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Re: gpsprof: higher resolution

From: Gary E. Miller
Subject: Re: gpsprof: higher resolution
Date: Sun, 16 Aug 2020 16:19:11 -0700

Yo John!

On Sun, 16 Aug 2020 19:10:15 -0400
John Ackermann N8UR <> wrote:

> BTW, it's possible that the reason I'm not able to get a FIX solution
> is that the reference station I'm using (an old Trimble NetRS) is
> GPS-only so the number of SVs being corrected is limited and the
> geometry might not support the ambiguity resolution required.  (I've
> tried limiting the F9P constellations to GPS only vs. all four, but
> that didn't make any difference.)

I'm surprised you get anything at all.  The u-blox doc specifies
proprietary RTCM3 messages to do RTK.

Look for 4072 subtype 0 and subtype 1.

> That's one reason why I'm interested in trying the ODOT reference 
> network in the hope that they will provide correctsions for GLONASS
> as well as GPS.

ODOT does GLONASS, but only in a "virtual" ntrip that gpsd does not
understand and no one can show me what messages are required.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  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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