ACCURACY ANALYSIS OF GLONASS SATELLITESBROADCAST EPHEMERIS
Guo Jiming 1) ;Meng Xiangguang 1) ; Li Zonghua 2) ; and Nie Zhaosheng 3)
1)Shool of Geodesy and Geomatics, Wuhan University, Wuhan 4300792)Wuhan Urban Planning Information Center, Wuhan 4300143)Institute of Seismology, CEA, Wuhan 430071
Abstract On the basis of the characteristics of GLONASS satellites,the scheme for analyzing the error of GLONASS broadcast ephemeris was discussed. By comparing with IAC’s precise ephemeris and clock products, the performance of GLONASS orbit and clock error in broadcast ephemeris for all healthy GLONASS satellites in a period of 2 weeks were analyzed. The results show that the RMS of radial orbit error of current GLONASS broadcast ephemeris is less than 1 meter, the tangential one is less than 6 meters and the normal one is less than 4 meters. The RMS of GLONASS clock error in broadcast ephemeris is less than 15 nanoseconds. From the analysis of signalinspace range error, the whole accuracy of GLONASS satellites broadcast ephemeris is better than 4.5 meters.
