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| author | Gary E. Miller <gem@rellim.com> | 2016-06-21 12:00:44 -0700 |
|---|---|---|
| committer | Gary E. Miller <gem@rellim.com> | 2016-06-21 12:00:44 -0700 |
| commit | 0bf91be250ab7e53c298b48f8593302d8c7778d5 (patch) | |
| tree | f529d84aca1015c6a362ccdb167d43720a8e209b /driver_nmea0183.c | |
| parent | 88190a196420c5fe144f5e962767a83a90ce9f8d (diff) | |
| download | gpsd-0bf91be250ab7e53c298b48f8593302d8c7778d5.tar.gz | |
Add some commments on xxGSA.
Not all doc specifies the number of PRNs in the sentence. The
doc that does usually says 12.
Diffstat (limited to 'driver_nmea0183.c')
| -rw-r--r-- | driver_nmea0183.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/driver_nmea0183.c b/driver_nmea0183.c index eff633a0..6776efb8 100644 --- a/driver_nmea0183.c +++ b/driver_nmea0183.c @@ -554,12 +554,18 @@ static gps_mask_t processGSA(int count, char *field[], * 16 = HDOP * 17 = VDOP * + * Not all documentation specifies the number of PRN fields, it + * may be variable. Most doc that specifies says 12 PRNs. + * * The Skytraq S2525F8-BD-RTK output both GPGSA and BDGSA in the * same cycle: * $GPGSA,A,3,23,31,22,16,03,07,,,,,,,1.8,1.1,1.4*3E * $BDGSA,A,3,214,,,,,,,,,,,,1.8,1.1,1.4*18 * These need to be combined like GPGSV and BDGSV * + * Some Skytraq will emit all GPS in one GNGSA, Then follow with + * another GNGSA with the BeiDou birds. + * * Some GPS emit GNGSA. So far we have not seen a GPS emit GNGSA * and then another flavor of xxGSA * |