Base coordinates acquisition time

[amdubois]

Hello again,

I’m curious to know what are the recommendations about average time interval for RS2+ base coordinate mean single acquisition?

Is there a time vs precision ratio? Also, EmlidFlow app caps at 30 mins. Is it because there is no precision gain passed that interval ?

Thanks,

[ruth.bongon]

Hi @amdubois,

If the base is averaged in Single, its position is only a few meters accurate. In this case, longer averaging in the single mode won’t increase the accuracy.

Are you also planning to post-process the data to tie the measurements to global coordinates? Or do you only need relative accuracy for your projects?

[amdubois]

Hi Ruth,

Yes we do post-processing afterwards. So you are saying that the length of averaging won’t change anything in the post-processed precision?

[ruth.bongon]

Hi @amdubois,

Yes, with PPK, averaging it longer will not improve its accuracy.

RINEX observation file typically contains raw observation data from the GNSS receivers, including pseudorange, carrier phase, Doppler, and signal-to-noise ratio (SNR) measurements. This raw data is uncorrected and represents the signals received directly from the satellites without post-processing.

Also, the base position in the RINEX header is the last averaged epoch coordinate with an accuracy of a few meters. It is different from the one averaged in Emlid Flow. Thus, your RTK and PPK base positions may differ by several meters.

If you need absolute accuracy, you can obtain the precise position of the base by uploading your RINEX observation file in OPUS (if you are in the US) or using a PPP service like NRCAN.

Static Processing can also be an option here.