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GM-83
GPS Engine Board
User’s Guide
Jan 02, 2002
Thailand contact:
NavCom Research Co.,Ltd.
84/280 Asiahometown village,Bangkruay-Soinoi rd.,
Sainoi district, Ampher Sainoi,Nontabure 11150
Phone : 662-9237628-29
Fax : 662-92367629
Email : navcom@navcoms.com
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GM-83 User’s manual TABLE OF CONTENTS …………………………………………………………………………..…….. 3 1. Introduction 1.1 Overview ………………………………………………………………………………. 3 1.2 Features …………………………………………………………………………..….. 3 1.3 Technical Specifications ………………..……………………………..……………….. 3 ……………………………………….………………….. 4 2. Operational Characteristics 2.1 Initialization …………………………………………………………………………... 4 2.2 Navigation …………………………………………………………………………… 5 ……………………………………………….……………………….. 6 3. Hardware Interface 3.1 Standard Model ……
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GM-83 User’s manual 1. Introduction 1.1 Overview The HOLUX GM-83 Engine Board is a total solution GPS receiver, designed based on SiRF star II Architecture. This positioning application meets strict needs such as car navigation, mapping, surveying, agriculture and so on. On
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GM-83 User’s manual 1.3.4 Performance 1) Tracks up to 12 satellites. 2) Update rate: 1 second. 3) Acquisition time: Reacquisition 0.1 sec, averaged Hot start 8 sec. averaged Warm start 38 sec. averaged Cold start 45 sec. averaged 4) Position accuracy: Non DGPS (Differential GPS) Position 5~25 meter CEP Velocity 0.1 meters/second. Time 1 microsecond synchronized GPS time DGPS (Differential GPS) Position 1 to 5 meters, typical Velocity 0.05 meters/second, typical EGNOS/WAAS Position < 2.
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GM-83 User’s manual 2.2 Navigation After the acquisition process is complete, the GM-83 sends valid navigation information over output channels. These data include: 1) Latitude/longitude/altitude 2) Velocity 3) Date/time 4) Error estimates 5) Satellite and receiver status 2.3 Manufacturing Default: Datum: WGS84. Baud Rate: 4800. Output: GGA, GSA, GSV, RMC or by demand. DGPS: RTCM SC-104(Type 1,2,9) or WAAS (in USA area) or EGNOS (in European area) 5
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GM-83 User’s manual 3. Hardware interface 3.1 Standard Model GM-83 GM-83-A W/ angle MCX connector and standard hole to hole dimension J1 connector pin definition: Pin # Name Description 1 NC No function
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GM-83 User’s manual Manual reset input, ground to reset receiver. Leave floating for normal 5 PBRESEN operation. The minimum plus width is 150 ms reset signal. 6 GPIO1 General purpose I/O pin 1 7 GPIO2 General purpose I/O pin 2 8 GPIO3 General purpose I/O pin 3 9 GPIO4 General purpose I/O pin 4 10 GND Ground 11 TXA Port A Serial Transmit Data GPS messages. 12 RXA Port A Serial Receive Data GPS commands. 13 GND Ground 14 TXB Port B Serial Transmit Data. 15 RXB Port B Serial Receive Data DGPS mess
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GM-83 User’s manual 4. Software Interface The GM-83 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC interface specification, which is defined in NMEA 0183, Version 2.2 and
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GM-83 User’s manual Value Description 0 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 4.1.2 Geographic Position with Latitude/Longitude(GLL) Table 4-4 contains the values for the following example: $GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C Table 4-4 GLL Data Format Name Example Units Description Message ID $GPGLL GLL protocol header Latitude 3723.2475 ddmm.mmmm N/S Indicator N N/S Indicator N N=north or S=south Lo
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GM-83 User’s manual 33D 4.1.4 GNSS Satellites in View (GSV) Table 4-8 contains the values for the following example: $GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71 $GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41 Table 4-8 GSV Data Format Name Example Units Description Message ID $GPGSV GSV protocol header Number of Messages 2 Range 1 to 3 (1) Message Number(1) 1 Range 1 to 3 Satellites in View 07 Satellite ID 07 Channel 1 (Range 1 to 32) Elevation 79 degrees Channel
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GM-83 User’s manual 4.1.6 Course Over Ground and Ground Speed (VTG) Table 4-10 contains the values for the following example: $GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E Table 4-10 VTG Data Format Name Example Units Description Message ID $GPVTG VTG protocol header Course 309.62 degrees Measured heading Reference T True Course degrees Measured heading Reference M Magnetic(1) Speed 0.13 knots Measured horizontal speed Units N Knots Speed 0.2 km/hr Measured horizontal speed Units K Kilometers per hour Che
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GM-83 User’s manual 5. Earth Datums 5.1 Earth Datums The following is a list of the GM-83 earth datum index and the corresponding earth datum name: Item Datum Reference Ellipsoid Data name 1 Adindan - Ethiopia Clarke 1880 Data1.dat 2 Afgooye - Somalia Krassovsky Data2.dat 3 Alaska, Conus –
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GM-83 User’s manual new software to the Receiver, and configure the Receiver operation. See setup.pdf for more information on the use and operation of SiRFdemo software. 14
