Özet:

In recent years, real-time and post-processing evaluation applications have become common with the Precise Point Positioning (PPP) method. It has been seen that the PPP method provides cost and time advantages by obtaining high position information at the level of dm/cm with a single GNSS receiver, without the need for one or more reference stations compared to other positioning techniques. Within the scope of the study, it was aimed to determine the effect of PPP error sources on point location accuracies by using PPPH software, which allows obtaining position information with the post-measurement-PPP (Post Processing, PP-PPP) technique. For this purpose, ten-day (3.04.2021-12.04.2021) observation data of BALK, SINP, YOZ1, IGR1 and ONIY TUSAGA-Aktif stations were analyzed. In evaluation used only-GPS satellite system preferably and without any reason, instead of multi-GNSS observations. The results obtained from the PPPH software were compared with the reference coordinate values of the CSRS-PPP service of the stations. Considering the root mean square error values in the study, an average position accuracy of 0.8 cm horizontally and 10.6 cm vertically was achieved in the tropospheric delay correction, while a position accuracy of 0.75 cm and 1.0 cm was achieved in the relativistic distance correction respectively. The obtained results clearly demonstrate that tropospheric delay correction has the most impact on the location accuracy of the error source, while relativistic distance correction has the least impact on the location accuracy of the error source

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