星载BDS/GPS低轨卫星定轨精度分析

针对低轨卫星搭载BDS/GPS接收机实现定轨将成为定轨领域热点的现状,该文讨论了基于星载BDS/GPS实时定轨和精密定轨需要考虑的数学模型,阐述了实时定轨和精密定轨的模型差异。基于自主研发程序,利用高动态信号仿真器仿真的星载BDS/GPS数据研究了基于星载BDS/GPS实时定轨和精密定轨的可行性及其能达到的精度。试验结果表明,星载BDS/GPS实时定轨位置精度为1.19m,速度精度为2.35mm/s。GPS信号发生中断时即仅采用BDS观测数据进行实时定轨时,三维位置误差达到3.73m;星载BDS/GPS精密定轨位置精度为2.30cm,仅采用BDS观测数据进行精密定轨时,三维位置误差可达到8.26cm。

Precision analysis of orbit determination with space-borne BDS and GPS measurements for LEO satellite

Based on real-time orbit determination and precision orbit determination with space-borne BDS and GPS measurements,the mathematical models of real-time orbit determination and precision orbit determination with space-borne BDS and GPS measurements was put forward in this paper in order to deal with the issues in real-time orbit determination and precision orbit determination of LEO satellite with BDS and GPS receiver.And then the difference of real-time orbit determination and precise orbit determination was presented in details.Based on the self-developed program,feasibility and precision of real-time orbit determination and precision orbit determination were analyzed using the stimulated BDS and GPS measurements generated by high dynamic signal simulator.The results showed that the orbit accuracy of real-time orbit determination with space-borne BDS and GPS measurements can achieve 1.19 meter and the velocity accuracy can achieve 2.35 millimeter per second.The orbit accuracy of real-time orbit determination with space-borne BDS measurements only can achieve 3.73 meter when the GPS signals were unavailable.And that the orbit accuracy of precision orbit determination can achieve 2.30 centimeter.The orbit accuracy of precision orbit determination with space-borne BDS measurements only can achieve 8.26 centimeter.