北斗卫星广播星历精度分析

讨论了BDS卫星广播星历精度分析方案，通过BDS卫星广播星历与IGS MGEX的GBM分析中心精密星历产品进行比较，统计分析连续一个月所有在轨健康BDS卫星的广播星历轨道及钟差的误差特性。结果表明：1）当前BDS卫星广播星历轨道误差的径向均方根误差在1 m以内，GEO类型卫星的轨道切向、法向精度在8 m以内，IGSO、MEO类型卫星的轨道切向、法向精度在4 m以内；2）BDS卫星钟差误差与轨道类型没有关系，其精度在10 ns左右；3）从空间信号测距误差（SISRE）角度分析，BDS卫星广播星历整体精度与BDS卫星轨道类型关系不明显，BDS卫星广播星历整体精度优于2 m。

Precision Analysis of Beidou Satellites’ Broadcast Ephemeris

This paper discusses the scheme for analyzing the error of BDS broadcast ephemeris. By contrasting with IGS MGEX’s precise ephemeris and clock products, this paper presents statistics of orbit and clock error of broadcast ephemeris of all in-orbit BDS satellites for a period of 31 d. The results show that: 1)The RMS of radial orbit error of current BDS broadcast ephemeris is less than 1 m, tangential and normal RMS is less than 8 m for GEO satellites, and tangential and normal RMS is less than 4 m for IGSO and MEO satellites. 2)The RMS of BDS clock bias error has no relationship with orbit types and is less than 15 ns. 3)From the perspective of signal-in-space range error, the relationship of the overall accuracy of BDS satellites broadcast ephemeris and orbit type is not clear and the overall accuracy is less than 2 m.