"not solvable" Error in Helmert Transformation #227
Replies: 2 comments
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HI Parisa, My advice is more in regards to global GNSS network estimation since everyday solution is basically its own GNSS reference frame solution that are aligned but not the same basically. Otherwise in the daily solutions you will have global variations in orbits and stations which you remove by helmert transformation. So the helmert transformation just makes sure that your solutions are in the same frame as the other solution. But in this case I presume the same stations/satellites/models were used so I would just straight up compare them with the attitudes in my oppinion. Best regards, Patrick |
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Dear developers,
I have a question about the Helmert transformation. I remember that in discussion 128, @zhedumi explained the importance of estimating the Helmert transformation parameters in orbits comparison and I applied that for my network processing in comparing the GNSS satellite orbits.
Now, I have two orbits that I'd like to compare and check whether there whether there is a global systematic component between the two orbits or not. So, for one example day, I have:
and
So, I used "InstrumentEstimateHelmertTransformation" to get both the orbit differences and the Helmert parameters (please look at the screenshot).
By doing this, I got this error in the terminal:
I already used this program for comparing GNSS orbits which in that case a loop over the PRN numbers was set to read the data. Here, I have not set any loops, because I only want to see the Helmert transformation parameters between two daily files, but I did not succeeded to do so.
My question is how should I set up this program to compare two daily orbits? and how do you use it in comparing the LEO orbits processed at different centers?
Thank you in advance for you support and I am looking forward to hearing from you.
With kind regards,
Parisa
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