Abstract
The real-time State Space Representation (SSR) product of the GNSS (Global Navigation Satellite System) orbit and clock is one of the most essential corrections for real-time precise point positioning (PPP). In this work, the performance of current SSR products from eight analysis centers were assessed by comparing it with the final product and the accuracy of real-time PPP. Numerical results showed that (1) the accuracies of the GPS SSR product were better than 8 cm for the satellite orbit and 0.3 ns for the satellite clock; (2) the accuracies of the GLONASS (GLObalnaya NAvigatsionnaya Sputnikovaya Sistema) SSR product were better than 10 cm for orbit RMS (Root Mean Square) and 0.6 ns for clock STD (Standard Deviation); and (3) the accuracies of the BDS (BeiDou Navigation Satellite System) and Galileo SSR products from CLK93 were about 14.54 and 4.42 cm for the orbit RMS and 0.32 and 0.18 ns for the clock STD, respectively. The simulated kinematic PPP results obtained using the SSR products from CLK93 and CLK51 performed better than those using other SSR products; and the accuracy of PPP based on all products was better than 6 and 10 cm in the horizontal and vertical directions, respectively. The real-time kinematic PPP experiment carried out in Beijing, Tianjin, and Shijiazhuang, China indicated that the SSR product CLK93 from Centre National d’Etudes Spatiales (CNES) had a better performance than CAS01. Moreover, the PPP with GPS + BDS dual systems had a higher accuracy than those with only a GPS single system.
Highlights
Precise Point Positioning (PPP) is one of the most widely-used approaches for high-precision real-time positioning with the development of multi-frequency global navigation satellite systems (GNSS)
Different from the real-time GPS orbit and clock products, the GLONASS products are only broadcasted in IGS03, CLK20, CLK70, CLK80, CLK93, and CAS01
It should be noted that the satellite orbits of R12 and R14 were absent in the products from IGS03, CLK70, CLK 80, CLK93, and CAS01 in the test period, and the result of R8 and R12 were absent in the products from CLK20 and CLK80, respectively
Summary
Precise Point Positioning (PPP) is one of the most widely-used approaches for high-precision real-time positioning with the development of multi-frequency global navigation satellite systems (GNSS). There are 30 global tracking stations, three data centers and eight analysis centers that can provide precise products to support satellite navigation technology testing, monitoring assessment, scientific research, and various applications [23].The Institute of Geodesy and Geophysics (IGG) of the Chinese Academy of Sciences (CAS), one of the iGMAS analysis centers, is beginning to develop multi-system real-time orbit and clock correction products with the advance of iGMAS. Real-time orbit and clock correction data generated by ACs in IGS-RTPP are released in SSR (State Space Representation) format in compliance with the RTCM standard and broadcasted via NTRIP (RTCM 2011). Where Vc is the speed of light in the vacuum; and ∆tb is the clock correction generated from the broadcast ephemeris
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