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GPS模块说明书.pdf

发布时间：2022-05-29 发布人：admin 分类：说明书 资料大小：0.72M 资料格式：pdf 举报 版权申诉
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    JCOM
    MODEL NAME
    CUSTOMER
    MODEL NAME
    User programmable setting for baud rate, NMEA & Interval tim
    Output Messages
    Option Description
    Message
    Name
    Value
    GLL-Geographic Position-Latitude/Longitude
    GSA-GNSSDOP and Active Satellites
    GSV-GNSS Satellite in View
    Name
    RMC-Recommended Minimum Specific GNSS Data
    VTG-Course Over Ground and Ground Speed
    Customer Define Message Setting Command
    6. Packing Description
    C3-370B-Jnavi High-Performance GPS Receiver C3-370B Jnavi SPECSHEET JCOM MODEL NAME CODE NO. CUSTOMER MODEL NAME GR – C3-370B - XXXX - T - P C3-370B INVESTIGATION INSPECTION APPROVAL 200 . . . 200 . . . 200 . . . 2006. . . J communications co., Ltd. J communications co., Ltd. 1/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver Contents 1. Functional Description 1.1 Features 1.2 Block Diagram 1.3 Receiver Unit Specifications 1.4 Protocols 2. Interface Specification 2.1 Pin Description 2.2 I/O Pin Command Level 2.3 Serial Interfaces (User programmable setting command) 3. Electrical Specification 3.1 Absolute Maximum Ratings 3.2 Operating Conditions 3.2.1 DC Characteristics 3.2.2 AC Characteristics 3.2.3 RF Input Impedance 4. Performance Specification 4.1 3D Tracking Sensitivity (Level Decrease) 4.2 3D Re-Tracking Sensitivity (Level Increase) 4.3 Temperature & Sensitivity 5. Mechanical Dimension & Pin Description 6. Packing Description J communications co., Ltd. 2/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver 1. Functional Description 1.1 Features Fully self-contained GPS receiver Fully shield Full implementation of SiRFstarTMIII GPS architecture GSC3F(High Performance GPS Single Chip) GPS DSP with integrated real time clock(RTC) ARM7TDMI CPU 4Mbit FLASH memory Low noise amplifiers and SAW filters. TCXO, Reset & Regulator etc Built-In Back-up Battery GPS receiver With Patch Antenna Patch Antenna Size : 25(w)mm X 25(d)mm X 2(h)mm Max. Size : 30.0(w)mm X 27(d)mm X 7.0(h)mm Weight : 10.5 grams 1.2 Block Diagram RTC X-TAL Back-UP LNA Filter GSC3F SAW Line Filter TCXO RESET Regulator IC J communications co., Ltd. 3/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver 1.3 Receiving Unit Specifications Receiver type : L1 frequency, C/A Code, 20-channel Max up-date rate : 1 sec Accuracy (SA off) : Position < 10m 3DRMS 3D Tracking Sensitivity : -156dBm at the receiver input(typical) Operational Limits : Altitude < 18,000m (60,000ft) Velocity < 515m/s (1,000knots) Time To First Fix (TTFF) a) Cold Start 60sec (typical) In a ‘Cold Start’ scenario, the receiver has no knowledge of position, time or the satellite constellation. The receiver starts to search for signals blindly. Cold start time is the longest startup for this module b) Warm Start 40sec (typical) In a ‘Warm Start’ scenario, due to a backup battery the receiver knows its last poison, the approximate time and the constellation almanac. Thanks to this it can quickly acquire satellites and gat a position fix faster then in ‘Cold Start’ mode. c) Hot Start < 3sec (typical) In a ‘Hot Start’ scenario, the receiver has been powered off for less then 2 hours since the last valid navigation solution. The GPS uses its last Ephemeris data to calculate a position fix. Re-acquisition time 5sec typical (within 60sec GPS signal obstruction) 1.4 Protocols NMEA 0183 (default) 9600bps Activated message : GGA,GSA,GSV, RMC all with checksum enabled User programmable setting for baud rate, NMEA & Interval time by user define message setting Command. (see 2.3 Serial Interface Setting) J communications co., Ltd. 