PPP and RTK integrated service method and performance based on regional reference station network
Shu Zhe Bao, Hui Liu, Wang Li, ZHANG Qin, HUANG Guanwen · DOAJ (DOAJ: Directory of Open Access Journals) · 2022
The GNSS regional reference station network can provide fast and precise positioning services for PPP and RTK users over the wide range. However, for different technical systems, the error influencing factors and service modes are different, the data processing methods at the server and the performance at positioning terminal will also vary. After fixing non-difference ambiguity of the reference station, this paper presents an integrated service method of PPP and RTK based on the regional reference station network, and comprehensively evaluates the terminal positioning performance for these two technologies. Experimental analysis are conducted by using CORS station network data with a station spacing of about 100km in a northwestern province. Results shows the positioning accuracy of PPP fixed solution using the integer clock/UPD product solved by the regional reference station network are very high, and the positioning error in horizontal direction can be less than 0.5 cm. The regional modeled atmospheric can significantly increase the initialization speed of the positioning terminal. For PPP and RTK, a fixed solution can be obtained in a single epoch of 60.0% and 87.7%. It should be noted that the RTK positioning based on the VRS mode is equivalent to strong atmospheric constraints. When the accuracy of modeling atmospheric delay is poor, the positioning accuracy will be significantly reduced, while the PPP-RTK positioning accuracy using virtual atmospheric constraints is almost unaffected.