From 0bf91be250ab7e53c298b48f8593302d8c7778d5 Mon Sep 17 00:00:00 2001 From: "Gary E. Miller" Date: Tue, 21 Jun 2016 12:00:44 -0700 Subject: Add some commments on xxGSA. Not all doc specifies the number of PRNs in the sentence. The doc that does usually says 12. --- driver_nmea0183.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'driver_nmea0183.c') 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 * -- cgit v1.2.1