SirfGetEphemeris

Gets ephemeris data from a SiRF receiver

Examples

    SIRF_GPSSATELLITES_EX GpsSatellitesEx;      // SiRF extended satellite structure
    SIRF_PACKED_EPHEMERIS Frame;            // Subframe data
    SIRF_EPHEMERIS_DATA Ephdata[MAX_SVID_CNT];  // Engineering parameters
    unsigned short usSvid = 0;

        //Get Satellite info
        SirfGetSatellitesEx(&GpsSatellitesEx);
        // Satellite Struct is channel based, obtain SVID
    for ( int i = 0; i < GPS_NUMBER_OF_CHANNELS; i++ )
    {
        if (GpsSatellitesEx.gsSatelliteEx[i].fEphemerisAvailable )
        {
            usSvid = GpsSatellitesEx.gsSatelliteEx[i].usID;
            SirfPollEphemeris(usSvid);
            Sleep(3000);
            SirfGetEphemeris(usSvid,&Frame);
            // Decode obtains engineering parameters
            SirfDecodeEphemeris(&Frame,&Ephdata[usSvid -1]);
        }
    }

Parameters

Parameters	Description
SIRF_PACKED_EPHEMERIS * pFrame	Pointer to SIRF_PACKED_EPHEMERIS.
ulSvid	Range 0 to 32.

Return Value

Returns GPSERROR_NONE on success or GPSERROR_CONFIG on failure.

Remarks

Call SiRFPollEphemeris before this function to cause the receiver to output the data
The user is responsible for allocating and freeing the memory for the parameter(s).