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卫星精密轨道的确定是北斗卫星导航系统位置与服务的核心技术之一,而国家基准站是影响卫星轨道精度的一个重要因素。本文基于中国测绘科学研究院国际GNSS监测与评估中心自主开发的软件计算国家基准站和MGEX站对北斗卫星精密定轨的影响。得出结果:加上国家基准站后GEO卫星轨道精度平均能达到2.0 m,比没有国家基准站时提高约14%,在GEO切向方向改善最为明显,大约提高30%。IGSO和MEO卫星也有所提高。加上国家基准站后,三类卫星的轨道重复弧段的径向精度优于5 cm。有了国家基准站数据BDS精密轨道会有明显的改善。国家基准站的建立使我国北斗导航卫星的服务能力有很大提高。
The determination of satellite precision orbit is one of the core technologies of the location and service of Beidou satellite navigation system, and the national reference station is an important factor that affects the orbit accuracy of a satellite. Based on the software developed independently by the International GNSS Monitoring and Evaluation Center of China Academy of Surveying and Mapping, this paper calculates the influence of National Reference Station and MGEX Station on Beidou satellite orbit determination. The results show that the GEO satellite orbital accuracy can reach an average of 2.0 m after the addition of the national base station, an increase of about 14% when compared with no national base station, and the most obvious improvement in the GEO tangential direction is about 30%. IGSO and MEO satellites have also been raised. With the addition of a national base station, the radial accuracy of the orbital repeat arcs of the three types of satellites is better than 5 cm. With the national benchmark data BDS precision orbit will be significantly improved. The establishment of a national benchmark has greatly enhanced the service capability of our BeiDou navigation satellite.