All information, illustrations and specifications in this manual are based on
the latest information available at the time of publication. The right is
reserved to make changes at any time without notice.
COPYRIGHT2007
DEERE & COMPANY
Moline, Illinois
All rights reserved
A John Deere ILLUSTRUCTIONManual
i
121907
PN=1
Page
RTK using Straight, Curves or Circle ........35-16
Example A ............................35-17
Operating Parameters ...................35-18
PDOP Definition ........................35-19
PDOP Operating Values..................35-21
StarFire Signal Monitoring System ..........35-23
Antenna Height.........................35-25
Specific Tower Setup Information ...........35-26
Utilizing Both The 91 m (300 ft) RTK
Extension Harness And Low Loss Coax
Cable ..............................35-27
Utilizing The RTK Extension Harness ........35-28
Utilizing A Repeater .....................35-28
Utilizing Just Low Loss Coax Cable .........35-29
Leaving The Radio And Receiver As A
Single Unit ..........................35-29
Troubleshooting and Diagnostics
Accessing GREENSTAR 2 Diagnostic
Addresses............................40-1
Accessing Original GREENSTAR Display
Fault Codes ..........................40-3
STARFIRE iTC Diagnostic Addresses ........40-4
Fault Codes—StarFire iTC .................40-8
Diagnostic Trouble Codes—StarFire iTC .....40-11
GreenStar Deluxe - Diagnostic Readings .....40-13
Contents
Specifications
Unified Inch Bolt and Screw Torque Values ....45-1
Metric Bolt and Screw Torque Values.........45-2
Declaration of Conformity ..................45-3
Safety Note Regarding the Subsequent
Installation of Electrical and Electronic
Appliances and/or Components ...........45-3
ii
121907
PN=2
Safety
Recognize Safety Information
This is a safety-alert symbol. When you see this symbol
on your machine or in this manual, be alert to the
potential for personal injury.
Follow recommended precautions and safe operating
practices.
Understand Signal Words
A signal word—DANGER, WARNING, or CAUTION—is
used with the safety-alert symbol. DANGER identifies the
most serious hazards.
DANGER or WARNING safety signs are located near
specific hazards. General precautions are listed on
CAUTION safety signs. CAUTION also calls attention to
safety messages in this manual.
Follow Safety Instructions
Carefully read all safety messages in this manual and on
your machine safety signs. Keep safety signs in good
condition. Replace missing or damaged safety signs. Be
sure new equipment components and repair parts include
the current safety signs. Replacement safety signs are
available from your John Deere dealer.
DX,ALERT –19–29SEP98–1/1
T81389 –UN–07DEC88
TS187 –19–30SEP88
DX,SIGNAL –19–03MAR93–1/1
Learn how to operate the machine and how to use
controls properly. Do not let anyone operate without
instruction.
Keep your machine in proper working condition.
Unauthorized modifications to the machine may impair the
function and/or safety and affect machine life.
If you do not understand any part of this manual and need
assistance, contact your John Deere dealer.
05-1
TS201 –UN–23AUG88
DX,READ –19–03MAR93–1/1
121907
PN=4
Safety
Prepare for Emergencies
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors, ambulance service,
hospital, and fire department near your telephone.
Practice Safe Maintenance
Understand service procedure before doing work. Keep
area clean and dry.
Never lubricate, service, or adjust machine while it is
moving. Keep hands, feet , and clothing from
power-driven parts. Disengage all power and operate
controls to relieve pressure. Lower equipment to the
ground. Stop the engine. Remove the key. Allow machine
to cool.
Securely support any machine elements that must be
raised for service work.
Keep all parts in good condition and properly installed. Fix
damage immediately. Replace worn or broken parts.
Remove any buildup of grease, oil, or debris.
On self-propelled equipment, disconnect battery ground
cable (-) before making adjustments on electrical systems
or welding on machine.
DX,FIRE2 –19–03MAR93–1/1
TS291 –UN–23AUG88
On towed implements, disconnect wiring harnesses from
tractor before servicing electrical system components or
welding on machine.
