BDS-3新频点信号测距精度分析及定轨精度评估

Ranging accuracy analysis and precise orbit determination evaluation of BDS-3new frequency signals

针对BDS-3MEO和IGSO卫星新增播发的B1C&B2a频点信号,利用具备新频点信号接收能力的全球连续监测评估系统(iGMAS)和MGEX监测站观测数据,统计了不同频点信号载噪比,对BDS-3B1C&B2a频点信号的测距精度进行了分析,并利用新频点数据进行了BDS-3卫星定轨试验,通过重叠弧段和激光检核等手段对轨道精度进行了评估。结果表明:iGMAS测站对BDS-3新信号B1C&B2a的测距多径误差分别为0.43、0.24m,C19至C37号卫星新频点精密定轨重叠弧段三维位置精度达到0.072m,平均激光检核残差RMS为0.096m,测站坐标静态精密单点定位精度达到0.025m。

Aimming at the B1I&B3Ifrequency signals newly broadcasted by BDS-3MEO and IGSO satellites,the signal carrier-to-noise ratio(CNR)at different frequency points was calculated based on the observation data of International GNSS Monitoring&Assessment System(iGMAS)and Multi-GNSS experiment(MGEX)stations which are capable of receiving the new signals.Ranging accuracy of the BDS-3B1C&B2asignals was analyzed,and the orbit determination test of BDS-3satellites was carried out by using the new frequency data.The POD accuracy was evaluated by means of overlapping arcs and SLR validation.The results show that the multipath errors of the iGMAS stations for the new signals are 0.54mand 0.31m,respectively.The three-dimensional overlapping arcs accuracy of C19to C37with B1C&B2aobservations reaches 0.072 m.The RMS of SLR validation residuals is 0.096 m,and the station coordinates accuracy in static precise point positioning(PPP)reaches 0.025m.