description Format/Examples
Digi Parascientific Digiquartz
(depth sensor)
000.0
SonDepth Depth
$SONDEP...
Distance Marker strings
Name Description Format/Examples
TSS Altimeter 1 Marker Range
Rxx.xx
Ulvertech Bathy Marker Range
00000,xxxx
Page 76
Gemini Software String Decode Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 76 © Tritech International Ltd.
Heading, Position and Time strings
Name Description Format/Examples
CDL1 Heading, Pitch, Roll
Haaa.aP+ccc.ccR+eee.eeT...
GPGGA GPS position
$GPGGA...
GPGGA ZDA GPS position and UTC time
$GPGGA...
$GPZDA...
$GPZDA UTC Time
$GPZDA...
HEHDT Heading
$HEHDT...
Navi-Pack Position, Heading, Pitch, Roll
$G...
OctansAll Heading, Heave, Pitch,
Roll, Surge, Sway
$HEHDT...
$PHTRH...
$PHLIN...
OctansGHPR Heading, Heave, Pitch, Roll
$HEHDT...
$PHTRH...
OctansHead Heading
$HEHDT...
OctansLinear Heading, Heave, Surge, Sway
$HEHDT...
$PHLIN...
Octans Std 2 Heading, Heave, Pitch, Roll
:00000 -0000H-0000 -0000F
Simard EM3000 Heading, Heave, Pitch, Roll n/a
TSS Std 1
with HEHDT
Heave, Pitch, Roll and Heading
:000000 -0000H-0000 -0000
$HEHDT...
TSS 1
(No Heave) with
HEHDT
Pitch, Roll and Heading
:000000 -0000 -0000
$HEHDT...
Velocity of Sound strings
Name Description Format/Examples
AML Smart SVP Speed of Sound
0 1500.0
Speed of Sound Speed of Sound
1500.0
Note
With the exception of Simrad EM3000 (which is in binary format) all of the above
strings are in ASCII format and use <CR> as the synchronisation character.
Page 77
Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 77 © Tritech International Ltd.
Glossary
2D 2 Dimensional
ASCII American Standard Code for Information Interchange - a character
encoding scheme originally based on the English alphabet.
AVI Audio Video Interleave - a video format introduced by Microsoft
AWG American Wire Gauge
BMP A raster graphics image file format used to store bitmap digital images.
CAT5e Category 5 enhanced - a standard specification for Ethernet cables.
CD-ROM Compact Disc - Read Only Memory
CPU Central Processing Unit, the processor of a computer.
DC Direct Current
DLL Dynamic Link Library - Microsoft's implemenation of the shared library,
implemented in Microsoft Windows and OS/2 operating systems,
filenames have .dll extension.
Ethernet A family of computer networking technologies for local area networks
(LANs).
GB Gigabyte = 1000MB
Gemini Unless specified this can refer to any of the multibeam sonars in the
Gemini range by Tritech International Ltd such as the Gemini Imager
(720id), Narrow Beam Imager or Gemini Profiler (620pd).
Gemini Hub A rack mountable device capable of driving 2 Gemini sonars and
multiple serial sensors and outputting the data to a PC network.
GIF Graphics Interchange Format - a bitmap image format developed by
CompuServe.
Gigabit Measure of transfer speed through Ethernet, usually considered to be
1000Mbit·s
-1
GPS Global Positioning System.
IP Internet Protocol - generally used as a means of addressing individual
computers.
IPA Isopropyl Alcohol (also known as 2-propanol, isopropanol, rubbing
alcohol and iPrOH).
IT Information Technology
kB Kilobyte = 1000 bytes
LAN Local Area Network
LED Light Emitting Diode
MB Megabyte = 1000kB
Page 78
Glossary Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 78 © Tritech International Ltd.
Mbit·s
-1
Megabit per second - data transfer rate equal to 1000 kilobits per
second.
Multibeam A sonar which forms multiple "beams" of sound so it can update in real
time and does not have to perform a full scan like a traditional sonar.
PC Personal Computer
PNG The standard filename extension for Portable Network Graphics - a
bitmapped image format employing lossless compression.
PSU Power Supply Unit
RAM Random Access Memory
RAT Remote Access Terminal - the detachable front part of the Tritech
Surface Control Unit (SCU) computer. Provides an alternative to using
a keyboard and mouse.
RJ45 Registered Jack wiring scheme commonly used to refer to
the 8 position 8 contact (8P8C) connector wired for Ethernet
communications.
RLE Run-length Encoding - a form of data compression in which sequences
of data that have the same value are stored as a single datum point
and count.
ROV Remotely Operated Vehicle
RS232 Traditional name for a series of standards for serial binary data control
signals.
RX Receive (data)
SCU Surface Control Unit - a specially manufactured computer which is
rack mountable and capable of processing the data from the sonar
equipment running either Windows XP Embedded or Windows 7 and
Seanet Pro or Gemini software.
Seanet Pro The software supplied by Tritech International Ltd which is capable of
running all the sonar devices.
TTL Transistor Transistor Logic - superfluous terminology intended to mean
a signal that can be input to the Gemini to trigger advanced functions.
TX Transmit (data)
USB Universal Serial Bus.
USBL Ultra Short Base Line (positioning system)
UTC Coordinated Universal Time (time data closely related to Greenwich
Mean Time (GMT)).
UTP Unshielded Twisted Pair (cable) is a standard cable wiring scheme
used for communications cable with no cable screen and no pair
shielding (known as Unshielded Unshielded Twisted Pair (U/UTP)
under ISO/IEC 11801).
VDSL Very-high-bitrate Digital Subscriber Line - a method of communicating
down un-twisted copper cable at uplink speeds of 18Mbit·s-1 and
downlink speeds of 50Mbit·s-1.
Page 79
Glossary Gemini Imaging Sonar
Document: 0685-SOM-00001, Issue: 11 79 © Tritech International Ltd.
VOS Velocity of Sound
WMV Windows Media Video - a compression format for several proprietary
codecs developed by Microsoft for storing video files.
Loading...