Abstract:The modeling of the GPS satellite clock is studied to improve and simplify the service mode of GPS satellite clock error, reduce the communication burden, and save storage space. This paper proposes to model and analyze satellite clock error by polynomial model and mixed function model with periodic part. The result shows the periodic part plays an important role in improving the accuracy of modeled satellite clock error: for rubidium clock, the clock error of Block ⅡF can reach an accuracy of 0.03 m (about 0.1 ns), and the clock error of Block ⅡR and ⅡR-M can reach an accuracy of 0.05 m (about 0.2 ns); However, the accuracy of cesium clock is lower by an order of magnitude. Analyzed by precise point positioning, the result shows the accuracy of the positioning results of the mixed function modeled clock error can reach the centimeter level with a 4 h convergence time. The above results show that, within certain areas of application, simple modeling parameters can take the place of the complicated clock error sequence, simplifying the service mode of GPS satellite clock error.
LIAO Xilin,LI Haojun,ZHAO Rungen. Modeling of GPS Satellite Clock Error and Its Application in Precise Point Positioning[J]. jgg, 2018, 38(8): 836-839.