DPOS Triumph 2 files failure

jcorax

Member
I have 3x Triumph 2 files that were processed with DPOS. They are in the range of 100+ meters off location when I verify the coordinates (GIS & other software). I am postprocessing with RTKPost against a 2nd Triumph 2. I am unable to get a solution with RTKPost for these. However DPOS does give a solution (with a low RMSE) however it is apparently not a good solution and there is no warning on the file that it is.

Many other points collected on the same day generate good solutions through both DPOS and RTKPost.

Can anyone tell me what is going on with these files:
1) Why does DPOS give me a solution that appears to be good (but is not)?
2) Can these files be salvaged?
3) All appears to be normal with these files (file size, occupation time, number of observations used is lower than expected but not extreme?) how can I tell from the DPOS report that this result is not good?

Please see attached.
 

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Alexey Razumovsky

Well-Known Member
JAVAD GNSS
5PLS
I have 3x Triumph 2 files that were processed with DPOS. They are in the range of 100+ meters off location when I verify the coordinates (GIS & other software). I am postprocessing with RTKPost against a 2nd Triumph 2. I am unable to get a solution with RTKPost for these. However DPOS does give a solution (with a low RMSE) however it is apparently not a good solution and there is no warning on the file that it is.

Many other points collected on the same day generate good solutions through both DPOS and RTKPost.

Can anyone tell me what is going on with these files:
1) Why does DPOS give me a solution that appears to be good (but is not)?
2) Can these files be salvaged?
3) All appears to be normal with these files (file size, occupation time, number of observations used is lower than expected but not extreme?) how can I tell from the DPOS report that this result is not good?

Please see attached.
I will look into and answer
 

Alexey Razumovsky

Well-Known Member
JAVAD GNSS
5PLS
1) DPOS process files correctly. DPOS solutions are in 1 meter away from naviganational/standalone.
solutions. So GIS sw or you yourself were misled.
2) Files are good.
3) 10-20 minutes obsevation sessions for baselines more than 150 km realy isn't good idea. I recommend 1 hour for baseline exceeded 100 km.
 
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