|
From: | Gerry Creager - NOAA Affiliate |
Subject: | Re: [gpsd-dev] Another query on terminology |
Date: | Tue, 7 Apr 2015 13:26:13 -0500 |
Sanjeev Gupta <address@hidden>:
> Eric,
>
> In some document (eg www/NMEA.txt) we say:
>
> "
> a. GPS satellites are identified by their PRN numbers, which range from 1
> to 32.
> "
> which implies that "GPS" is the US-specific constellation. The other
> constellations are referred to by name (GLONASS, BeiDou, etc). The term
> "GNSS" does not appear.
>
> In other documents (www/hacking.html.in) we seem to use the term GNSS as
> complementary: "The GPS/GNSS monitoring tools"
>
>
> In drivers.c , I see:
> :
> 3 NMEA_SEN_GGA, GPGGA interval - GPS Fix Data
> 4 NMEA_SEN_GSA, GPGSA interval - GNSS DOPS and Active Satellites
> 5 NMEA_SEN_GSV, GPGSV interval - GNSS Satellites in View
> 6 NMEA_SEN_GRS, GPGRS interval - GNSS Range Residuals
> 7 NMEA_SEN_GST, GPGST interval - GNSS Pseudorange Errors Statistics
> 13 NMEA_SEN_MALM, PMTKALM interval - GPS almanac information
> "
> which seems to be mixing up stuff.
>
> Suggestion: we use either one of:
>
> 1. GNSS as a generic, and GPS, GLONASS, BeiDou as systems
> 2. GPS as generic, and Navstar, GLONASS, BeiDou as systems
>
> Once you take this decision, I believe it will hep clarify the PRN issue a
> little as well. This will not impact code, just the documentation.
> --
> Sanjeev Gupta
> +65 98551208 http://www.linkedin.com/in/ghane
I've been thinking about this as well. Let's go with 2, it will confuse
most people less I think. Go ahead and patch this. Include definition
of "Navstar" where appropriate, and mention the ambiguity of "GPS".
--
<a href="" href="http://www.catb.org/~esr/" target="_blank">http://www.catb.org/~esr/">Eric S. Raymond</a>
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