北斗三号系统开通前后广播星历精度对比分析

Comparative analysis of broadcast ephemeris accuracy before and after the opening of BDS-3 system

北斗三号卫星导航系统(BDS-3)开通已一年有余,通过研究2019-08—2021-08共2 a的北斗卫星导航系统(BDS)广播星历数据,采用事后精密星历对北斗二号卫星导航系统(BDS-2)和BDS-3卫星的轨道、钟差和空间信号测距误差(SISRE)进行分析.结果表明:BDS-3系统开通后,卫星轨道精度比BDS-2提升明显,径向(R)误差均方根(RMS)值从0.87 m左右提升至优于0.23 m,精度提升约74%,3D误差RMS值从1.63 m以内提升到优于0.75 m,精度提升约54%;氢原子钟和铷原子钟精度相当,BDS-3钟差误差RMS值精度提升与BDS-2提升基本相同,精度提升约1 ns;SISRE精度比对中,BDS-2 SISRE的RMS值从0.9 m提升到0.7 m,BDS-3从0.8 m提升到0.5 m.综合比较,BDS-3系统性能提升较大.

BeiDou-3 Navigation Satellite System(BDS-3) has been in operation for more than one year.By studying the BeiDou Navigation Satellite System(BDS) broadcast ephemeris data from August 2019 to August 2021,the orbit,clock error and signal-inspace ranging error(SISRE) of BeiDou Navigation Satellite(regional) System(BDS-2) and BDS-3 satellites are analyzed by using the post precision ephemeris.The results show that after the BDS-3 system is opened,the satellite orbit accuracy is significantly higher than that of BDS-2.The radial error root mean square(RMS) value is improved from about 0.87 m to better than 0.23 m,the accuracy is improved by about 74%,and the 3D error RMS value is improved from less than 1.63 m to better than 0.75 m,the accuracy is improved by about 54%;The accuracy of hydrogen atomic clock and rubidium atomic clock is the same.The accuracy improvement of RMS value of BDS-3 clock error is basically the same as that of BDS-2,with an accuracy improvement of about 1 ns;In SISRE accuracy comparison,the RMS value of BDS-2 SISRE is increased from 0.9 m to 0.7 m,and BDS-3 SISRE is increased from 0.8 m to 0.5 m.through comprehensive comparison,the performance of BDS-3 system is greatly improved。