[FOSS-GPS] RTKLib fixed baseline length

Marco Mendonça mammendonca at gmail.com
Sat Apr 2 17:02:52 PDT 2016

Thanks, David!

I'm actually trying to post process two RINEX files on rtkpost from
antennas on a car. I chose the moving baseline option, set the baseline
length, but still, no solution.

When not setting the baseline length as fixed, it works fine. Although the
estimated baseline is close to the real value, I'd like it to be fixed.

I'm also using moving baseline. With the length constraint, the results are
noisy and only with 1.07% fixed epochs. Without the constraint, the fixed
epochs are around 90% and much smoother and coherent. And I'm absolutely
sure about the distance from antenna to antenna.

Also, thanks for the example provided! I'll connect there and try to debug
my option choices. Any other guesses of what might be happening are greatly



Date: Sat, 2 Apr 2016 15:09:23 -0700
> From: David Kelley <DavidKelley at iTSware.net>
> To: Open Source GPS-related discussion and support
>         <foss-gps at lists.osgeo.org>, mammendonca at gmail.com
> Subject: Re: [FOSS-GPS] RTKLib fixed baseline length
> Message-ID: <57004313.4050509 at iTSware.net>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> Marco :
> Works fine for me as well.
> There are no "special" switches, does it first work for you when
> stationary? Start with getting that to work as a first step.
> If you have it working in the mode "Kinematic" (ie normal moving rover
> RTK) or "Static" (ie stationary RTK where measurement noise is taken out
> in dithering the clock estimate more than the position), then
> "Moving-Base" should work as well.   I presume you know the reason for
> using this mode is often to get a precise estimate of the rovers heading.
> Here is an image of it working in that mode on short 130cm baseline.
> You can see that the two antenna are nearly, not not 100% located N-S
> with respect to each other.  The ~0.1 degree shift is because the West
> side of office building does not run a true north-south!   Feel free to
> connect to the SNIP NTRIP casters that are listed on the image below to
> confirm everything else is working.  [No user id is needed, and
> Serv2.itsware.net:2101 <http://serv2.itsware.net:2101/> is left up during
> the weekend. Not guarantees
> during the US work week as that is used a testing machine.]
> Good luck!
> Regards,  DC Kelley

- Marco Mendonça
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