05-2
TS218 –UN–23AUG88
DX,SERV –19–17FEB99–1/1
121907
PN=5
Safety
Install and Remove StarFire Receiver and
Brackets Safely
When installing and removing the StarFire receiver, follow
these guidelines to prevent potential injury from falling:
• Use an appropriate ladder or platform to easily access
mounting location.
• Ensure sturdy and secure footholds and handholds.
• Avoid installing or removing receiver in wet or icy
conditions.
The receiver mast used on implements is heavy and can
be awkward to handle. If installing or removing a receiver
mast on an implement, follow these guidelines:
• Use two people for mounting locations not accessible
from the ground or a service platform.
• Use proper lifting techniques.
• Wear proper protective equipment.
PC10340 –UN–27SEP07
OUO6050,0000E4D –19–27SEP07–1/1
05-3
121907
PN=6
StarFire iTC Receiver
StarFire iTC Receiver
Receiver is located on cab of machine. It receives global
positioning and differential correction signal through a
single receiver and integrates signal for use with system.
Terrain Compensation Module (TCM) is integrated into
receiver and is a navigational aid used with receiver to
enhance vehicle position and course parameters that GPS
provides. TCM corrects for vehicle dynamics such as roll
on side-slopes, rough terrain or varying soil conditions.
StarFire iTC Mounting Instructions
OUO6050,0000C0C –19–18OCT07–1/4
1. Read “Install and Remove StarFire Receiver and
Brackets Safely” in the Safety section.
2. Verify that vehicle side receiver bracket bar (A) is not
bent inward or outward.
3. Position StarFire iTC on bracket. Align mounting
pegs (A) on receiver with notches in vehicle
bracket. Ensure pegs are firmly seated in notches
4. Position receiver latch (D) around bracket bar. Turn
latch handle to tighten latch around bracket bar.
Bracket bar should compress slightly.
and metal tab (B) is above bracket bar (C).
OUO6050,0000C0C –19–18OCT07–3/4
5. Fold latch handle upwards against receiver.
PC8329 –UN–31AUG04
10-2
PC8330 –UN–31AUG04
OUO6050,0000C0C –19–18OCT07–4/4
121907
PN=8
GS2 Display—StarFire iTC
STARFIRE ITC softkey
The STARFIRE ITC - MAIN screen contains four tabs:
INFO tab
SETUP tab
ACTIVATIONS tab
SERIAL PORT tab
NOTE: If StarFire iTC is hooked into the CAN Bus with
an Original GreenStar display and either a
GSD2100 or 2600, the StarFire iTC will always be
displayed on the GSD2100 or 2600.
NOTE: If an Original StarFire receiver is hooked to a
GSD2100 or 2600, the setup and information
pages are displayed through Original GreenStar
Monitor. MENU >> ORIGINAL GREENSTAR
MONITOR. To view or change setup information,
SETUP >> STARFIRE RECEIVER. To view GPS
information INFO >> STARFIRE RECEIVER.
PC8663 –UN–05AUG05
PC8659 –UN–05AUG05
PC8680 –UN–05AUG05
MENU button
STARFIRE ITC button
STARFIRE ITC softkey
15-1
OUO6050,000223B –19–14NOV06–1/1
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PN=9
INFO tab
GS2 Display—StarFire iTC
StarFire iTC - Main—Info Tab
A—Info tabE—Position ModeI—AltitudeM—GPS Signal
B—Setup tabF—Differential ModeJ—GPS CourseN—Differential Signal
C—Activations tabG—LatitudeK—GPS SpeedO—Roll Angle
D—Serial Port tabH—LongitudeL—AccuracyP—Yaw Rate
The INFO tab shows information and status of
incoming GPS and differential correction signals. No
information on this screen can be changed. It is for
viewing only:
• Differential Mode: Indicates status of GPS signal:
2-D (two dimensional with latitude and longitude of
vehicle) or 3-D (three dimensional with altitude,
latitude, and longitude of vehicle).
• Lat: Displays vehicle location latitude coordinates
• Position Mode: Indicates whether receiver is
calculating a 3D position, 2D position, or no position
(No Nav). It also shows status of differential signal:
with respect to Prim Meridian (east or west).
SF1 (StarFire 1 differential), SF2 (StarFire 2
differential).
