联合星地与星间Ka伪距的北斗三号卫星一体化定轨和时间同步  

Integrated orbit determination and time synchronization for BDS-3 satellites with satellite-ground and inter-satellite one-way Ka-pseudoranges

作　　者：阮仁桂[1,2,3] 贾小林 朱俊[4] 呼延宗泊 冯来平 李杰 RUAN Rengui;JIA Xiaolin;ZHU Jun;HUYAN Zongbo;FENG Laiping;LI Jie(Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China;State Key Laboratory of Geo-Information Engineering, Xi’an 710054, China;Information Engineering University, Zhengzhou 450052, China;State Key Laboratory of Astronautic Dynamics, Xi’an 710043, China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理信息工程国家重点实验室,陕西西安710054 [3]信息工程大学,河南郑州450052 [4]宇航动力学国家重点实验室,陕西西安710043

出　　处：《测绘学报》2020年第3期292-299,共8页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41704035;41774012)~~

摘　　要：北斗三号卫星之间及卫星与锚固站之间在Ka频段的伪距测量为其提供了一种不依赖于地面监测站的独立定轨和时间同步能力。本文针对星间链路分时测量的特点,采用分段一次多项式对卫星钟差进行建模,直接利用原始的星地和星间单程Ka伪距实现一体化定轨和时间同步并同时解算锚固站设备硬件时延。利用北斗三号8颗卫星和2个锚固站的实测Ka伪距数据进行验证,结果表明:在利用导航电文的预报钟速信息进行修正的情况下,星间Ka伪距残差RMS为0.052 m;R方向卫星轨道确定和预报精度(RMS)分别为0.016、0.033 m;卫星钟差估计和预报精度(95%)分别为0.038、0.992 ns;解算得到的锚固站收发设备时延之和的稳定性优于0.5 ns。试验还展示了该方法的适应能力:在没有预报钟速信息的极端情况下,虽然星间Ka伪距残差RMS增大了242%,但R方向轨道确定和预报精度仍分别达到0.021、0.041 m,钟差估计和预报精度分别达到0.040、1.092 ns。The Ka-band pseudoranges measured between satellites and between satellites and anchor stations provide the third-generation BeiDou navigation satellite system(BDS-3)an alternate approach to achieve orbit determination(OD)and time synchronization(TS)which is completely independent of monitoring stations.In this paper,by modeling the clock offsets with piece-wise linear polynomials,we directly process the inter-satellite(IS)and satellite-ground Ka-pseudoranges to conduct integrated OD and TS with simultaneously estimation for the hardware delay of anchor stations.Experiments with real Ka-pseudorange data observed at 8 BDS-3 satellites and 2 anchor stations are carried out.It is demonstrated that,with the broadcast clock drift corrections,the RMS of IS Ka-pseudorange residuals is 0.052 m;the accuracy(RMS)in radial direction of the estimated and predicted orbits are 0.016 and 0.033 m,respectively;the accuracy(95%)of the estimated and predicted clocks are 0.038 and 0.992 ns,respectively.The standard deviations of estimated hardware delays of anchor stations are smaller than 0.5 ns.The proposed method is adaptable as it also works even if no predicted clock drift is available.In this extreme case,the RMS of the IS pseudorange residuals is dramatically increased by 242%;However,the accuracies are 0.021 m and 0.041 m for the estimated and predicted orbits,respectively,while 0.040 ns and 1.092 ns for the estimated and predicted clocks,respectively.

关 键 词：星间链路 锚固站 单程Ka伪距 设备时延 钟速改正 

分 类 号：P228[天文地球—大地测量学与测量工程]