Re: DGPS / SBAS

[Gary E. Miller]

Yo Greg!

On Thu, 30 Nov 2023 16:27:49 -0500
Greg Troxel <gdt@lexort.com> wrote:

> > Sadly no two firmware use the same definition for when to turn the
> > DGPS flag on.  
> 
> Agreed it's a mess but "DGPS" is obviously short for "Differential
> GPS" and a receiver should only say it has that fixtype if it is
> applying pseudorange corrections from either SBAS or some direct
> injection of RTCM2, such as would happen with the old USCG beacons.

Or RTCM3, or any of a number of prprietary protocols.

But nothing mentioned that the corrections are actually improving
the fix quality.

> It seems pretty clear that either  this particular receiver is buggy
> or that we're getting incorrect data about its behavior.

Yeah, some raw NMEA may be interestsing.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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