利用激光测距数据对北斗广播星历进行评价

Validation of BDS precise orbits using satellite laser ranging

针对北斗卫星广播星历长时间序列精度变化的问题,采用SLR观测数据作为外部检核手段对2013年2月至2019年12月4颗BDS-2卫星和2018年8月至2019年12月4颗BDS-3卫星广播星历轨道精度进行评价与分析,其中BDS-2卫星广播星历精度均优于0.700 m, BDS-3卫星C20和C21优于0.500 m, C29和C30优于0.300 m;卫星进入地影期后,C01卫星广播星历精度下降0.036 m, BDS-2 IGSO/MEO卫星下降幅度最大为0.274 m, BDS-3卫星最大为0.070 m;IGSO/MEO卫星姿态控制模式转换后,BDS-2卫星下降幅度最大为0.265 m, BDS-3卫星最大为0.139 m。实验结果表明:地影期前后,BDS-2 IGSO/MEO卫星轨道精度下降最为明显,地影期偏航模式的改变对BDS-2卫星的影响大于BDS-3。

In view of the BDS broadcast ephemeris precision of long time series change, to evaluate and analyze the broadcast ephemeris orbit precision with the SLR observation data as a means of external check in February 2013 to December 2019 for four BDS-2 satellites and in August 2018 to December 2019 for four BDS-3 satellite, the broadcast ephemeris precision of BDS-2 satellites are better than 0.700 m, that of C20 and C21 which are BDS-3 satellites is better than 0.500 m and that of C29 and C30 is better than the 0.300 m;after the satellite entered the eclipse period, the broadcast ephemeris accuracy of C01 satellite decreased by 0.036 m, BDS-2 IGSO/MEO satellites decreased by 0.274 m, BDS-3 satellites decreased by 0.070 m. After the attitude control mode conversion of IGSO/MEO satellites, the maximum descent amplitude of BDS-2 satellites is 0.265 m, and that of BDS-3 satellites is 0.139 m. The experimental results show that the orbital accuracy of BDS-2 IGSO/MEO satellites decreases most obviously before and after the eclipse period, and the influence of the yaw mode change on BDS-2 satellites is greater than that on BDS-3 satellites.