[FOSS-GPS] [RTKLib - RTKPOST] Problems with base station coordinates
Felipe G. Nievinski
fgnievinski at gmail.com
Tue Dec 1 13:29:17 PST 2015
This is a feature. ANTENNA DELTA eccentricities are from the survey marker
to the antenna reference point (ARP, normally the bottom of the antenna) --
that's because of the antenna mount in your case. PCV ANTEX offsets are
from the ARP to the antenna phase center (APC, normally inside the body of
the antenna) -- it varies with the antenna model. The intended usage is so
that the marker coordinates won't change if you mix and match different
antenna mounts and antenna models.
> I'm using the post-processing module RTKPOST of RTKLib software (ver.
> 2.4.2, patch 11) with dual frequency GNSS RINEX files, and I noticed a
> small problem regarding the settings of the base station coordinates in
> In the "Positions" > "Base Station" window, when I select the "RINEX
> Header Position" coordinates (that in my files are the precise coordinates
> of the base station in ETRS89 reference system), the software sums these
> two RINEX fields: "APPROX POSITION XYZ" + "ANTENNA: DELTA H/E/N"
> Unfortunately, if I also use antenna PCV ANTEX files, the "ANTENNA:
> DELTA H/E/N" values are added again during the processing, so my final
> rover position has an offset equal to the "ANTENNA: DELTA H/E/N" values.
> Since usually the "ANTENNA: DELTA H/E/N" values are equal to zero,
> this problem is difficult to be found. But our antennas have a small offset
> (few cms) due to a SCIGN leveling mount like this one:
> The solution of my problem is to manually insert the XYZ coordinates of
> the base station. But I find very useful the "RINEX Header position"
> Did I do something wrong?
> Do you have the same problem?
> If you confirm my problem, I will wrote to the software developer to
> report the bug.
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