USB Dongle Series Model:UD-731N
GPS USB Dongle Series Model:UD-731N
UD-731N
User’s Manual
UniTraQ International Corp. All right reserved, © 2011
2F., No.136, Ziqiang S. Rd., Zhubei City, Hsinchu County 30264, Taiwan (R.O.C.)
TEL：886-3-6578491 FAX：886-3-6578492
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MADE IN TAIWAN
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USB Dongle Series Model:UD-731N
Contents
1. Introduction………………..………………………………………………………….………….3
2. Package contents……………………………………………………………………….……….3
3. System requirements…………………………………………………………………………...3
4. Features………………………..……………………………………………………………….…3
5. Specifications………………………………………………………………………………….…4
5.1 Electronic Characteristics……………………………………………………… …………..4
5.2 Physical Characteristics…………………………………………………………………….5
6. Getting started…………………………………………………………………………………...6
6.1 LED Status……………………………………………………………………………….……6
7. Operations………………………………………………………………………………………..7
7.1 Overview……………………………………………………………………………………….7
7.2 Install USB Driver…………………………………………… ……………………………..7-9
7.3 Device Manage Confirmation and Memory Usage……………………………………..9
8. Application Software Introduction…………………………………………………………..10
8.1 u-Center……….……………………………………………………………………………...10
8.1.1 Features….……………………………………………………………………………...10
8.1.2 Starting u-center…………………………………………………………………….....11
8.1.3 Configuring the Serial Connection……………………………………………...11-12
8.1.4 Main Frame……………………………………………………………………….....12-13
9. Trouble Shooting………………………………………………………………………….…...14
10. Approved NMEA Message…………………………………………………………… ……….15
10.1 GGA–GLOBAL POSITIONING SYSTEM FIX DAT A …..…………………………..15-16
10.2 GLL-LATITUDE AND LONGITUDE, WITH TIME OF POSITION FIX AND
STATUS…………………………………………………………………………………..16-17
10.3 GSA - GPS DOP AND ACTIVE SATELLITES ……………………………………........18
10.4 GSV - GPS SATELLITE IN VIEW ………………………………………………………..19
10.5 RMC - RECOMMANDED MINIMUM SPECIFIC GPS/TRANSIT DA TA ………….20-21
10.6 VTG - COURSE OVER GROUND AND GROUND SPEED …………………………..22
10.7 ZDA - TIME AND DATA….……………..………………………………………..………..23
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USB Dongle Series Model:UD-731N
1. Introduction
The UD-731N is a USB Dongle with GPS receiver and built-in NAND FLASH memory
together. Users can utilize it for navigation and mem ory storage application. Its 50 parallel
channels and u-blox 5 chip which provide short start-up time and fast signal acquisition.
Having fast time-to-first-fix and high sensitivity, the UD-731N offers good navigation
performance even in urban canyons.
The UD-731N is built in with NAND FLASH memory for users to utilize it for memory
storage. The navigation software can also install in the built-in memory to support full
navigation function with GPS receiver in the same device. It is compact and easily used
with your laptop or mini notebook.
2. Package Contents
UD-731N ………….. x 1
CD-ROM ……………x 1
USB cable……...……x 1
3. System Requirements
The UD-731N requires the minimum to run on a laptop:
Operating System: Windows 2000 / XP/Vista, Windows 7
CPU: 500 MHz, Pentium III
System Memory: 128MB RAM
Hard Disk: 50MB free space
4. Features
50 channel to acquire and track satellites simultaneously
Built in NAND FLASH memory
Industry-leading TTFF speed
Signal detection better than -160 dBm
SBAS (WAAS/EGNOS/MSAS) capable
Cold start 29seconds
Hot start < 1second
USB Interface
Accuracy 2.5m CEP
Easy-plug-in Notebook
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5. Specifications
5.1 Electronic Characteristics
Parameter Specification
Receiver Type 50 channels
Re-acquisition sensitivity -160dBm
Tracking sensitivity -160dBm
Cold start sensitivity -145dBm
Receiver frequency 1575.42MHz
Code C/A code
Accuracy
(1) Position
(2) Velocity
Startup Time
hot start
warm start
cold start
Signal Reacquisition <1s
Max navigation update rate 4Hz
Operational Limits
(1) Altitude
(2) velocity
Dynamics
Datum WGS-84
Protocol NMEA-0183 V2.3
Serial Interface USB interface
2.5m CEP
0.1m/sec
< 1 sec
29 sec
29 sec
50000 m
500m/s
≦4G (39.2m/sec2)
Input Voltage 5V ±5%
Power Consumption Tracking: 150 mA
Connector USB B-type 4P male
FLASH memory 2 or 4GB (optional)
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5.2 Physical Characteristics
Parameter Specification
Physical dimension 78.62mm X 24.83mm X 11.15mm
Weight 22+-10%g
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USB Dongle Series Model:UD-731N
6. Getting Started
There are only few simple steps that you need to follow before using your UD-731N:
Install the USB driver onto your laptop using the included CD-ROM .
