【作者】 郭磊； 龚学文； 王甫红； 刘万科； 凌三力；

【Author】 Guo Lei;Gong Xuewen;Wang Fuhong;Liu Wanke;Ling Sanli;School of Geodesy and Geomatics,Wuhan University;Collaborative Innovation Center of Geospatial Technology;

【机构】 武汉大学测绘学院； 武汉大学地球空间信息技术协同创新中心；

【摘要】 GNSS卫星星历的轨道误差和钟误差是影响LEO卫星实时精密定轨精度的重要误差源之一。本文采用不同精度等级的GNSS轨道与钟差产品,分别对国内外LEO卫星星载GNSS实测数据进行实时精密定轨模拟解算,分析不同精度的GNSS轨道与钟差产品对LEO卫星实时定轨的影响。结果表明:使用广播星历,LEO卫星可以获得0.3~0.4m精度的轨道参数;使用IGU/IGR卫星星历,可以获得0.1~0.3m精度的实时轨道参数;使用IGS最终精密星历,则可以获得优于0.1m精度的实时轨道参数。为我国空间信息网络导航卫星增强系统建设及其实时轨道精度指标设计提供参考。更多还原

【Abstract】 The GNSS satellite orbit and clock errors have great influence on precise real-time orbit determination for Low Earth Orbit(LEO) satellite.In this paper,simulation experiment of precise real-time orbit determination is carried on with the Terra SAR-X and HY2-A mission’s space-born GNSS data to analysis such influence.During which,different kinds of GNSS satellite orbit and clock products are used.The results show that LEO satellite 3 D orbit accuracies are at a level of 0.3~0.4 m with Broadcast ephemeris.Using ultra-rapid ephemeris or rapid ephemeris,3 D-accuracies of 0.1~0.3 m can be achieved.With final ephemeris,the LEO satellite orbit accuracies are better than 0.1 m.It is helpful for designing the accuracy index of LEO node in the future construction of space information network.更多还原