Lantronix PNT Series PNT-SG3FS GNSS Module Software User Guide - Page 73

11. Commands $PSTMALMANAC Load Almanacs data. This command allows the user to load the almanacs data into backup memory. If more than one $PSTMALMANAC command needs to be issued, between two consecutive commands theremust be at least a 20 ms delay. Synopsis: $PSTMALMANAC,,,,...,* Arguments: Table 28. $PSTMALMANAC Field Description Parameter Format Description sat_id Decimal, 2 digits Satellite number N Decimal, 1 digit Number of the almanac data bytes byte1 Hexadecimal, 2 digits First byte of the almanac data byteN Hexadecimal, 2 digits Last byte of the almanac data checksum Hexadecimal, 2 digits Checksum of the message bytes without * characters. The N Bytes that are in the parameters are the dump of a structure that contains all the information of thealmanac. Data format is constellation dependent. Table 29. $PSTMALMANAC Field Description for GPS Constellation Bits 8 16 8 16 16 16 24 24 24 24 11 11 1 1 Structure Member satid week toa e delta_i omega_dot root_A omega_zero perigee mean_anomaly af0 af1 health available Description The satellite number The week number for the epoch Reference time almanac. Eccentricity. Rate of inclination angle. Rate of right ascension. Square root of semi-major axis. Longitude of ascending node of orbit plane at weekly epoch. Argument of perigee. Mean anomaly at reference time. Constant clock correction. First order clock correction. Contains 1 if the satellite is unhealthy 0 if healthy. Contains 1 if almanac is available 0 if not. PNT-SG3FS GNSS Module Software User Guide 73