User manual HAICOM USB GPS RECEIVER

[. . . ] Check Enable COM Port Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remove GPS USB Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHANGE COM PORT NUMBER APPLICATION PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMPORTANT REMARK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The HI-204III-USB incorporates a proprietary algorithm to compensate the effect of satellite constellation change, and maintains an accurate smooth estimate of the receiver position, velocity, and heading. 9 2. Electrical Characteristics Items Chipset General GSP3F Frequency C/A code Channels Position Accuracy Velocity Datum Time Default Other Description SiRF StarIII technology L1, 1575. 42 MHz 1. 023 MHz chip rate 20 10 meters, 2D RMS 5 meters 2D RMS, WAAS corrected <5meters(50%), DGPS corrected 0. 1 meters/second 1 microsecond synchronized to GPS time WGS-84 selectable for other Datum 0. 1 sec. , average 1 sec. , average 8 sec. , average 38 sec. , average 42 sec. , average 18, 000 meters (60, 000 feet) max. 20 meters/second3, max. Acquisition Reacquisition Rate (Open Sky Snap start & Stationary Requirements) Hot start Warm start Cold start Altitude Dynamic Conditions Velocity Acceleration Jerk Power Dimension Weight Main power input 5V DC input. Power consumption 0. 38 W (continuous mode) Supply Current 75mA Backup power 3 V Lithium-Ion rechargeable battery 43mm L x 42mm W x 13mm H 23g 10 2. 2 LED INDICATOR LED flashing 0. 25Hz LED flashing 1Hz Signal Searching Position Fixed 11 SECTION 3 HARDWARE INTERFACE 3. 1 MECHANICAL DIMENSIONS Unit:mm Top View 69±0. 2 I/O Cable Build-in patch antenna Lateral View 20±0. 2 I/O Cable Bottom View LED indicator 69±0. 2 I/O Cable CPU Magnetic 73±0. 2 12 3. 2 ONE-PULSE-PER-SECOND (1PPS) OUTPUT The one-pulse-per-second output is provided for applications requiring precise timing measurements. Rising edge of the output pulse is accurate to +/-1usec with respect to the start of each GPS second. Accuracy of the one-pulse-per-second output is maintained only when the GPS receiver has valid position fix. The 1PPS output is always generated when the GPS receiver is powered-on. Proper adjustment of the 1PPS output to align with the GPS second requires calculation of the receiver clock offset and clock drift-rate as part of the position-velocity-time (PVT) solution. When enough satellite signals are received to generate valid position fixes, the 1PPS output is adjusted to align with the GPS second in several seconds. When the 1PPS output is brought in sync with the GPS second, the 1PPS Valid Signal on the I/O pin becomes active (HIGH); when the 1PPS output is not yet in sync with the GPS second, the 1PPS Valid Signal remains inactive (LOW). 13 As long as enough satellite signals are received to generate valid position fixes, the 1PPS output remains synchronized to the GPS second, and the 1PPS Valid Signal remains active. If signal blockage prevents the receiver from generating valid position fix, the 1PPS output will drift away from the GPS second and the 1PPS Valid Signal will become inactive. Upon re-acquiring enough satellites to generate consecutive valid position fixes, the 1PPS Valid Signal will become active again, signaling that the 1PPS output is again synchronized with the GPS second. For best stable operation of the 1PPS signal, it is to be operated in static environment having clear view of the sky. 14 SECTION 4 SOFTWARE INTERFACE This section describes the details of the serial port commands through which the HI-204III-USB is controlled and monitored. The serial port commands allow users to set the receiver parameters, configure output message type, and retrieve status information. The baud rate and protocol of the host COM port must match the baud rate and protocol of the GPS receiver serial port for commands and data to be successfully transmitted and received. The default receiver protocol is 4800 bps, 8 data bits, 1 stop bit, and none parity. 4. 1 NMEA OUTPUT MESSAGE SPECIFICATION The HI-204III-USB supports NMEA-0183 output format as defined by the National Marine Electronics Association (http://www. nmea. org). The currently supported NMEA messages for GPS applications are: GGA Global Positioning System Fix Data GLL Geographic Position Latitude / Longitude GSA GNSS DOP and Active Satellites GSV GNSS Satellites in View RMC Recommended Minimum Specific GNSS Data VTG Course Over Ground and Ground Speed 15 4. 