I have some GNSS L1 L2 data collected from a Trimble receiver of a single station. I would like to obtain the NEU errors over time. So for a single station, PPP may be the only option.
I analyzed the GNSS position data using CSRS , RTKPOST, gLAB. From the results, I noticed that the CSRS results for NEU errors is the least, while RTKPOST and gLAB were comparatively larger. Anyone knows what is the factors in affecting their accuracies?
I tried to replicate the results in RTKPOST and gLAB with no avail. Anyone has any suggestions?
Thanks
Corse
FWIW,
Are you trying to compare within session NEU differences per epoch or between sessions?
As for PPP tools, have you tried this one from NASA?
http://apps.gdgps.net/apps_underhood.php
The page linked above describes the tool and the modeling performed. I believe the answer to your query is to be found in the differences in how each tool works. The choice of ephemeris used could also play a role.
I posted a solution file from the tool here:
http://geodesyattamucc.pbworks.com/w/file/64269766/APPS_solution.txt
HTH,
DMM