Ephemeris data

The Sirf ephemeris data is packed binary data with the following descritption:

Data consisting of 45 16-bit unsigned integers that make up 3 subframes of data with each consisting of 15 unsigned 16-bit integers. This data is the ephemeris subframe data collected from the 50bps data stream, and compressed by packing each subframe from 10 subframe words (32 bits/word) into 15 words (16 bits/word) with the tlm and parity words stripped off.

SirfGetEphemeris, GPSINITTIME

Types

typedef struct {
  unsigned short subframe[3][15];
  GPSINITTIME ephemerisTime;
} SIRF_PACKED_EPHEMERIS;

sirfapi.h

Types, See Also