Plug the GPS receiver into your laptop’s USB port and assign the COM port. From
within your mapping or navigation software (including the supplied GPS
Application utility), you will need to manually configure the COM port that was
assigned to the UD-731N GPS receiver by operation system so that proper
communication between the GPS receiver and a mapping progra m can occur.
Most software requires that you manually configure the COM port setting for any
GPS device being used.
6.1 LED Status
The LED flash status:
RED LED :
1. Continue ON: GPS acquisition
2. 900ms on/ 100ms off : GPS tracking
GREEN LED :
Continue ON: while USB dongle plug into PC
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USB Dongle Series Model:UD-731N
7. Operations
7.1 Overview
UD-731N is an easy to use device with GPS receiver and memory built-in together. After
you install the USB driver on the computer or laptop, both GPS receiver and maeory can
work with the computer or laptop normally.
7.2 Install USB Driver
The USB driver category depends on your operating system, such as WINDOWS
Vista/XP/2000, WINDOWS 7, and WINCE. Please select the right one from the CD and
then follow the procedures illustrated below to install USB driver.
A. Click on the driver file to start.
B. Review the license agreement information, and select I Agree to accept the licensing
terms, and then click on Next to continue. You may click on Back to go to the previous
step, or Cancel to quit.
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C. The driver is on Installing
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D. On the next dialogue, click Finish to complete driver installation
7.3 Device Manage Confirmation and Memory Usage:
Plug UD-731N into PC, the GPS COM port will appear in Device Manage. At the same time
the Removable Disk will appear, therefore you can click OK button to utilize storage memory.
GPS COM port
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USB Dongle Series Model:UD-731N
8. Application Software Introduction
8.1 u-Center
The u-Center application software is provides by u-blox to support the devices with their
GPS chipset built-in. This section describes the simple and quick user guides to this useful
program. Please refer to the user manual of this software for more details.
8.1.1 Features
u-center evaluation software provides system integrators and end users with a quick and
simple way to interface with u-blox GPS chipsets, modules and boards. It enables easy
evaluation, performance testing, development and debugging of GPS receivers. u-center
allows easy connection to u-blox products and provides a suite of features to view, log, and
analyze performance. The features include:
Support for u-blox’ latest receivers using u-blox 5 positioning technology. u-center can
communicate with these receivers using either the UBX protocol, or the NMEA-0183
standard protocol.
Support for receivers that utilize standard NMEA strings.
u-center presents all the information collected during the operation of the GPS receiver.
All aspects of GPS data (position, velocity, time, satellite tracking, etc.) can be monitored
and logged under various test scenarios for the evaluation of a receiver. u-center
software allows analysis of the collected data in order to investigate performance issues
such as accuracy, road test position and trajectory, satellite tracking, time to first fix, etc.
All processed data can be captured in ASCII format and ported into popular
spreadsheets for creating additional plots and statistics.
Camera View: photographic data can be stored in the log file together with the navigation
data and later be replayed in the application.
Export data files to Google Earth and Google Maps.
Supports AssistNow Online and AssistNow Offline.
Data recording and playback function.
Structural and graphical data visualization in realtime.
Cut and paste export to standard PC application software.
Docking views (real-time cockpit instruments): Satellite constellation, compass, clock,
altimeter, speedometer, GPS and satellite information views.
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8.1.2 Starting u-center
After a successful installation, u-center will start up as shown in Figure 1:
Figure 1: Start Display
8.1.3 Configuring the Serial Connection
When u-center is started for the first time, the COM port needs to be initialized. u-center
supports the COM-Settings listed below and all u-blox GPS receivers are pre-configured
this way.
