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FirstGPS Starter Kit User Guide
39
Using the FirstGPS API
A
1.4
FirstGPS API - Navigation Data Types
The following subsections list all the data structures used for the
Navigation platform. All bit field descriptions assume the convention
that the least significant bit (LSB), the first bit, is bit 0.
1.4.1
npAllChStatusType
npAllChStatusType is used to report the tracking status of all
channels.
1.4.2
npChStatusType
npChStatusType describes the tracking status for a channel.
Data Type Variable Description
U32 ulGpsTowMsec GPS time of week in milliseconds.
npChStatusType tChStatus[N_CHANNELS] Individual satellite tracking status. For
details, refer to npChStatusType in the
table below.
Data Type Variable Description
U8 ucSvId SV prn number.
U8 ucNavStatus Describes navigation status. For the
possible values and description, see
Navigation Status Code, page 52.
U8 ucAmu5 SNR in units of 0.2 AMU per bit.
S16 sCno SNR in units of CNO. The range is
0to47.
U16 usReserved Reserved for future use.
U16 usMeasStatus Describes measurement status. For all
the possible values and descriptions,
see Channel Status Code, page 52.
FLT fltAzimuth Azimuth in radians.
FLT fltElev Elevation in radians.