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FirstGPS Starter Kit User Guide
75
Using the FirstGPS API
A
1.7.15
navGetSvSelections
Get satellite selection.
Description
This function returns a list of satellites used for a position fix. The
structure, npFixSvSelType, has the current constellation of satellites
used in doing a position fix. It also contains modes of operation flags
and DOP values. Notice that a negative cSvUsed number indicates that
an SV was not included for the position fix calculation because of poor
integrity. For detailed descriptions, refer to npFixSvSelType, page 42.
Included Header File
#include “npStdIface.h”
Format
npRetCode navGetSvSelections (npFixSvSelType* ptFixSvSel);
Output Parameter
Return Values
Data Type Parameter Description
npFixSvSelType* ptFixSvSel A pointer to a data structure which
includes number of satellites, DOPs,
and modes of operation. Use the
ucStatus field of the structure to
determine the current status of the
navigation platform. For details, refer to
npFixSvSelType, page 42.
Value Description
NAV_OK The npFixSvSelType structure has
valid data.
NAV_ERROR The npFixSvSelType structure does
not have valid data.