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TBC GNSS Baselines: Hz/V Precision, RMS

  • 1.  TBC GNSS Baselines: Hz/V Precision, RMS

    Posted 02-17-2020 20:06

    Hi Trimble Team, I have questions from this baseline processing report:

    I think the horizontal and vertical precisions are calculated from the standard errors, which are calculated from the Aposteriori Covariance Matrix. Are these values completely theoretical or do they use the experimental std. dev. values from each satellite (sample in Figure 1)?

     

    Also, how is the RMS calculated? The TBC manual says this:

    Same question for RMS: Is this number theoretical or is it using the variability that was actually observed during the session (as shown in Figure 1)?

     

    Thanks!



  • 2.  Re: TBC GNSS Baselines: Hz/V Precision, RMS

    Posted 02-17-2020 20:13

    My pictures didn't come through...please click the following the link to see:

     

    https://ibb.co/72ZDJMq



  • 3.  Re: TBC GNSS Baselines: Hz/V Precision, RMS

    Posted 03-10-2020 16:17

    In part, yes. You have to tell TBC, in standard errors, how good different types of data is...because your  network adjustment can combine all types of data into the adjustment. So it needs to know how to weight the observations, e.g. total station is more accurate than GNSS.  Although I wish there was a standard error setting for RTK and static GNSS errors since RTK is less accurate than static, unless the "baseline processor" accounts for them differently already.