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 thube...@web.de. Thank you very much in advance for your help!
Best regards,
Tobias Huber
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