Continued on next page
OUO6050,000223C –19–14NOV06–1/2
15-2
PC9705 –UN–10NOV06
121907
PN=10
GS2 Display—StarFire iTC
NOTE: TOGGLE button allows operator to change the
way latitude and longitude are displayed from
degrees/minutes/seconds to decimal degrees.
• Altitude: displays height of receiver, measured from
top of dome, in feet (meters) above sea level.
• GPS course: Displays direction of travel, in degrees
relative to true north (zero degrees) as measured by
receiver. Angle is measured in clockwise direction
NOTE: Course and speed normally show small
speeds and various courses even when
machine is not moving.
• GPS speed: displays ground speed of machine in
miles per hour (kilometer per hour) as measured by
receiver.
• GPS Accuracy Indicator (GPS AI): GPS AI gives
indication of GPS position accuracy achieved by
receiver, and is displayed as a percentage (0-100%)
When receiver is initially powered, GPS AI will display
0%. As receiver acquires satellites and calculates a
position, GPS AI will increase as accuracy improves.
Acceptable guidance performance for Parallel Tracking
and AutoTrac is achieved when GPS AI displays 80%
or greater. This may take up to 20 minutes. GPS
accuracy is affected by many factors. If 80% accuracy
or greater is not achieved within 25 minutes, consider
the following possibilities:
• L1/L2 signal to noise ratio (SNR) – radio interference
from 2-way radios or other sources may cause low
SNR (check satellite button – Graph)
• Satellite position in sky – poor GPS satellite
geometry can reduce accuracy (check satellite
button – SkyPlot)
• Number of satellites above elevation mask – this is
the total number of GPS satellites available to
receiver that are above 7 degrees elevation mask
(check satellite button – SkyPlot).
• Number of satellites in solution – this is total number
of satellites that are being used by receiver to
calculate a position (check satellite button– SkyPlot).
• GPS Signal Quality: Displays quality of signals being
received from constellation of GPS satellites.
• Differential Signal Quality: Displays quality of
differential correction signal being received by
receiver.
• TCM (Terrain Compensation Module):
– Roll Angle: Is both a graphical and numerical
representation of amount of roll TCM is
measuring, relative to calibrated zero degree
reference. A positive roll angle means vehicle is
rolled to right (depicts what horizon would look
like from cab).
– Yaw Rate: This gives a graphic representation
and a numeric figure for amount of rotation TCM
is measuring. Positive yaw rate means vehicle is
turning to right.
• Unobstructed view of sky – trees, buildings, or other
structures may block receiver from receiver signals
from all available satellites.
15-3
OUO6050,000223C –19–14NOV06–2/2
121907
PN=11
SETUP tab
GS2 Display—StarFire iTC
StarFire iTC - Main—Setup tab
A—Info tabE—Correction ModeH—Fore/AftK—Hours On After Shutdown
B—Setup tabF—Default CorrectionI—HeightL—TCM On/Off toggle button
C—Activations tabFrequencyJ—Enable QuickStartM—TCM Calibration button
D—Serial Port tabG—Mount Direction
The SETUP tab allows for setup of the following:
• Hours ON After Shutdown
• TCM Calibration
• Correction Mode
• Correction Frequency
• Mount Direction
• Fore/Aft
• Height
Differential correction is the process by which GPS
accuracy is improved. (See OVERVIEW: SF1/SF2
Activations, SF2 Subscription under Activations
section.)
• QuickStart
OUO6050,000223D –19–14NOV06–1/1
15-4
PC9706 –UN–17OCT07
121907
PN=12
Correction Mode
GS2 Display—StarFire iTC
Contains available StarFire corrections that the
receiver is licensed for. SF1 and OFF will always
appear, however, SF2 will only appear with a valid
SF2 license (See Activations section). RTK appears
when a RTK mode is selected from RTK softkey.
Correction Frequency
This is the frequency that is used to receive differential
correction signals. The default frequency is a view only
field when default check box is checked. By
de-selecting default check box a correction frequency
can be manually entered.
NOTE: By selecting OFF, StarFire receiver will not
receive SF1 or SF2 correction signals, but will
receive WAAS/EGNOS correction signals.
