User Manual

ManualsBrandsSparkFun Electronics ManualsDevelopment Boards & KitsGP-20U7 GPS Receiver

1. Introduction

1.1 Over view

GP-20U7 is a GPS receiver build-in high performances -165dBm GPS chipset. GP-20U7 provides

customer high position, velocity and time accuracy performances as well as high sensitivity and tracking

capabilities. Customers benefit from the strength of both companies. Thanks to the low power consumption

technology, the GPS receiver is ideal for many portable applications such as PDA, Tablet PC, smart phone

etc.

1.2 Feature

 Build on high performance GPS single chip

 High Sensitivity -163 dBm

 Low power consumption: Max 40mA@3.3V

 Integrated LNA with low-gain mode for active antenna option

 56 channels in Search mode and 22 channels "All-in-View" tracking

 Up to 60,000 simultaneous search windows for fast TTFF and high sensitivity acquisitions

 Average cold start time under 29seconds(open sky)

 Support standard NMEA-0183 and UBLOX protocol

 Patch Antenna Size:18.4(w)mmX18.4(d)mmX4(h)mm

 RoHS compliant (Lead-free)

Summary of content (10 pages)

PAGE 1
. Introduction 1.1 Over view GP-20U7 is a GPS receiver build-in high performances -165dBm GPS chipset. GP-20U7 provides customer high position, velocity and time accuracy performances as well as high sensitivity and tracking capabilities. Customers benefit from the strength of both companies. Thanks to the low power consumption technology, the GPS receiver is ideal for many portable applications such as PDA, Tablet PC, smart phone etc. 1.
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1.3 Product Application  Handheld GPS receiver application  Ideal for PDA, Pocket PC and other consumer devices requiring Positioning capability  Geographic Surveying  Sports and Recreation  Marine Navigation, Fleet Management  Automotive application  Car navigation and tracking  AVL and Location-Based Services  Timing application 1.4 Product Picture 2 Technical Specifications 2.1 General Characteristics 2.1.1 General Frequency L1, 1575.42 MHz C/A code 1.
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2.1.2 Accuracy Position 2.5m CEP Velocity 0.1 m/s WGS-84 Default WGS84 2.1.3 Datum 2.1.4 Time To First Fix （TTFF） Hot start <1sec., average Warm start <28sec., average Cold start <29sec., average 2.1.5 Sensitivity Tracking Sensitivity -165dBm, typical Acquisition Sensitivity -148dBm, typical for cold start 2.1.6 Dynamic condition Altitude 18000m(Max) Velocity 515m/s(Max) Acceleration 4g Jerk 1g/s 2.2 Electrical Characteristics 2.2.1 DC Power Voltage +3.
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2.2.2 Serial Port Electrical Interface Two full duplex serial communication Baud rate 9.6K（Default） Navigation update rate 1Hz Protocol Message NMEA-0183 Ver 3.01 2.2.3 Antenna Type Active patch antenna Center Frequency 1575.42 +/-1.032MHz Polarization RHCP Impedance 50 Ohm 2.3 Environmental Characteristics Operating range -40°C ~ +85°C Storage range -40°C ~ +150°C Relative Humidity 5% ~ 80% 2.4 Physical Characteristics Length 18 mm Width 18 mm Height 7.1 mm 2.
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3 Software Interface 3.1 NMEA V3.01 Protocol Its output signal level is TTL: 9600bps (default), 8 bit data, 1 stop bit and no parity. It supports the following NMEA-0183 Messages: GGA, GLL, GSA, GSV, RMC and VTG. NMEA Output Messages: the module board outputs the following messages as shown in Table.
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Precision MSL Altitude 9.0 meters Units M meters Geoid Separation meters Units M meters Null fields when DGPS is Age of Diff. Corr. second not used Diff. Ref. Station ID 0000 Checksum *18 ＜CR＞＜LF＞ End of message termination Table 2-1 Position Fix Indicator Value Description 0 Fix not available or invalid 1 GPS SPS Mode,fix valid 2 Differential GPS,SPS Mode,fix valid 3 GPS PPS Mode,fix valid 3.1.
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Checksum *2C ＜CR＞＜LF＞ End of message termination 3.1.3 GSA-GNSS DOP and Active Satallites Table 4 contains the values of the following example: $GPGSA, A, 3, 07, 02, 26, 27, 09, 04, 15, , , , , , 1.8,1.0,1.5*33 Table 4 GSA Data Format Name Example Message ID Units $GPGSA Description GSA protocol header Mode 1 A See Table 4-2 Mode 2 3 See Table 4-1 Satellite Used 07 Sv on Channel 1 Satellite Used 02 Sv on Channel 2 … … Satellite Used Sv on Channel 12 PDOP 1.
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3.1.
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Status A=data valid or V=data not valid A Latitude 3723.24756 N/S Indicator Longitude ddmm.mmmm N N=north or S=south 12158.34162 E/W Indicator ddmm.mmmm W E=east or W=west Speed Over Ground 0.13 knots Course Over Ground 309.62 degrees Date 120598 dBHz Magnetic Varation Ture ddmmyy E=east or W=west Checksum *10 ＜CR＞＜LF＞ End of message termination 3.1.6 VTG-Course Over Ground and Ground Speed Table 7 contains the values of the following example: $GPVTG, 309.62, T, , M, 0.13, N, 0.
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manufacture variable connector cable to suit your demands. Like USB, PHR(JST), GHR(JST), Molex, PS2, RJ11, D -Sub 9..etc. You provide me specification, we manufacture the cable and connector. Definition of Pin assignment 1 2 3 Pin No. Pin name I/O 4 Description Remark 1 RX P UART Serial Data Input RXD 2 TX I UART Serial Data Output TXD 3 GND O Ground GND 4 VCC G Power Supply 3-5V www.adh-tech.com.tw sales@adh-tech.com.