铁路连续运行基准站BDS-3信号质量及PPP性能分析

Analysis of signal quality and PPP performance of BDS-3 for continuously operating reference stations on railways

为评价当前铁路沿线建立的连续运行基准站网的北斗三号卫星导航系统(BDS-3)信号的可靠性,使用G-Nut/Anubis对BDS-3的B1I/B3I和B1C/B2a信号进行观测数据质量分析,并基于无电离层组合精密单点定位(PPP)观测模型,分别采用欧洲定轨中心(CODE)、欧洲航天局(ESA)和德国地学研究中心(GFZ)的精密轨道和钟差产品进行B1I/B3I、B1C/B2a两种BDS-3双频组合静态PPP解算。与全球定位系统(GPS)对比的结果表明,BDS-3采用CODE产品和B1I/B3I组合模型可以达到最优的定位性能,结果精度与GPS相当。因此,在铁路连续运行基准站网测量应用中可以使用单北斗卫星导航系统(BDS)。

To evaluate the reliability of Beidou-3 navigation satellite system(BDS-3)signals in the continuously operating reference station network established along the existing railway,the observation data quality of BDS-3’s B1I/B3I and B1C/B2a signals was analyzed using G-Nut/Anubis.Based on the ionosphere-free combined precise point positioning(PPP)observation model,precise orbit and clock offset products from the Center for Orbit Determination in Europe(CODE),European Space Agency(ESA),and Deutsches Geo Forschungs Zentrum(GFZ)were used to perform static PPP solutions for two BDS-3 dual-frequency combinations:B1I/B3I and B1C/B2a.The comparison with global positioning system(GPS)results shows that BDS-3 achieves optimal positioning performance when using CODE products and the B1I/B3I combination model,with accuracy comparable to GPS.Therefore,the single Beidou navigation satellite system(BDS)can be applied in the measurement of the continuously operating reference station network on railways.