OUO6050,000223E –19–14NOV06–1/1
IMPORTANT: DO NOT change default StarFire
Correction Frequency unless
instructed to do so by a John Deere
Dealer or by John Deere AG
Management Solutions.
OUO6050,000223F –19–14NOV06–1/1
Mount Direction
NOTE: Receivers attached to tractors, sprayer, and
combines are typically in FORWARD position.
Receivers attached to GATORS are typically in
BACKWARD position.
Mounting direction is direction receiver is facing.
This setting defines mounting orientation of receiver.
TCM uses this setting to determine correct direction of
vehicle roll.
The fore/aft value is the distance that receiver is
located from pivot point of tractor.
On some AutoTrac-equipped vehicles, fore/aft value
will be automatically detected and entered during
power up.
• Fore/Aft value is shown and input box is disabled –
value has been automatically set and cannot be
changed. The value shown may not be the exact
distance that the receiver is located from pivot point
of tractor, but the best Fore/Aft value for AutoTrac.
• Fore/Aft value is shown and input box is enabled –
value must be entered manually.
To enter Fore/Aft value:
• Select FORE/AFT input box
PC8278 –UN–22JUN04
Fixed Axis Wheels or Tracks Vehicles
• Enter value using numeric keypad
Recommended StarFire Fore/Aft values For John Deere
Vehicles
John Deere VehicleStarFire Fore/Aft cm (in.)
6000 Series Tractors180 cm (71 in.)
7000 Series Tractors210 cm (82.5 in.)
8000 Series Tractors210 cm (82.5 in.)
8000T Series Tractors51 cm (20 in.)
9000 Series Tractors-51 cm (-20 in.)
9000T Series Tractors51 cm (20 in.)
4700 Series Sprayers280 cm (110 in.)
4900 Series Sprayers460 cm (181 in.)
Combine220 cm (87 in.)
Forage Harvester157 cm (62 in.)
PC8277 –UN–01MAY06
15-6
OUO6050,0002241 –19–25NOV06–1/1
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PN=14
Height
GS2 Display—StarFire iTC
Height is measured from ground to top of StarFire
Dome. Select input box and use numeric keypad to
enter height.
IMPORTANT: Under or over compensation for
vehicle roll angles will occur if
height is incorrectly entered during
setup.
Example: On a 10 degree slope with
a StarFire height error of 30.5 cm (12
in.) will result in a position offset of
5 cm (2 in.) on ground).
Factory default setting is “126”. On
some AutoTrac-equipped vehicles,
height value will be automatically
detected and entered during power
up. Because this dimension is
critical for proper operation of TCM
and can vary due to vehicle
configuration and tire sizes, operator
should still measure actual distance
to be entered each time TCM is
installed on a different vehicle.
NOTE: Use chart for example StarFire Height values.
Chart figures are approximate heights.
John Deere VehicleStarFire Height cm (in.)
6000 Series Tractors280 cm (111 in.)
7000 Series Tractors305 cm (120 in.)
8000 Series Tractors320 cm (126 in.)
8000T Series Tractors320 cm (126 in.)
9000 Series Tractors361 cm (142 in.)
9000T Series Tractors356 cm (140 in.)
4700 Series Sprayers389 cm (153 in.)
4900 Series Sprayers396 cm (156 in.)
Combine396 cm (156 in.)
NOTE: Actual height may vary depending on tire size
or inflation.
QuickStart
Reduces amount of time required before full accuracy
is achieved. If QuickStart is enabled (check box
checked) and receiver has SF1 or SF2 when it is
powered down a position is saved for future
QuickStart. If power is restored to receiver within time
period defined under Hours On After Shutdown,
QuickStart won’t be needed since receiver power was
never disrupted. If duration has exceeded Hours On
After Shutdown, QuickStart will be initiated. Saved
OUO6050,0002242 –19–14NOV06–1/1
position will be used to bypass startup warm up period
that is usually required. Receiver cannot move while
this QuickStart is taking place. It may take up to 6
minutes for QuickStart to complete. User will be
notified on screen when it is done.
To enable QuickStart mode select check box so that a
check appears. To disable, select check box until
check disappears.
