I’ld like to better get used to RTKLib and understand/interprete it’s output.
(Main reason is I hope to do some additional tests to verify signal quality, as advised in Cycle slips? or not?)
I tried various sessions of postprocessing with different parameters to at least get similar results like other kind people who are helping out. For some reason, I often seem to choose sub-optimal settings.
How to choose correct settings? Is it based on experience and interpretation of the setup/signal quality, or is it just trial/error/choose the ‘best’? (or reject what’s definitely wrong)
(Lately I’ve seen better results (fix-ratio) with L1-only vs L1+L2)
All screenshots below are from processing the logs of the thread I referred to above.
the blue (solution2)-data always is from the in-field-real-time solution logged by RS2 itself.
Note about the data: The RTCM-stream was provided by VRS over 3G connection, and the latter had outages up to 30 seconds.
During outage of the RTCM stream, the age of differential, is similar between the real-time and the post-processed data, as expected. But in a significant amount of the cases, it looks like the post-processed data somehow ‘finds data’ and it’s age of differential drops to 0. Is there an explanation for this? or is it a possible bug?
While changing the parameters to get a ‘better fix ratio’, I only get more false fixes (compared to the in-field-solution which looks like the correct path). I don’t know if it’s coincidence, but this false fix is often obtained a very short time after the behaviour described in the previous question. (even with an outage of 2 seconds, where the post-processing doesn’t see the outage - maybe the data did arrive, just not in time…), and although it’s a false fix, it’s perfectly parallel with the true solution. Is this just because of the limited number of usable satellites?
In RTKPost I can choose between L1/2/5, and in RTKPlot L1/2/7. Are 5 and 7 the same?
Also the PP-tutorial says Beidou is using L1&L7, but I only get data in RTKPlot for L2&L7
The number of satellites in the real-time solution file is consistently ca 10 higher than when doing PP. Does the number have another meaning (also the ones filtered by SNR/elevation?), or is it really using more satellites?
PS. Sorry for the long post, tried to keep it organised (and I thought is was better than creating 5 topics)