UNI TRAQ GT-525 Technical Manual
Technical Manual
GPS Module Series Model: GT-525
Flash version
UniTraQ International Corp. All right reserved, © 2009
2F., No.136, Ziqiang S. Rd., Zhubei City, Hsinchu County 30264, Taiwan (R.O.C.)
TEL：886-3-6578491 FAX：886-3-6578492
MADE IN TAIWAN
UniTraQ International Corp. RoHS compliance.
2009, 04, Version 1.2
Version History
Date Version Description of change Author
2008-09-12 0.1 Original Victor
2009-01-21 1.1
Enhance Warm start performance
Victor
2009-04-06 1.2 Change New Address Julie
UniTraQ International Corp. RoHS compliance.
2009, 04, Version 1.2
Contents
1. Features………………………………………………………………..…………………………………………...1
2. Performance……………………………………………………………………………..…….…..……………….2
2.1 Receiver specification……………………………………………….…………………..…………………..2
2.2 Electric specification…………………………………….……………………………….…………………..3
2.2.1 Pin assignment……………………………………………..…...…………………….…………………..3
2.2.2 Absolute maximum ratings……………...………………………………………..…..………………... 3
2.2.3 DC electrical characteristics………………………………..……………………….…………………..4
2.2.4 GPS status indicator…………………………………...……..…………………………………………..4
2.3 Environment specification……………………….………………………….…….…….…………………..4
3. Communication specification……………………………………………………………….…………………..5
4. Connector…………………………………………………………………………………………………………...5
5. On board patch antenna…………...……………………………………………………………………………..6
6. Mechanic dimension………………………………………………………………………….…………………..7
7. Approved NMEA message…………………………………………….….……..………….……………………8
7.1 GGA – global positioning system fix data…………….………………………….…..…………………..8
7.2 GLL – latitude and longitude, with time of position fix and status……………….………………… ..9
7.3 GSA – GPS DOP and active satellites……………..….….….….…….…..….….………………………10
7.4 GSV – GPS satellite in view………….….….….…..….…..….….….….….….……….………………….11
7.5 RMC – recommended minimum specific GPS/transit data…………...….….…...…………………..12
7.6 VTG – course over ground and ground speed…………….….….……….……..….……………… ….13
7.7 ZDA – time and data…..….….….….….…..….….….….….….….….….…...….….….………………….13
Eastern Star 5 series GT-525
GPS Module
UniTraQ International Corp. RoHScompliance
2009, 04, Version 1.2
1. FEATURES
z
Build on SiRF startIII chipset
z 20 channels All-in-View tracking
z Low power consumption
z 200,000+ effective correlates for very
fast TTFF and high sensitivity
acquisition
z High sensitivity for indoor fixes
z SBAS (WAAS and EGNOS) support
z Reacquisition time 0.1 second
z Build-in a lithium battery make GPS
fast positioning
z 18X18X4 patch antenna
z Compact board size 19X19X11mm for
easy integration onto mobile device
z Build on 18X18X4 patch antenna
z Integrate LNA with low power control
z Average Hot start time under 1sec
z Average Cold start time under 40sec
z RoHS compliance
GT-525
Fast-Acquisition High-Sensitivity
20-Channel GPS Receiver Module
The GT-525 is a compact all-in-one GPS module solution
intended for a broad range of Original Equipment
Manufacturer (OEM) products, where fast and easy system
integration and minimal development risk is required.
The GT-525 is a low-power star performers deliver top-notch
accuracy, -159 dBm tracking, and track all satellites in view,
setting the benchmark for real-time navigation, even through
urban canyons and dense foliage. 200,000+ correlates—for
fast and deep signal searches—into a new power-saving
design, providing makers of portable and wireless devices
with a low-power premium GPS solution
Both the LVTTL-level and RS232 signal interface are
provided on the interface connector of the GT-525. Wide
range power supply voltage form 3.0V to 5.5V is supported.
1
Eastern Star 5 series GT-525
GPS Module
UniTraQ International Corp. RoHS compliance
2009, 04, Version 1.2
2
Eastern Star 5 series GT-525
GPS Module
2. PERFORMANCE
2.1 RECEIVER SPECIFICATIONS
Parameter Specification
Receiver Type 20 channels
Re-acquisition sensitivity -155dBm
Tracking sensitivity -159dBm
Cold start sensitivity -142dBm
Receiver frequency 1575.42MHz
Code C/A code
Accuracy
(1) Horizontal
(2) Velocity
10 meters, 2D RMS
7 meters 2D RMS, WAAS corrected
0.1m/sec
Startup Time
hot start
warm start
cold start
< 1 sec
< 25 sec
< 40 sec
Signal Reacquisition 0.1sec
Update Rate 1Hz (standard)
Operational Limits
(1) Altitude
(2) velocity
< 60,000ft
< 1,000knots
Datum WGS-84(Default)
Protocol NMEA-0183 V2.2
Power supply 3.0V to 5.5VDC
Connector 1.0mm pitch, right angle, 6 pin wafer connector
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