OUO6050,0002243 –19–14NOV06–1/1
15-7
121907
PN=15
Hours On After Shutdown
GS2 Display—StarFire iTC
Defines how long receiver remains powered up after
ignition is turned off (0, 3, 6, 12, 24 hours). If ignition is
turned on within number of hours defined, receiver will
re-establish full SF1 or SF2 accuracy within a few
seconds (assuming it had SF1 or SF2 when ignition
was turned off).
TCM Calibration
Define desired number of hours by selecting
drop-down box.
OUO6050,0002244 –19–14NOV06–1/1
Floating Front Axle Vehicles
A—Rear AxleB—Vehicle Pivot Point
TCM can be toggled ON or OFF by selecting TOGGLE
button. When TCM is turned off, StarFire GPS
message will not be corrected for vehicle dynamics or
side slopes. TCM will default to ON when cycling
power.
PC8278 –UN–22JUN04
Fixed-Axis Wheels Or Tracks Vehicles
NOTE: TCM must be turned on for AutoTrac to
activate.
TCM must be calibrated so receiver can determine
zero degree roll angle.
Continued on next page
OUO6050,0002245 –19–14NOV06–1/4
15-8
PC8277 –UN–01MAY06
121907
PN=16
GS2 Display—StarFire iTC
NOTE: Calibrate receiver when it is attached or
reattached to machine. Receiver does not
require recalibration until removed from
machine and reattached.
Positioning Machine during Calibration
IMPORTANT: When calibrating, it is important that
TCM is at same angle when facing
either direction. If roll angle is a
positive 2 degrees when facing one
direction, vehicle needs to be a
negative 2 degrees when facing
opposite direction. To position TCM
at same angle it is important when
turning vehicle around and facing
other direction that tires are placed
in correct location. Once vehicle is
parked on a hard flat surface, note
location of tires on ground. When
turning around use following
instructions:
• Floating Front Axle Vehicles
(MFWD, ILS, TLS)—put rear
axle/wheels in same location when
performing 2 point calibration. See
above diagram for Floating Front
Axle Vehicles.
• Fixed-Axis Wheels Or Tracks
Vehicles (Track Tractors, 47X0 and
49X0 Series Sprayers, 9000, And
9020 Series Wheel Tractors)—
Place all in same location when
facing either direction. See above
diagram for Fixed-Axis Wheels Or
Tracks Vehicles.
Continued on next page
OUO6050,0002245 –19–14NOV06–2/4
15-9
121907
PN=17
GS2 Display—StarFire iTC
Calibration Surface
IMPORTANT: Vehicle must be on a hard, flat level
surface for calibration. If TCM is not
calibrated on a level surface or TCM
mounting angle is not level in relation
to vehicle angle (StarFire mounting
bracket or vehicle cab being slightly
offset, uneven tire pressures from one
side to other, etc.) operator may see
offset during operation. This offset
could look like a consistent skip (A) or
overlap (B) in pass-to-pass operation.
To eliminate offset, re-calibrate on a
level surface, drive down a pass, turn
around and drive down same pass in
opposite direction. If vehicle does not
follow same pass, measure offset
distance and enter in implement offset.
After initial calibration of TCM, it is not
necessary to calibrate again unless
TCM angle in relation to vehicle has
changed. For example, tire pressure has
been lowered on one side of vehicle
causing vehicle angle in relation to
ground to change.
PC8279 –UN–16JUL04
A—Skip
B—Overlap
Calibration Procedure:
1. Press CALIBRATION button.
2. Park vehicle on a hard, level surface and come to a
complete stop (cab is not rocking).
3. Press ENTER button.
4. Calibrating Status bar will appear. Once status reaches
100% it will automatically advance.
5. Turn vehicle 180 degrees to face opposite direction.
Ensure that tires are in proper location for fixed or
floating front axle and vehicle has come to a complete
stop (cab is not rocking).
6. Press ENTER CALIBRATION button.
7. Calibrating Status bar will appear. Once status reaches
100% it will automatically advance.
8. Once finished, a calibration value will be displayed. 0
degree calibration value is the difference between
factory calibration value and actual calibration value
which was just determined.
