Abstract: The determination of satellite precision orbit is one of the core technologies of BeiDou satellite navigation system location and service, and the national reference station is an important factor affecting satellite orbit accuracy. In this paper, based on the software developed by the international GNSS monitoring and evaluation center of China Academy of Surveying and Mapping, the impact of the national reference station and MGEX station on the precise orbit determination of the Beidou satellite is analyzed. The results show that the average accuracy of the GEO satellite orbit can reach 2.0 m, which is about 14% higher than that of the national reference station, and the most obvious improvement in the tangential direction of GEO is about 30%. IGSO and MEO satellites also improved. After adding the national reference station, the radial precision of the three types of satellite orbit repeat arc is better than 5 cm. With the national reference station data BDS precise track will be significantly improved. The establishment of national reference station makes the service ability of BeiDou navigation satellite greatly improved.

Key words: national reference station, BeiDou, precise orbit