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claudegps8
41 Posts |
 Posted - 05 janv. 2012 : 16:32:09
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NMEA output is very common for applications related to GPS receivers.
We are all familiar with GPGGA, GPRMC etc...
New receiver that are coming to the market, may extend the NMEA output including Glonass/GNSS sentences.
The main difference is related to the sentence talker ID (the first two letters after $). For Glonass it's GL, while GN is for GNSS.
Developing applications for future receivers, this should be take into account.
More details, sample files and other differences with GPS only output here:
http://gnss-info.blogspot.com/p/nmea-con-glonass.html |
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Archie2008
12 Posts |
Posted - 09 janv. 2012 : 19:15:39
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claudegps8
Proper navigation software shall skip talker ID or use it for information only. This is commion practice in marine software for tens of years, especially for compasses with NMEA-data.
NMEA-parser looks for '$' prefix then skip 2xASCII-characters then checks format of message (GGA, RMC etc.) |
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claudegps8
41 Posts |
Posted - 09 janv. 2012 : 20:16:30
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quote:
Originally posted by Archie2008
claudegps8
Proper navigation software shall skip talker ID or use it for information only. This is commion practice in marine software for tens of years, especially for compasses with NMEA-data.
NMEA-parser looks for '$' prefix then skip 2xASCII-characters then checks format of message (GGA, RMC etc.)
Archie2008, I agree. Proper navigation software does rigth.
But not every software is doing it! There are a lot softwares out there looking for the string with talker ID.
Anyway, it's not only a matter of supporting the talker ID (or at least ignore it), but also support the decoding of satellite IDs greater than 32.
Simply ignoring the talker ID, may lead to misinterpretation of sentences like some new implementations of GSA that now may come in more than one sentence each block of info - if you simply ignore the talker, you will loose information about the list of used satellites.
Regards
http://gnss-info.blogspot.com |
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Glonass and GNSS compatibility
