GEO and IGSO joint precise orbit determination

Experiments and analyses are carried out for GEO and joint GEO/IGSO precise orbit determination using data recorded by China’s regional tracking network. Results show that joint GEO/IGSO orbit determination effectively solves the problem of poor observation geometry for GEO satellites. The laser radial evaluation thus confirms that precision is as good as less than 0.1 m. In the case of joint orbit determination, solving the empirical acceleration can reduce errors introduced by the imprecise solar radiation pressure model used for Chinese satellites. This method also improves the accuracy of orbit prediction in the radial direction. The ephemeris accuracy is thus improved and the ephemeris can provide a better service to users with navigation and positioning requirements.