Continued on next page
15-10
OUO6050,0002245 –19–14NOV06–3/4
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PN=18
GS2 Display—StarFire iTC
9. Press ENTER button to return to SETUP tab.
OUO6050,0002245 –19–14NOV06–4/4
15-11
121907
PN=19
ACTIVATIONS tab
GS2 Display—StarFire iTC
StarFire iTC - Main—Activations tab
A—Info tabC—Activations tabD—Serial Port tabE—Activation Code Enter
B—Setup tabbutton
ACTIVATIONS tab contains the following:
– Yes-Enabled – A valid SF2 license exists and SF2
is the differential correction mode selected.
• Valid activations for receiver:
– SF1 – activated on every StarFire iTC.
– SF2 Ready – receiver has to be ordered SF2
Ready or an upgrade to SF2 ready from SF1
World Solution must be purchased.
– RTK – activated with valid RTK activation
(requires receiver to be SF2 Ready).
• SF2 License: Displays status of receiver’s SF2
– Yes-Disabled – A valid SF2 license exists, but
SF2 is not the differential correction mode
selected.
– No – Appears when no valid SF2 license exists or
SF2 license has expired.
• SF2 End Date: Displays date at which SF2 License
will expire.
• StarFire SN: StarFire serial number
License.
Continued on next page
OUO6050,0002246 –19–14NOV06–1/3
15-12
PC9707 –UN–10NOV06
121907
PN=20
GS2 Display—StarFire iTC
Activation Code
NOTE: Activation Codes are needed to obtain SF2 Ready
and RTK Activations, and SF2 license
subscription.
ENTER button is used to enter 24-digit codes for SF2
Ready and RTK Activations, SF2 license subscription and
deactivation codes for transferring all StarFire activations
and licenses mentioned above.
1. Upon selecting ENTER button an Activation Code box
appears with three input boxes.
NOTE: If more than 8 digits are entered into an input box,
“99999999” will appear. Reselect box and type
only 8 digits into input box.
2. Select first input box labeled Digits 1-8 and enter first 8
digits of 24-digit code.
3. Select second input box labeled Digits 9-16 and enter
second 8 digits of 24-digit code.
4. Select third input box labeled Digits 17-24 and enter
last 8 digits of 24 digit code.
5. Press ENTER button.
6. If 24-digit code is valid and entered correctly a
confirmation message will appear.
Activation Code
PC9708 –UN–10NOV06
A—Enter button
B—Cancel button
7.Deactivation Code input
This input will only appear when a deactivation code has
been entered following procedure listed above. It will
display 6-digit deactivation codes for SF2 License, SF2
Ready and RTK activations. These codes are needed
when transferring the above mentioned activations or
license to another receiver.
Activation/License Status Window
Displays messages when SF2 License has expired and
provides user with option to use a Grace Period.
Continued on next page
OUO6050,0002246 –19–14NOV06–2/3
15-13
121907
PN=21
GS2 Display—StarFire iTC
NOTE: Three 24 hour Grace periods are available when
current license expires. This is provided to allow
sufficient time for operator to renew a license.
Grace period signal will be SF2 differential
correction signal.
Using a Grace Period
1. Select USE 1 button from status window
2. Select YES button
OUO6050,0002246 –19–14NOV06–3/3
15-14
121907
PN=22
SERIAL PORT tab
GS2 Display—StarFire iTC
StarFire iTC - Main—Serial Port tab
A—Info tabC—Activations tabE—Baud RateG—Messages
B—Setup tabD—Serial Port tabF—Output Rate
Configure RS232 and NMEA message information.
• Define output rate by toggling
– 1Hz or 5Hz
Rates:
• Define Baud Rate by selecting list input
– Baud Rates: 4800, 9600, 19200, 38400
Messages:
• Allows for output of 5 different NMEA strings:
– GGA, GSA, RMC, VTG, and ZDA
OUO6050,0002247 –19–14NOV06–1/1
15-15
PC9709 –UN–25SEP07
121907
PN=23
GS2 Display—StarFire iTC
NMEA Strings
NMEA String Data – Utilizing a third party GPS receiver or
utilizing a StarFire iTC
National Marine Electronics Association (NMEA) has
developed a specification that defines the interface
between various pieces of electronic equipment.
One of the most important NMEA sentences include the
GGA which provides the current Fix data, the RMC which
provides the minimum GPS sentences information, and
the GSA which provides the Satellite status data.
