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Re: [gpsd-users] Galileo

From: Gary E. Miller
Subject: Re: [gpsd-users] Galileo
Date: Thu, 8 Mar 2018 11:25:49 -0800

Yo aimdev!

On Thu, 8 Mar 2018 19:10:19 +0000
aimdev <address@hidden> wrote:

> IMHO based on the technique used in my client, the prn/id/whatever
> was used to try to determine the constellation.

That only works if you know the exact vendor and version of your GPS.
Even the same GPS model number does it idfferently in different
firmware versions.

> With all the confusion regarding prn/is/whatever, using a gnssid
> approach is I fell the best, so you can have gps 1
> glonass 1
> etc

That is the data the GPS gives us, if we are lucky, so no other real

> BUT, this will only work if the gps device supports it, and this is
> the issue, do you make gpsd for all possible gps devices, or focus on
> the more popular?

gpsd tries to support all we can.  The only reason for lack of support is
when we have no device available to test or no one interested in
doing the work.

> NMEA appears to be an attempt to ’normalise’ devices, but is not
> achieving that goal anymore.

A moving standard that real people can't look at is not much of a

> The concept decided by the gpsd team way
> back appears to have been to use an object oriented approach of
> defined objects. 

I see NMEA also as object oriented.  GPGSV is an object, GPRMC is an
object.  gpsd just tries to handle all the different objects and
components in one big mess.

> Back then there was not so much choice in gps receivers, or
> constellations, my trusty BU-303 is really limited compared to the
> u-blox m8. 
> Just my 2 euro’s worth

The m8 series is pretty nice.  Then you get to the professional stuff
that does L2, L5, etc.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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