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Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers

Academy of Opto-Electronics, Chinese Academy of Sciences, 9 Dengzhuang South Road, Haidian District, Beijing 100094, China
University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China
School of Environment and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou 221116, China
Authors to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2018, 7(3), 85;
Received: 15 January 2018 / Revised: 24 February 2018 / Accepted: 7 March 2018 / Published: 8 March 2018
PDF [8958 KB, uploaded 8 March 2018]


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. View Full-Text
Keywords: precise point positioning; orbits and clocks; state space representation; analysis centers precise point positioning; orbits and clocks; state space representation; analysis centers

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Wang, Z.; Li, Z.; Wang, L.; Wang, X.; Yuan, H. Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers. ISPRS Int. J. Geo-Inf. 2018, 7, 85.

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