基于单差短基线的北斗观测值域多路径误差滤波算法

Observation domain filtering based on single differences for mitigating Bei Dou multipath error of short baselines

北斗卫星导航系统是中国自行研制的继美国GPS和俄罗斯GLONASS之后第三个成熟的卫星导航系统。由于北斗系统MEO卫星轨道周期与GEO、IGSO卫星轨道周期差异较大,传统基于坐标值域的多路径误差恒星日滤波算法改进效果有限。本文提出了一种基于单差的观测值域多路径误差滤波算法用于改善北斗短基线定位结果,该算法能有效改善每颗卫星观测数据中的周期性多路径误差。实验结果显示,该方法能有效提升定位精度,并且改善幅度大于传统的坐标值域恒星日滤波算法。

The Bei Dou Navigation Satellite System（ BDS） is Chinese self-developed satellite navigation system after the U. S. Global Positioning System（ GPS） and the Russian GLONASS. The improvement of traditional sidereal filtering based on the coordinate domain is limited due to the orbital period difference between MEO satellites and GEO,IGSO satellites. In this paper,we represent a new observation domain filtering based on single differences to mitigate multipath when processing Bei Dou short baselines. The results show that this method can improve the accuracy of short baseline positioning,what is more,it performs better than traditional sidereal filtering based on the coordinate domain.