OPUS antenna Height Triumph LS

[James Suttles]

This may have been covered before. I tried to search to see if I missed something. I recently obtained a static session. Submitted to DPOS, got a solution. Thought I would send to OPUS-RS to double check the solution. Converted the JPS to rinex. Submitted to OPUS, used the HI that was in the DPOS submitted session, and BAM, it comes back 0.375' too High. So my question is when submitting a file to OPUS, do I need to add 0.375' to the HI that OPUS will use to compute the vertical.

Note: I did select JAVTRIUMPH_LSA NONE as the Antenna.

If this is the workflow, no problem, if not, then I am confused why the HI would be correct in DPOS, and matche the point collected with the RTN, but not correct in OPUS.

Thx

 

[Duane Frymire]

Been awhile since I did an OPUS. But I recall maybe an extra step I had to watch out for. Make sure you enter correct HI (in correct units) both in conversion to rinex and in OPUS submission.

 

[Matt Johnson]

Can you attach your reports from OPUS and DPOS?

 

[James Suttles]

They are attached. If I use the same Antenna Height in the OPUS, it busts out 0.37'. I added the 0.375' as that should be the APC, Correct?

 

[Adam]

That OPUS solution has a very high residual in the up 0.078 m. I don't know that comparing the rapid static with the dpos is going to tell us much when the opus residual is that high. The DPOS residual was 0.006 m.

 

[StLSurveyor]

OPUS only uses GPS, remember that...79% is not the best I've every seen.

 

[Duane Frymire]

Yeah, not an antenna height problem. The 79% doesn't bother me, but the 3.35 is borderline and the 0.078m are indicators you may not have a reliable solution. Oops, misread distance to cors. If better elevation is important for the project I would set another point, process with both, check elevation difference with total station to see if agreement can be had.

What, did I misread? It looks like using all different stations and OPUS using stations more than 30 miles away. I'll rewrite what I erased. If using OPUS with nearest CORS more than 30 miles away, you will usually not get much better elevation, but can get a better one with DPOS.