利用SLR数据进行北斗卫星广播星历精度分析

Precision Analysis of BeiDou Broadcast Ephemeris by Using SLR Data

卫星激光测距(satellite laser ranging,SLR)作为一种完全独立于微波测量的测距方法,为GNSS(global navigation satellite system)广播星历精度评估提供了独立的外部检核手段。基于2013年4月~2014年7月的北斗卫星SLR数据,对北斗卫星导航系统正式提供服务后的广播星历精度进行了评估,推导了北斗地球静止轨道卫星激光残差近似表达式,分析了不同姿态模式下北斗倾斜地球同步轨道卫星、中圆地球轨道卫星激光残差特性。检核结果表明了参与国际激光联测的北斗卫星C01星广播星历精度为0.97m、C08星为0.43m、C10星为0.41m、C11星为0.41m。

Satellite Laser Ranging （SLR）, is completely independent of microwave measurement, and offers an indispensable tool for external validation of GNSS broadcast ephemeris. Currently, all satellites in the BeiDou Satellite Navigation System （BDS） are equipped with laser ranging reflector arrays enabling high-precision two way ranging measurements. Based on SLR data from BeiDou satellites collected in the period April 2013 to July 2014, the broadcast ephemeris of BDS were validated using SLR data. The approximate equation of SLR residual for the BDS GEO satellites were derived, and the SLR residual characteristic for BDS IGSO and MEO satellites under different attitude modes were analyzed. The validation results show that, the orbit error of C01, C08, C10 and C11 are 0.97 m, 0.43 m, 0.41 m and 0.41 m respectively.