GGA - essential fix data which provide 3D location and
accuracy data.
GGA STRING EXAMPLE:
$GPGGA,123519,4807.038,N,01131.000,E,
1,08,0.9,545.4,M,46.9,M,,*47
Where:
GGAGlobal Positioning System Fix Data
123519Fix taken at 12:35:19 UTC
4807.038,NLatitude 48 deg 07.038’ N
01131.000,ELongitude 11 deg 31.000’ E
1Fix quality:
08Number of satellites being tracked
0.9Horizontal dilution of position
545.4,MAltitude, Meters, above mean sea level
46.9,MHeight of geoid (mean sea level) above WGS84
GSA - GPS DOP and active satellites. This sentence
provides details on the nature of the satellite constellation
fix. It includes the numbers of the satellites being used in
the current solution and the DOP. DOP (dilution of
precision) is an indication of the effect of satellite
geometry on the accuracy of the fix. It is a unitless
number where smaller is better. For 3D fixes using 4
satellites a 1.0 would be considered to be a perfect
number, however for overdetermined solutions it is
possible to see numbers below 1.0.
There are differences in the way the PRN’s are presented
which can effect the ability of some programs to display
this data. For example, in the example shown below there
are 5 satellites in the solution and the null fields are
scattered indicating that the almanac would show
satellites in the null positions that are not being used as
part of this solution. Other receivers might output all of the
satellites used at the beginning of the sentence with the
null field all stacked up at the end. This difference
accounts for some satellite display programs not always
being able to display the satellites being tracked. Some
units may show all satellites that have ephemeris data
without regard to their use as part of the solution but this
is non-standard.
GSA String Example
$GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39
Where:
GSASatellite status
AAuto selection of 2D or 3D fix (M = manual)
33D fix - values include::
04,05PRNs of satellites used for fix (space for 12)
2.5PDOP (dilution of precision)
1.3Horizontal dilution of precision (HDOP)
2.1Vertical dilution of precision (VDOP)
*39the checksum data, always begins with *
1=nofix
2=2Dfix
3=3Dfix
Continued on next page
15-17
OUO6050,0000ED9 –19–07NOV07–2/4
121907
PN=25
GS2 Display—StarFire iTC
RMC - NMEA has its own version of essential gps pvt
(position, velocity, time) data. It is called RMC, The
Recommended Minimum, which will look similar to:
RMC String Example
$GPRMC,123519,A,4807.038,N,01131.000,
E,022.4,084.4,230394,003.1,W*6A
Where:
RMCRecommended Minimum sentence C
123519Fix taken at 12:35:19 UTC
AStatus A=active or V=Void.
4807.038,NLatitude 48 deg 07.038’ N
01131.000,ELongitude 11 deg 31.000’ E
022.4Speed over the ground in knots
084.4Track angle in degrees True
230394Date - 23rd of March 1994
003.1,WMagnetic Variation
*6AThe checksum data, always begins with *
VTG - Velocity made good. The gps receiver may use the
LC prefix instead of GP if it is emulating Loran output.
VTG String Example
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*33
where:
VTGTrack made good and ground speed
054.7,TTrue track made good (degrees)
034.4,MMagnetic track made good
005.5,NGround speed, knots
010.2,KGround speed, Kilometers per hour
*33Checksum
ZDA - Data and Time
ZDA String Example
$GPZDA,hhmmss.ss,dd,mm,yyyy,xx,yy*CC
$GPZDA,201530.00,04,07,2002,00,00*6E
Continued on next page
15-18
OUO6050,0000ED9 –19–07NOV07–3/4
121907
PN=26
GS2 Display—StarFire iTC
where:
hhmmssHrMinSec(UTC)
dd,mm,yyyDay,Month,Year
xxlocal zone hours -13..13
yylocal zone minutes 0..59
*CCchecksum
SATELLITE INFORMATION softkey
Press: MENU button >> STARFIRE ITC button >>
SATELLITE INFORMATION softkey.
The StarFire iTC - Satellite Information screen contains
SKY PLOT and GRAPH tabs.
