Garmin HVS 16X Technical Specifications - Page 27
Satellite Data Record
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UPC - 753759077808
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alt epe eph epv fix gps_tow lat lon lon_vel lat_vel alt_vel msl_hght leap_sec grmn_days Ellipsoid altitude (meters) Estimated position error (meters) Position error, horizontal (meters) Position error, vertical (meters) 0 = no fix; 1 = no fix; 2 = 2D; 3 = 3D; 4 = 2D differential; 5 = 3D differential; 6 and greater = not defined GPS time of week (sec) Latitude (radians) Longitude (radians) Longitude velocity (meters/second) Latitude velocity (meters/second) Altitude velocity (meters/ second) height (mean sea level) (meters) UTC leap seconds Garmin days (days since December 31, 1989) Satellite Data Record The satellite data has a record ID of 0x72 with 84 (0x54) data bytes. The data bytes contain data for 12 satellites as described below. typedef struct { uint8 svid; //space vehicle identification (1-32 and 33-64 for WAAS) uint16 snr; //signal-to-noise ratio uint8 elev; //satellite elevation in degrees uint16 azmth; //satellite azimuth in degrees uint8 status; //status bit-field } cpo_sat_data; The status bit field represents a set of booleans described below: Bit Meaning when bit is one (1) 0 The unit has ephemeris data for the specified satellite. 1 The unit has a differential correction for the specified satellite. 2 The unit is using this satellite in the solution. This pattern is repeated for 12 satellites for a total of 12 X 7 bytes = 84 (0x54) bytes. The RS-232 Packet for the Satellite Record looks like: - 0x10 (DLE is first byte) - 0x72 (Record ID - single byte) - 0x54 (Number of data bytes - single byte) - 12 cpo_sat_data records - 0x## (2's complement of the arithmetic sum of the bytes between the delimiters) - 0x10 (DLE) - 0x03 (ETX is last byte) The USB Packet for the Satellite Record looks like: - 0x72 (Record ID - single byte) - 0x54 (Number of data bytes - single byte) - 12 cpo_sat_data records 190-00228-08 GPS 16x Technical Specifications Page 23 Rev. B
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