diff options
| -rw-r--r-- | www/NMEA.txt | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/www/NMEA.txt b/www/NMEA.txt index a643206f..861b2270 100644 --- a/www/NMEA.txt +++ b/www/NMEA.txt @@ -1086,7 +1086,7 @@ Field Number: 3. N or S (North or South) 4. Longitude 5. E or W (East or West) -6. Mode indicator +6. Mode indicator (non-null) 7. Total number of satelites in use,00-99 8. HDROP 9. Antenna altitude, meters, re:mean-sea-level(geoid. @@ -1095,6 +1095,20 @@ Field Number: 12. Differential reference station ID 13. Checksum +The Mode indicator is two or more characters, with the first and second +defined for GPS and GLONASS. Further characters may be defined. For +each system, the character can have a value (table may be incomplete): + +* N = Constellation not in use, or no valid fix +* A = Autonomous (non-differential) +* D = Differential mode +* P = Precise (no degradation, like Selective Availability) +* R = Real Time Kinematic +* F = Float RTK +* E = Estimated (dead reckoning) Mode +* M = Manual Input Mode +* S = Simulator Mode + === GRS - GPS Range Residuals === ------------------------------------------------------------------------------ @@ -1121,10 +1135,12 @@ Field Number: 14. Satellite 12 residual in meters (blank if unused) 15. Checksum -The order of satellites the same as those in the last GSA. +The order of satellites MUST match those in the last GSA. Example: $GPGRS,024603.00,1,-1.8,-2.7,0.3,,,,,,,,,*6C +Note that the talker ID may be GP, GL, or GN, depending on if the residuals +are for GPS-only, GLONASS-only, or combined solution, respectively. === GST - GPS Pseudorange Noise Statistics === |