Parity: None Data Bits: 8 Stop Bits: 1 Flow Control: none
Press the arrow in the Connect/Disconnect-Button and select the used COM-Port.
As soon as u-center is synchronized to the GPS receiver, the
Connect/Disconnect-Button on the Receiver Tool Bar changes the color to green and the
display shows information about the satellite constellation, signal to noise ratio, time etc.
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USB Dongle Series Model:UD-731N
Figure 2: Start Display after a successful connection
8.1.4 Main Frame
The Main Frame is the primary display screen of u-center. It displays all tool ba rs and
some of the information provided by the GPS receiver. In the status bar, information about
communication, UTC time, Operating Time, used protocol (NMEA or UBX), used file, etc.
is shown.
Button Function: A description about each button in the tool bars can be obtained by
holding the mouse cursor over the button for a few seconds. A Tool Tip message will
appear near the Icon with additional information while a detailed description is displayed
in the Status Display.
Status Display: display the current action or the function of a button if the mouse cursor
is over the button
u-blox 5 / Antaris Mode: u-center automatically detects the type of GPS receiver
connected and activates the appropriate mode of operation in order to take optimal
advantage of the features. The mode can also be manually selected through the menu
bar.
File in use: As soon as a file is used (this file must first be opened) the name of the file
will be displayed (xxxxxx.ubx).
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Protocol Information: This box indicates the current message set that is being used to
communicate with the GPS receiver. This can be the NMEA-0183 standard or the UBX
protocol. The UBX protocol provides more extensive information with the receiver.
u-center can handle both protocols.
Operating Time: The time elapsed since you started u-center
UTC Time: The current time sent by the GPS receiver
Communication Information: Shows the active COM port and baudrate.
Color-Coding of this icon:
Green: data is being received at the correct baudrate
Dark Green: the last data received was valid, but there is no data to collect at this time.
Red: data is being received but errors are detected
Dark Red: no data is being received but errors have been detected in the past
Gray: waiting for first data
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USB Dongle Series Model:UD-731N
9. Trouble Shooting
Satellite signal problem
The following situations are normally if you find the GPS satellite signal is very low or
absolute missing:
There is something cover above.
While you are in a tunnel.
Inside of the building.
Near by buildings.
Put GPS receiver inside the car, some of the sun-control film with metal that
makes microwave can not be radiate.
GPS not fix problem
If you see “GPS not fix” message on the screen after you enable the UD-731N GPS
receiver, please consider the possible problems below:
Wait few minutes. GPS position may cost several minutes.
Make sure the UD-731N GPS receiver is put on a proper place. Some
sun-control film for car may cutoff the satellite signal. You may replace it and try
again.
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USB Dongle Series Model:UD-731N
10. APPROVED NMEA MESSAGE
The serial interface protocol is based on the National Marine Electronics Association’s NMEA
0183 ASCII interface specification. This standard is fully define in “NMEA 0183, Version 2.3”
The standard may be obtained from NMEA, www.nmea.org
10.1 GGA – GLOBAL POSITIONING SYSTEM FIX DATA
Time, position and fix related data for a GPS receiver.
Structure:
$GPGGA,hhmmss.sss,ddmm.mmmmm,a,dddmm.mmmmm,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF
>
1 2 3 4 5 6 7 8 9 10 1 1 12 13
Example:
$GPGGA,060932.448,2447.09599,N,12100.52049,E,1,08,1.1,108.7,M,,,,0000*0E<CR><LF>
Field Name Example Description
1 UTC Time 060932.448 UTC of position in hhmmss.sss format, (000000.00 ~
235959.99)
2 Latitude 2447.09599 Latitude in ddmm.mmmmm format ddmm.mmmmm
Leading zeros transmitted
3 N/S Indicator N Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South
4 Longitude 12100.52049 Longitude in dddmm.mmm mm format
Leading zeros transmitted
5 E/W Indicator E Longitude hemisphere indicator, 'E' = East, 'W' = West
6 GPS quality
indicator
1 GPS quality indicator
0: position fix unavailable
1: valid position fix, SPS mode
2: valid position fix, differential GPS mode
3: GPS PPS Mode, fix valid
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4: Real Time Kinematic. System used in RTK mode with
fixed integers
5: Float RTK. Satellite system used in RTK mode. Floating
integers
6: Estimated (dead reckoning) Mode
7: Manual Input Mode
8: Simulator Mode
7 Satellites Used 08 Number of satellites in use, (00 ~ 12)
8 HDOP 1.1 Horizontal dilution of precision, (00.0 ~ 99.9)
9 Altitude 108.7 mean sea level (geoid), (-9999.9 ~ 17999.9)
10 Geoid Separation Geoid separation in meters according to WGS-84 ellipsoid
(-999.9 ~ 9999.9)
11 DGPS Age Age of DGPS data since last valid RTCM transmission in
xxx format (seconds)
NULL when DGPS not used
12 DGPS Station ID 0000 Differential reference station ID, 0000 ~ 1023
NULL when DGPS not used
13 Checksum 0E
Note: The checksum field starts with a ‘*’ and consists of 2 characters representing a hex
number. The checksum is the exclusive OR of all characters between ‘$’ and ‘*’.