PC8663 –UN–05AUG05
PC8659 –UN–05AUG05
OUO6050,0000ED9 –19–07NOV07–4/4
MENU button
PC8682 –UN–05AUG05
SATELLITE INFORMATION softkey
Continued on next page
STARFIRE ITC button
OUO6050,0002248 –19–14NOV06–1/4
15-19
121907
PN=27
GS2 Display—StarFire iTC
StarFire iTC - Satellites
A—Sky Plot tabD—Satellites Above ElevationF—Corrections AgeI—PDOP
B—Graph tabMaskG—VDOPJ—Satellites on Sky Plot
C—Satellites in SolutionE—Satellites TrackedH—HDOPK—Satellite Tracking
SKY PLOT tab
– Green – indicates satellite is OK (being used for
corrections)
Illustrates where satellites are in relation to vehicles
receiver. This allows operator to look at satellite
geometry.
• Sky Plot consists of 3 concentric rings depicting 0,
30, and 60 degrees of elevation with directional
crossbar intersection representing 90 degrees of
elevation.
Reading Satellite Sky Plot
• Grey radial lines extending from center of Sky Plot
represent azimuth. They are spaced 30 degrees
• Sky Plot is fixed so that North is always at top.
• Satellites are displayed as their satellite ID number
that correspond to Satellite Tracking Chart located
right of Sky Plot
– Red – indicates satellite is in search mode
– Blue – indicates satellite is being tracked
apart and represent 30 and 60 degrees.
• Directional crossbar representing North, South, East,
and West also represent azimuth at 0, 90, 180, and
270 degrees.
• W1 and W2 (WAAS/EGNOS) satellites and inmarsat
satellites are not shown in Sky Plot.
Continued on next page
OUO6050,0002248 –19–14NOV06–2/4
15-20
PC9711 –UN–10NOV06
121907
PN=28
GS2 Display—StarFire iTC
Satellite Tracking Chart
• SAT ID – (Satellite Identification Number)
Identification number for GPS Satellite.
• ELV – (Position Elevation) Elevation in degrees
above horizon for GPS satellite position
• AZM – (Position Azimuth) Azimuth in degrees from
true North for GPS satellite
• L1 SNR – (L1 Signal to Noise Ratio) Signal strength
for L1 GPS signal (signal to noise ratio)
• L2 SNR – (L2 Signal to Noise Ratio) Signal strength
for L2 GPS signal (signal to noise ratio)
• Status – (GPS Signal Status) Status of GPS signal
– Search – searching for satellite signal
– Track – tracking satellite signal and using it for
positioning
– OK – tracking satellite signal and using it for
positioning
– OK SF1 – Tracking satellite signal and using it for
positioning with STARFIRE single frequency
– OK SF2 – Tracking satellite signal and using it for
positioning with STARFIRE dual frequency
Satellite Tracking Information
Satellite Tracking information is displayed at bottom of
SKY PLOT and GRAPH tabs.
• Satellites in Solution – number of satellites used to
compute position.
• Satellites Above Elevation Mask – total number of
GPS satellites available to receiver that are above 7
degree elevation mask.
• Satellites Tracked – total number of GPS satellites
tracked by receiver.
• Corrections Age (sec) – age of differential correction
signal to GPS (normally less than 10 seconds)
• VDOP – Vertical Dilution of Precision
• HDOP – Horizontal Dilution of Precision
• PDOP – Positional Dilution of Precision is an
indicator of GPS satellite geometry as viewed by
receiver. A lower PDOP indicates better satellite
geometry for calculating both horizontal and vertical
position.
Continued on next page
OUO6050,0002248 –19–14NOV06–3/4
15-21
121907
PN=29
GS2 Display—StarFire iTC
StarFire iTC - Satellites
A—SkyPlotB—GraphC—PDOP
Graph
A graph illustrating L1 and L2 SNR values.
• Bars are colored to satellites current status.
• SNR values (colored bar) should be above dashed
line that runs horizontally across bar graph.
NOTE: ONLY GREEN bars are used in calculation of
PDOP, VDOP, AND HDOP. SNR’s are
considered good if above dashed line.
OUO6050,0002248 –19–14NOV06–4/4
15-22
PC9551 –UN–06NOV06
121907
PN=30
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