User manual HAICOM HI-204III

[. . . ] The satellites actually broadcast two signals, one is only for military use, and the other can be used by both military and civilians. Since GPS is passive (you only need to receive the signal), there are no restrictions on who can use the signal available to civilians. GPS technology can be used in a variety of fields besides providing navigation for vehicles on the sea, in the air and on the ground. GPS applications also include keeping track of where a fleet of trucks, trains, ships or planes are and how fast they are moving; directin gemergency vehicles to the scene of an accident; mapping where a city's assets are located ; and providing precise timing for endeavors that require large-scale coordination. 3 GLOBAL POSITIONING SYSTEM HI-204III GPS RECEIVER Pin Assignment Connectors 1 3 5 1800±30mm 1 2 2 4 6 PS/2 Connector Color Green White Red Black Function TX RX VCC GND CN1 5 4 2 1 2 1 Mini Din: 6 pin male connector Wire: 3. 6 ± 0. 1mm 4 Pocket PC HI-204III PS/II GPS receiver Can Connecting to a female PS/II Connector. [. . . ] Supply voltage of 3. 3V, or 3. 8V~12V are supported. 1. 2 Features · 20 parallel channel GPS receiver · 4000 simultaneous time-frequency search bins · SBAS (WAAS, EGNOS) support · -159dBm tracking sensitivity · < 8 second hot start · < 40 second cold start 9 SECTION 2 RECEIVER OPERATION Upon power up, after initial self-test has completed, the HI-204III will begin satellite acquisition and tracking process. Under normal open-sky condition, position-fix can be achieved within approximately 35 seconds (within 10 seconds if valid ephemeris data is already collected from recent use). After receiver position has been calculated, valid position, velocity and time information are transmitted through the on board serial interface. The receiver uses the latest stored position, satellite data, and current RTC time to achieve rapid GPS signal acquisition and fast TTFF. If the receiver is transported over a large distance across the globe, cold-start automaticlocate sequence is invoked. The first position fix may take up to 50 sec searching the sky for the GPS signal. The acquisition performance can be improved significantly if the host initializes the receiver with a rough estimate of time and user position. 10 As soon as GPS signal is acquired and tracked, the HI-204III will transmit valid navigation information through its serial interface. The navigation data contains following information: · Receiver position in latitude, longitude, and altitude · Receiver velocity · Time · DOP error-magnification factor · GPS signal tracking status The HI-204III will perform 3D navigation when four or more satellites are tracked. When three or fewer satellites are tracked, altitude-hold is enabled using the last computed altitude and 2D navigation mode is entered. With signal blockage or rising and setting of the satellites, where a change in satellite constellation used for position fix occurred, large position error may result. The HI-204III 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. 11 2. Electrical Characteristics Chipset General Items GSP3F Frequency C/A code Channels Position Accuracy Velocity Time Default Other Reacquisition Snap start Hot start Warm start Cold start Altitude Velocity Acceleration Jerk Main power input 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. 5V DC input. Datum Acquisition Rate (Open Sky & Stationary Requirements) Dynamic Conditions Power Dimension Weight 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 2. 2 LED INDICATOR LED flashing 0. 25Hz LED flashing 1Hz Signal Searching Position Fixed 12 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 13 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). 14 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. [. . . ] 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 'D' = Differential 'E' = Estimated 6 1F Checksum 23 APPENDIX B DEFAULT VALUES The product has the following factory preset default values: Datum: NMEA Enable Switch: 000 (WGS-84) GGA ON ( 1 sec. Checksum ON Baud Rate: Elevation Mask: DOP Mask: 4800 Baud 5 degrees DOP Select: Auto GDOP: 10 PDOP: 10 HDOP: 10 Normal Mode (without 1PPS) output) output) output) output) Receiver Operating Mode: Commands can be issued to the HI-204III to change the settings of the receiver. The new settings will remain effective on next power-on as long as the on-board rechargeable backup battery is not discharged. After the backup battery is discharged, factory preset default settings will be used. 24 TROUBLESHOOTING Problem No Position output but timer is counting Reasons Weak or no GPS signal can be received at the place of HI-204III unit At outdoor space but GPS signal is blocked by building or car roof Solutions Place the HI-204III under an open space, then, press 'Reset' To try again, go to outdoor and press 'Reset' or connect external antenna on the side of HI-204III to improve the poor GPS signal PocketPC support multiple typs of CPU. [. . . ]