User manual HOLUX GR-90

[. . . ] 2 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! 1. Introduction The GR-90 series consists of SiRF GSC2x chipsets technology, LNA and proprietary software. The system function block is described as follows. GPS Antenna CMOS 3V RX TX signal GSC2x filter LNA HOLUX GR-90 is a high performance, low power consumption, small size, very easy integrated GPS engine board designed for a broad spectrum of OEM system applications. This product is based on the proven technology found in other HOLUX 12 channel GPS receivers and SiRF GSC2x chipset solution. [. . . ] After a position fix has been calculated, information about valid position, velocity and time is transmitted over the output channel. The GR-90 utilizes initial data, such as last stored position, date, time and satellite orbital data, to achieve maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital data is obsolete, it may take more time to achieve a navigation solution. The GR-90 auto-locate feature is capable of automatically determining a navigation solution without intervention from the host system. However, acquisition performance can be improved as the host system initializes the GR-90 in the following situation: Moving further than 500 kilometers. Failure of Data storage due to the inactive internal memory battery. 4. 1 NMEA Transmitted Messages The default communication parameters for NMEA output are 4800 baud, 8 data bits, stop bit, and no parity. Table 4-1 NMEA-0183 Output Messages NMEA Record GPGGA GPGLL GPGSA GPGSV GPRMC Description Global positioning system fixed data Geographic position- latitude/longitude GNSS DOP and active satellites GNSS satellites in view Recommended minimum specific GNSS data HOLUX Technology, Inc. 7 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! GPVTG GPMSS GPZDA Course over ground and ground speed Radio-beacon Signal-to-noise ratio, signal strength, frequency, etc. PPS timing message (synchronized to PPS) 4. 1. 1 Global Positioning System Fix Data (GGA) Table 4-2 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 4-2 GGA Data Format Name Message ID UTC Time Latitude N/S Indicator Longitude E/W Indicator Position Fix Indicator Satellites Used HDOP MSL Altitude (1) Units Geoid Separation(1) Units Age of Diff. Station ID Checksum <CR> <LF> 0000 *18 End of message termination M Example Units Description GGA protocol header hhmmss. sss ddmm. mmmm N=north or S=south dddmm. mmmm E=east or W=west See Table 5-3 Range 0 to 12 Horizontal Dilution of Precision $GPGGA 161229. 487 3723. 2475 N 12158. 3416 W 1 07 1. 0 9. 0 M Meters Meters Meters Meters second Null fields when DGPS is not used (1). Values are WGS84 ellipsoid heights. Table 4-3 Position Fix Indicator Value Description 0 1 2 0 Fix not available or invalid GPS SPS Mode, fix valid Differential GPS, SPS Mode, fix valid HOLUX Technology, Inc. 8 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! 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 Message ID Latitude N/S Indicator Longitude E/W Indicator UTC Position Status Checksum <CR> <LF> Example Units Description GLL protocol header ddmm. mmmm N/S Indicator N N=north or S=south dddmm. mmmm E=east or W=west hhmmss. sss A=data valid or V=data not valid End of message termination $GPGLL 3723. 2475 N 12158. 3416 W 161229. 487 A *2C 4. 1. 3 GNSS DOP and Active Satellites (GSA) Table 4-5 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 4-5 GSA Data Format Name Message ID Mode 1 Mode 2 Satellite Used(1) Satellite Used(1) . . . . . . Satellite Used(1) PDOP HDOP VDOP 1. 8 1. 0 1. 5 Example Units Description GSA protocol header See Table 5-6 See Table 5-7 Sv on Channel 1 Sv on Channel 2 . . . . Sv on Channel 12 Position Dilution of Precision Horizontal Dilution of Precision Vertical Dilution of Precision $GPGSA A 3 07 02 HOLUX Technology, Inc. 9 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! Checksum <CR> <LF> 1. 11 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! Message ID Course Reference Course Reference Speed Units Speed Units Checksum <CR> <LF> $GPVTG 309. 62 T M 0. 13 N 0. 2 K *6E km/hr knots VTG protocol header degrees Measured heading True degrees Measured heading Magnetic(1) Measured horizontal speed Knots Measured horizontal speed Kilometers per hour End of message termination (1). All "course over ground" data are geodetic WGS84 directions. 4. 1. 7 MSK Receiver Signal (MSS) Table 4-11 contains the values for the following example: $GPMSS, 55, 27, 318. 0, 100, *66 Table 4-11 MSS Data Format Name Message ID Signal Strength Signal-to-Noise Ratio Beacon Frequency Beacon Bit Rate Checksum <CR> <LF> Example Units Description protocol header dB SS of tracked frequency SNR of tracked frequency Currently tracked frequency 100 bits per second End of message termination $GPMSS 55 27 318. 0 100 66 MSS dB dB kHz Note ­ The MSS NMEA message can only be polled or scheduled using the MSK NMEA input message. 4. 1. 8 ZDA--SiRF Timing Message Outputs the time associated with the current 1 PPS pulse. 12 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! will be output within a few hundred ms after the 1 PPS pulse is output and will tell the time of the pulse that just occurred. Table 4-12 contains the values for the following example: $GPZDA, 181813, 14, 10, 2003, 00, 00*4F Table 4-12 ZDA Data Format Name Message ID UTC Time Day Month Year Local zone hour Local zone hour Checksum <CR> <LF> Example Units Description ZDA protocol header Either using valid IONO/UTC or estimated from default leap seconds 01 TO 31 01 TO 12 1980 to 2079 $GPZDA 181813 14 10 2003 00 00 4F knots Offset from UTC (set to 00) Offset from UTC (set to 00) End of message termination 4. 2 RTCM Received Data The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no parity. Position accuracy of less than 5 meters can be achieved with GR-90 by using Differential GPS (DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 2, or 9. As using DGPS receiver with different communication parameters, GPS-82 may decode the data correctly to generate accurate messages and save them in battery-back SRAM for later computing. HOLUX Technology, Inc. 13 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! 4. 3 . [. . . ] 19 1F, No. 30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park) TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux. com. tw Website:www. holux. com. tw GPS Product series With HOLUX, You never lose the way! 4) Open "GPSViewer" on PC, as Fig. 6. 3) 5) The following window is show after executing 6) GPSViewer, as Fig. 6. 4) 7) Setup Baud rate: 4800, then push "Scan" bottom to scan your COM Port . Select your COM Port (COM1 ~ COM10), then push "Open GPN" bottom, as Fig. [. . . ]