[FOSS-GPS] RTKLib fixed baseline length

Marco Mendonça mammendonca at gmail.com
Sun Apr 3 16:46:29 PDT 2016

In average, without the constraint, they agree at a 5mm level with a
standard deviation of 3 cm. It is a pretty reasonable solution given the
dynamics, but I'd like this noise to be propagated to the other parameters
being estimated, where they actually belong.

The antennas are experimental, so I don't have the antenna type or the
phase centers, but they are both exactly the same, with the same
orientation, so I think this effect is not the one to blame. And the
baseline measurement was made with a caliper, down to the millimeter
between the antenna mounts.

If I can't figure this out, I'll keep with the unconstrained solution. Not
a big deal, but also not the ideal solution.

Thank you very much for the help Mr. Kelley and Dr. Nievinski!

- Marco Mendonça

On Sun, Apr 3, 2016 at 7:39 PM, Felipe G. Nievinski <fgnievinski at gmail.com>

> How large is the difference between estimated baseline length and its
> assumed value?  I presumed it's been measured with a tape, between antennas
> reference points (not the antenna phase centers)?  Also, make sure you're
> configuring the antenna models correctly in RTKLIB settings.
> -FGN.
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