BDS/GPS融合精密定轨理论与精度分析

Analysis on theory and accuracy of BDS/GPS precise orbit determination

针对BDS暂未具有覆盖全球的导航定位能力、卫星跟踪站几何结构不完善等问题,利用非差无电离层组合和动力学定轨原理,在同一时空基准下实现BDS/GPS融合精密定轨,并以武汉大学分析中心提供的最终产品为参考验证轨道和钟差精度。实验结果表明:融合定轨解算的GPS轨道3维精度优于4cm,卫星钟差精度达到0.07ns;BDS卫星的轨道精度与轨道类型有关;GEO卫星的轨道精度为米级,IGSO卫星的轨道精度为分米级,MEO卫星的轨道精度相对较高,3维精度为分米级,其中R方向精度可达厘米级。

Aiming at the problems that BDS has not covered the global range and the geometric structure of the satellite tracking stations is not perfect,the paer based on the non-difference non-ionospheric combination and the principle of dynamic orbit determination,proposed a method to realize the BDS/GPS combined precise orbit determination on the same coordinate systems and time systems.Finally,the accuracy of orbiting and clock errors were verified with the reference of the final products provided by Wuhan University Analysis Cente.Results showed that the accuracy of GPS orbit would be better than 4 cm,and that of the satellite clock errors would reach 0.07 ns;the orbit accuracy of BDS would be related to the satellite constellation structure;and the orbit precision of GEO would be meter level,that of IGSO would be decimeter,and that of MEO would be higher,reaching decimeter level,and even centimeter in Rdirection.