10.2 GLL - LATITUDE AND LONGITUDE, WITH TIME OF POSITION FIX
AND STATUS
Latitude and longitude of current position, time, and status.
Structure:
$GPGLL,ddmm.mmmmm,a,dddmm.mmmmm,a,hhmmss.sss,A,a*hh<CR><LF>
1 2 3 4 5 6 7 8
Example:
$GPGLL,4250.55899,S,14718.50849,E,092204.999,A,A*2D<CR><LF>
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Field Name Example Description
1 Latitude 4250.55899 Latitude in ddmm.mmmmm format
Leading zeros transmitted
2 N/S Indicator S Latitude hemisphere indicator
‘N’ = North
‘S’ = South
3 Longitude 14718.50849 Longitude in dddmm.mmmmm format
Leading zeros transmitted
4 E/W Indicator E Longitude hemisphere indicator
'E' = East
'W' = West
5 UTC Time 092204.999 UTC time in hhmmss.sss format (000000.00 ~ 235959.99)
6 Status A St atus, ‘A’ = Data valid, ‘V’ = Data not valid
7 Mode Indicator A Mode indicator
‘N’ = Data not valid
‘A’ = Autonomous mode
‘D’ = Diffe rential mode
‘E’ = Estimated (dead reckoning) mode ‘M’ = Manual input
mode
‘S’ = Simulator mode
8 Checksum 2D
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10.3 GSA - GPS DOP AND ACTIVE SATELLITES
GPS receiver operating mode, satellites used in the navigation solution reported by the GGA
or GNS sentence and DOP values.
Structure:
$GPGSA,A,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF>
1 2 3 3 3 3 3 3 3 3 3 3 3 3 4 5 6 7
Example:
$GPGSA,A,3,01,20,19,13,,,,,,,,,40.4,24.4,32.2*0A<CR><LF>
Field Name Example Description
1 Mode A Mode
‘M’ = Manual, forced to operate in 2D or 3D mode ‘A’ =
Automatic, allowed to automatically switch 2D/3D
2 Mode 3 Fix type
1 = Fix not available
2 = 2D
3 = 3D
3 Satellite used 1~12 01,20,19,13,,,,,
,,,,
4 PDOP 40.4 Position dilution of precision (00.0 to 99.9)
5 HDOP 24.4 Horizontal dilution of precision (00.0 to 99.9)
6 VDOP 32.2 Vertical dilution of precision (00.0 to 99.9)
7 Checksum 0A
Satellite ID number, 01 to 32, of satellite used in solution,
up to 12 transmitted
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10.4 GSV - GPS SATELLITE IN VIEW
Number of satellites in view , PRN number, elevation angle, azimuth angle, and C/No. Four
satellites details
are transmitted per message. Additional satellite in view information is send in subsequent
GSV messages.
Structure:
$GPGSV,x,x,xx,xx,xx,xxx,xx,…,xx,xx,xxx,xx *hh<CR><LF>
1 2 3 4 5 6 7 4 5 6 7 8
Example:
$GPGSV,3,1,09,28,81,225,41,24,66,323,44,20,48,066,43,17,45,336,41*78<CR><LF>
$GPGSV,3,2,09,07,36,321,45,04,36,257,39,11,20,050,41,08,18,208,43*77<CR><LF
Field Name Example Description
1 Number of message 3 Total number of GSV messages to be transmitted (1-3)
2 Sequence number 1 Sequence number of current GSV message
3 Satellites in view 09 Total number of satellites in view (00 ~ 12)
4 Satellite ID 28 Satellite ID number, GPS: 01 ~ 32, SBAS: 33 ~ 64 (33 =
PRN120)
5 Elevation 81 Satellite elevation in degrees, (00 ~ 90)
6 Azimuth 225 Satellite azimuth angle in degrees, (000 ~ 359 )
7 SNR 41 C/No in dB (00 ~ 99)
Null when not tracking
8 Checksum 78
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10.5 RMC - RECOMMANDED MINIMUM SPECIFIC GPS/TRANSIT DATA
Time, date, position, course and speed data provided by a GNSS navigation receiver.