1. 1 NMEA Messages The serial interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASCII interface specification. This standard is fully define in "NMEA 0183, Version 3. 01" The standard may be obtained from NMEA, www. nmea. org 4. 1. 2 GGA - GPS FIX DATA Time, position and position-fix related data (number of satellites in use, HDOP, etc. ). Format: $GPGGA, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, M, <10>, M, <11>, <12>, *<13><CR><LF> Example: $GPGGA, 104549. 04, 2447. 2038, N, 12100. 4990, E, 1, 06, 01. 7, 00078. 8, M, 0016. 3, M, , *5C<CR><LF> 16 Field Example Description 1 104549. 04 UTC time in hhmmss. ss format, 000000. 00 ~ 235959. 99 2 2447. 2038 Latitude in ddmm. mmmm format Leading zeros transmitted 3 N Latitude hemisphere indicator, 'N' = North, 'S' = South 4 12100. 4990 Longitude in dddmm. mmmm format Leading zeros transmitted 5 E Longitude hemisphere indicator, 'E' = East, 'W' = West 6 1 Position fix quality indicator 0: position fix unavailable 1: valid position fix, SPS mode 2: valid position fix, differential GPS mode 7 06 Number of satellites in use, 00 ~ 12 8 01. 7 Horizontal dilution of precision, 00. 0 ~ 99. 9 9 00078. 8 Antenna height above/below mean sea level, -9999. 9 ~ 17999. 9 10 0016. 3 Geoidal height, -999. 9 ~ 9999. 9 11 Age of DGPS data since last valid RTCM transmission in xxx format (seconds) NULL when DGPS not used 12 Differential reference station ID, 0000 ~ 1023 NULL when DGPS not used 13 5C Checksum Note: The checksum field starts with a '*' and consists of 2 characters representing a hex number. The checksum is the exclusive OR of all characters between '$' and '*'. 17 4. 1. 3 GLL - LATITUDE AND LONGITUDE, WITH TIME OF POSITION FIX AND STATUS Latitude and longitude of current position, time, and status. Format: $GPRMC, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, <10>, <11>, <12>*<13><CR><LF> Example: $GPRMC, 104549. 04, A, 2447. 2038, N, 12100. 4990, E, 016. 0, 221. 0, 250304, 003. 3, W, A*22<CR><LF> 23 Field Example Description 1 104549. 04 UTC time in hhmmss. ss format, 000000. 00 ~ 235959. 99 2 A Status, 'V' = navigation receiver warning, 'A' = valid position 3 2447. 2038 Latitude in dddmm. mmmm format Leading zeros transmitted 4 N Latitude hemisphere indicator, 'N' = North, 'S' = South 5 12100. 4990 Longitude in dddmm. mmmm format Leading zeros transmitted 6 E Longitude hemisphere indicator, 'E' = East, 'W' = West 7 016. 0 Speed over ground, 000. 0 ~ 999. 9 knots 8 221. 0 Course over ground, 000. 0 ~ 359. 9 degrees 9 250304 UTC date of position fix, ddmmyy format 10 003. 3 Magnetic variation, 000. 0 ~ 180. 0 degrees 11 W Magnetic variation direction, 'E' = East, 'W' = West 12 A Mode indicator 'N' = Data invalid 'D' = Differential 'A' = Autonomous 'E' = Estimated 13 22 Checksum 24 4. 1. 7 VTG - COURSE OVER GROUND AND GROUND SPEED Velocity is given as course over ground (COG) and speed over ground (SOG). Format: GPVTG, <1>, T, <2>, M, <3>, N, <4>, K, <5>*<6><CR><LF> Example: $GPVTG, 221. 0, T, 224. 3, M, 016. 0, N, 0029. 6, K, A*1F<CR><LF> Field 1 2 3 4 5 Example 221. 0 224. 3 016. 0 0029. 6 A Description True course over ground, 000. 0 ~ 359. 9 degrees Magnetic course over ground, 000. 0 ~ 359. 9 degrees Speed over ground, 000. 0 ~ 999. 9 knots Speed over ground, 0000. 0 ~ 1800. 0 kilometers per hour Mode indicator 'N' = Data invalid 'A' = Autonomous 6 1F Checksum 'D' = Differential 'E' = Estimated 25 APPENDIX B DEFAULT VALUES The product has the following factory preset default values: Datum: NMEA Enable Switch: 000 (WGS-84) GGA ON ( 1 sec. [. . . ] If your system is Windows 2000, please refer to Windows XP installation guide. 2. If you follow the steps but the GPS receiver doesn't work, please try to unplug the GPS receiver from the USB port, wait for 5~8 seconds, and re-plug the GPS receiver into your PC. 3. Occasionally the mouse cursor does not work properly when you run the Win2000 and Win XP, and this situation is owing to Win2000 and Win XP operating system instead of the GPS receiver. Microsoft announces that this situation is "the serial device may be detected as a serial mouse in Win2000 and Win XP". 60 4. [. . . ]