[FOSS-GPS] Introducing myself + Question regarding RTKlib v2.4.2 p13

Amir Allahverdi am.allahverdi at gmail.com
Sun Sep 26 05:19:49 PDT 2021

Dear Tobias,

Can you send me your observations to check?


On Sat, Sep 25, 2021 at 5:47 PM <thuber25 at web.de> wrote:

> Hello there,
> as a new member of the mailing list, I first want to introduce myself: I
> am a university geodesy student at Technical University of Munich, Bavaria,
> Germany, and currently I'm writing on my master's thesis about
> investigation of Precise Point Positioning (PPP) for static performance.
> For that reason, I use the free software RTKlib version 2.4.2 p13 for
> postprocessing of RINEX data. The observation time for all investigated
> stations holds about 1.75 hrs.
> For that, I use IGS correction data together with RINEX observation data
> of GPS, GLONASS, Galileo and BeiDou. In one of my tries, I selected the
> mode "PPP Static" with combined Kalman filtering (forward and backward),
> where for each epoch (data sampling rate 1s) a solution is generated. The
> attached picture shows the 2D groundtrack solution for one station with
> these settings; the result of the first epoch is specially marked.
> My question now is: Can anybody answer why this groundtrack solution seems
> to fulfill a "loop", i. e. why the positioning solution for first and last
> epoch are that close to each other (I have checked: They are not
> identical!!). I have already tried to find out about PPP static mode in
> RTKlib, but without success, so far :(.
> If anybody can help, I would be very pleased about an answer to my e-mal
> thuber25 at web.de. Thank you very much in advance for your help!
> Best regards,
> Tobias Huber
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