北斗卫星导航系统空间信号精度分析

Analysis on Signal-In-Space Error of Beidou Navigation Satellite System

按照空间信号测距误差(SISRE)的定义给出了北斗卫星SISRE的计算公式。利用2013年11月的实测数据及相应精密轨道钟差产品对北斗卫星轨道精度及SISRE进行了统计分析。结果表明:北斗系统non-GEO卫星广播星历轨道精度优于GEO卫星;各卫星广播星历轨道误差径向精度最好;GEO卫星SISRE均值优于4m,IGSO卫星SISRE均值优于3m,MEO卫星SISRE均值优于4m。

Different type Beidou Satellite＇s signal-in-space ranging error（SISRE） formulation is derived in this paper according to SISRE definition. SISRE of different type BeiDou satellites are assessed and analyzed on the basis of this SISRE formulation by using measured data and corresponding precise orbit/clocks products from November, 2013. The results show that the broadcast ephemeris orbit precision of BeiDou non-GEO satellites is better than that of GEO satellites; the precision of Bei- Dou Satellites broadcast ephemeris orbit errors in radial direction is the best. The average RMS SISRE of GEO satellites is better than 4 m, while for IGSO is better than 3 m and SISRE average value of MEO is better than 4 m.