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| author | Eric S. Raymond <esr@thyrsus.com> | 2015-02-15 05:31:09 -0500 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2015-02-15 05:31:09 -0500 |
| commit | 393a55b08021385177a2dd6b6707ff051a791936 (patch) | |
| tree | 2ea11caf5b1575f273cde44319d61cd6cb18f421 /www | |
| parent | ff34e962766238111488b84b0692b97e9acfecd6 (diff) | |
| download | gpsd-393a55b08021385177a2dd6b6707ff051a791936.tar.gz | |
Add more documentation on NMEA ID ranges to NMEA.txt.
No code changes.
Diffstat (limited to 'www')
| -rw-r--r-- | www/NMEA.txt | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/www/NMEA.txt b/www/NMEA.txt index deb46444..1fcdae1a 100644 --- a/www/NMEA.txt +++ b/www/NMEA.txt @@ -1,6 +1,6 @@ = NMEA Revealed = Eric S. Raymond <esr@thyrsus.com> -v2.14, May 2014 +v2.15, Feb 2015 NMEA 0183 is a proprietary protocol issued by the National Marine Electronics Association for use in boat navigation and control @@ -381,10 +381,8 @@ Here is a table of NMEA-ID allocations above 32 as of March 2010: In general, NMEA-ID = PRN - 87. Theoretically, all NMEA-emitting devices should emit NMEA-IDs. In practice, some pass through PRNs. -Documentation on IDs for GLONASS satellites is scanty and -contradictory. The manual for one GLONASS-capable receiver has this to -say (but it is not clear whether the "established convention" -is obeyed by other devices, which may use different GLONASS offsets): +Documentation on IDs for GLONASS satellites is scanty. +The manual for one GLONASS-capable receiver has this to say: To avoid possible confusion caused by repetition of satellite ID numbers when using multiple satellite systems, the following @@ -403,6 +401,26 @@ numbers are 1 through 24 for the full constellation of 24 satellites, this gives a range of 65 through 88. The numbers 89 through 96 are available if slot numbers above 24 are allocated to on-orbit spares. +Other sources such as <<SATSTAT>> confirm that the NMEA standard +assigns NMEA IDs 65-96 to GLONASS. It goes on with the following +table: + +[frame="topbot",options="header"] +|==================================================== +| 1 - 32 | GPS +| 33 - 54 | Various SBAS systems (EGNOS, WAAS, SDCM, GAGAN, MSAS) +| 55 - 64 | not used (might be assigned to further SBAS systems) +| 65 - 88 | GLONASS +| 89 - 96 | GLONASS (future extensions?) +| 97 - 192 | not used +| 193 - 195 | QZSS +| 196 - 200 | QZSS (future extensions?) +| 201 - 235 | Beidou +|==================================================== + +QZSS and Beidou are regional GPS augmentation systems using +geostationary satellites fielded by Japan and China respectively. + == Obsolete sentences == The following NMEA sentences have been designated "obsolete" in a @@ -2367,6 +2385,8 @@ Described in <<MALTESE>>, actually a Maltese government document. "SeaTalk Technical Reference" http://www.thomasknauf.de/seatalk.htm +- [[[SATSTAT]]] "NMEA IDs" https://github.com/mvglasow/satstat/wiki/NMEA-IDs + - [[[GLOBALSAT]]] "NMEA (National Marine Electronics Association) 0183 Protocol" http://www.usglobalsat.com/faq_details/NMEA.htm |