针对BDS区域卫星导航系统的空间信号精度评估问题,分析利用精密星历进行空间信号评估的算法以及SISURE的投影原理,讨论BDS不同星座的参数选择。估计BDS各个卫星的空间信号精度,估算出SISURE综合误差的平均值为1.54m,与GPS的空间信号精度还存在一定差距。针对个别导航卫星某些分量误差偏大的情况进行分析,发现GEO卫星SISURE个别时段较差和轨道机动有一定关系,并明确了BDS实际的空间信号精度,可为BDS用户提供一定参考。
For signal-in-space accuracy assessment of the BDS regional satellite navigation system,this paper analyzes the use of precise ephemeris algorithms for spatial signal evaluation and the projection principle of SISURE.Further,it discusses the parameters for BDS of different constellations.In the examples,this paper estimates the signal-in-space accuracy in BDS of various satellites,and finds that the average SISURE grated error reaches 1.54 m,and that there is still a gap between BDS and GPS.This paper also analyzes larger signal-in-space errors of some satellite components and finds some important conclusions.