4/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver Output Messages Table 1-1 lists each of the NMEA output messages specifically developed and defined by SiRF for use within SiRF products. Table 1-1 NMEA Output Message Description Option GGA GLL GSA GSV RMC VTG 150 OK to send message. Time, position and fix type data. Latitude, longitude, UTC time of position fix and status. GPS receiver operating mode, satellites used in the position solution, and DOP values. The number of GPS satellites in view satellite ID numbers, elevation, azimuth, and SNR values Time, date, position, course and speed data. Course and speed information relative to the ground. A full description and definition of the listed NMEA messages are provided by the next sections of this chapter. Table 1-2 provides a summary of supported SiRF NMEA output messages by the specific SiRF platforms. Table 1-2 Supported NMEA Message SiRF Software Options GGA GLL GSA GSV RMC VTG Yes Yes Yes Yes Yes Yes J communications co., Ltd. 5/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver GGA ―Global Positioning System Fixed Data Table 1-3 contains the values for the following example: $GPGGA, 161229,487,3723,2475,N,12158,3416,W,1.07,1.0,9.0,M….0000*18 Table 1-3 GGA Data Format Name Example Units Description Message ID UTC Time Latitude N/S Indicator Longitude E/W Indicator Position Fix Indicator Satellites Used HDOP MSL Altitude Units Geoid Separation Units Age of Diff. Corr. Diff. Ref. Station ID Checksum $GPGGA 161229,487 3723,2475 N 12158,3416 W I 07 1.0 9.0 M M 0000 *18 Table 1-4 Position Fix Indicator Meters Meters Meters Meters Second GGA protocol header hhmmss,sss ddmm,mmmm N-north or s-south dddmm,mmmm E=east or W=west See Table 1-4 Range 0 to 12 Horizontal Dilution of Precision Null fields when DGPS is not used End of message termination Description Value 0 1 2 3-5 6 Fix not available or invalid GPS SPS Mode, fix valid Differential GPS, SPS Mode, fix valid Not supported Dead Reckoning Mode, fix valid Note – A valid position fix indicator is derived from the SiRF Binary M.I.D. 2position mode1 See the SiRF Binary Reference Manual J communications co., Ltd. 6/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver GLL-Geographic Position-Latitude/Longitude Table 1-5 contains the values for following example: $GPGLL, 3723.2475,N,12158.3416,W,161229.487,A,A*41 Table 1-5 GLL Data Format Name Example Units Description Message ID $GPGLL Latitude 3723.2475 N/S Indicator N Longitude 12158.3416 E/W Indicator W UTC Time 161229.487 Status Mode Checksum A A *41 GLL protocol header ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west hhmmss.sss A= data valid or V=data not valid A=Autonomous, D=DGPS, E=DR End of message termination J communications co., Ltd. 7/19 Ver: 1.0 www.jcomco.com
    C3-370B-Jnavi High-Performance GPS Receiver GSA-GNSSDOP and Active Satellites Table 1-6 contains the values for the following example: $GPGSA,A,3, 07,02,26,27,09,04,15,,,,,,,,1.8,1.0,1.5*33 Table 1-6 GSA Data Format Name Message ID Mode 1 Mode 2 1 Satellite Used 1 Satellite Used …. 1 Satellite Used PDOP HDOP VDOP Checksum Example Units Description $GPGSA A 3 07 02 1.8 1.0 1.5 *33 GSA protocol header See Table 1-7 See Table 1-8 Sv on Channel 1 Sv on Channel 2 …. Sv on Channel 12 Position Dilution of Precision Horizontal Dilution of Precision Vertical Dilution of Precision End of message termination 1. Satellite used in solution Table 1-7 Mode 1 Value M A Table 1-8 Mode 2 Value Description Manual-forced to operate in 2D or 3D mode 2Dautomatic-allowed to automatically switch 2D/3D Description 1 2 3 Fix not Available 2D(<4SV’s used) 3D(>3SV’s used) J communications co., Ltd. 8/19 Ver: 1.0 www.jcomco.com
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