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FirstGPS Starter Kit User Guide
41
Using the FirstGPS API
A
1.4.5
npDopType
npDopType contains a set of DOP (dilution of precision) parameters.
1.4.6
npErrorEstType
npErrorEstType stores the system estimate of error of the produced
fix. These are 1-sigma values and are computed based on the expected
error from each satellite and the geometry of the constellation in use.
1.4.7
npFixChType
npFixChType stores channel-dependent fix data.
Data Type Variable Description
FLT fltPDOP Position DOP.
FLT fltHDOP Horizontal DOP.
FLT fltVDOP Vertical DOP.
FLT fltTDOP Time DOP.
Data Type Variable Description
FLT flt3D Total position error in meters.
FLT fltHoriz Horizontal position error in meters.
FLT fltVert Vertical position error in meters.
FLT fltTime Time bias error in meters.
Data Type Variable Description
FLT fltReserved[N_CHANNELS+1] Reserved for future use.
S16 sCno[N_CHANNELS] CNO of SVs used in fix. The range is
0to47.
U8 ucSvUsed[N_CHANNELS] ID of satellites used.
U8 ucIode[N_CHANNELS] IODE of satellites used.
U8 ucAmu5[N_CHANNELS] AMU*5 of SVs used in fix. The range is
0-16*5=80.