Structure:
$GPRMC,hhmmss.sss,A,dddmm.mmmmm,a,dddmm.mmmmm,a,x.x,x.x,ddmmyy,x.x,a,a*hh<CR><L
F>
1 2 3 4 5 6 7 8 9 10 11 12 13
Example:
$GPRMC,092204.999,A,4250.55899,S,14718.50849,E,0.00,89.68,211200,,A*25<CR><LF>
Field Name Example Description
1 UTC time 092204.999 UTC time in hhmmss.sss format (000000.00 ~
235959.999)
2 Status A Status
‘V’ = Navigation receiver warning
‘A’ = Data Valid
3 Latitude 4250.55899 Latitude in dddmm.mmmmm format
Leading zeros transmitted
4 N/S indicator
N/S
5 Longitude 14718.5084 Longitude in dddmm.mmmmm format
6 E/W Indicator E Longitude hemisphere indicator
S Latitude hemisphere indicator
‘N’ = North
‘S’ = South
Leading zeros transmitted
'E' = East
'W' = West
7 Speed over ground 000.0 Speed over ground in knots (000.0 ~ 999.9)
8 Course over ground 000.0 Course over ground in degrees (000.0 ~ 359.9)
9 UTC Date 211200 UTC date of position fix, ddmmyy format
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10 Magnetic variation Magnetic variation in degrees (000.0 ~ 180.0)
11 Magnetic Variation Magnetic variation direction
‘E’ = East
‘W’ = We st
12 Mode indicator A Mode indicator
‘N’ = Data not valid
‘A’ = Autonomous mode
‘D’ = Diffe rential mode
‘E’ = Estimated (dead reckoning) mode
‘M’ = Manual input mode
‘S’ = Simulator mode
13 checksum 25
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USB Dongle Series Model:UD-731N
10.6 VTG - COURSE OVER GROUND AND GROUND SPEED
The Actual course and speed relative to the ground.
Structure:
GPVTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh<CR><LF>
1 2 3 4 5 6
Example:
$GPVTG,89.68,T,,M,0.00,N,0.0,K,A*5F<CR><LF>
Field Name Example Description
1 Course 89.68 Tru e cou rse o ver gro und in degrees (00 0 .0 ~ 359.9)
2 Course
3 Speed 0.00 Speed over ground in knots (000.0 ~ 999.9)
4 Speed 0.00
5 Mode A
6 Checksum 5F
Magnetic course over ground in degrees (000.0 ~
359.9)
Speed over ground in kilometers per hour (0000.0 ~
1800.0)
Mode indicator
‘N’ = not valid
‘A’ = Autonomous mode
‘D’ = Different ial mode
‘E’ = Estimated (dead reckoning) mode
‘M’ = Manual input mode
‘S’ = Simulator mode
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10.7 ZDA -TIME AND DATA
Structure:
$GPRMC,hhmmss.sss,dd,mm.yyyy, , ,xxx<CR><LF>
1 2 3 4 5 6 7
Example:
$GPZDA,104548.04,25,03,2004,,*6C<CR><LF>
Field Name
1 UTC time 104548.04 UTC time in hhmmss.ss format, 000000.00 ~ 235959.99
2 UTC time: day 25 UTC time: day (01 ... 31)
3 UTC time: month 03 UTC time: month (01 ... 12)
4 UTC time: year 2004 UTC time: year (4 digit year)
5 Local zone hour
6 Local zone minutes
7 6C 6C Checksum
Example Description
Not being output by the receiver (NULL)
Not being output by the receiver (NULL)
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USB Dongle Series Model:UD-731N
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2F., No.136, Ziqiang S. Rd., Zhubei City, Hsinchu County 30264, Taiwan (R.O.C.)
TEL：886-3-6578491 FAX：886-3-6578492
Email support@unitraq.com
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