Evaluation of BDS-3 Orbit Determination Strategies Using Ground-Tracking and Inter-Satellite Link Observation
Evaluation of BDS-3 Orbit Determination Strategies Using Ground-Tracking and Inter-Satellite Link Observation
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利用地面跟踪和星间链路观测评估北斗三号定轨策略
DOI：
10.3390/rs12162647
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发表时间：
2020-08
期刊：
影响因子：
5
通讯作者：
Xing Wang
中科院分区：
文献类型：
--
作者：
Yifei Lv;Tao Geng;Qile Zhao;Xin Xie;Feng Zhang;Xing Wang
为了提高精密定轨的精度，可以引入BDS-3卫星的双星间链路伪距作为附加测量，同时引入L频段伪距和相位。在现有的研究中，虽然无时钟或无几何的ISL观测值是由原始的两个单向伪距推导出来的，但对于ISL联合POD(Joint 1 POD)，只采用了无时钟的观测值，而没有考虑几何无关观量。本文采用了一种改进的联合(Joint 2POD)策略，充分利用了无时钟和无几何的观测数据。通过轨道重叠差、卫星激光测距(SLR)残差和同时估计的卫星钟差特性，综合比较了地面POD、ISL纯POD、联合1 POD和联合2 POD的轨道。比较表明，无论卫星类型如何，联合2POD策略的性能均优于其他三种POD策略。此外，本文还从站点的数量和分布两个方面讨论了ISL对站点选择策略的贡献。实验结果表明，当卫星数目超过20个时，每增加10个站，中轨、IGSO和GEO卫星的三维精度最大分别提高7.5%、3.9%和2.8%。当观测站数达到50个时，精确轨道的精度与使用80个观测站的结果相近。此外，加入ISL数据后，用10个区域站和10个全球站估计的轨道有了很大提高，它们之间的三维误差精度仅为0.9厘米。
Dual one-way inter-satellite link (ISL) pseudoranges of BDS-3 satellites can be introduced as an additional measurement along with L-band pseudoranges and phases to improve the accuracy of precise orbit determination (POD). In the existing research, although the clock-free or geometry-free ISL observables are derived from the raw two one-way pseudoranges, only the clock-free observables are adopted for the ISL joint POD (Joint 1 POD) without considering the geometric-free observables. An improved joint (Joint 2 POD) strategy making full use of the clock-free and geometry-free observables is applied in this contribution. The orbits of ground-only POD, ISL-only POD, Joint 1 POD, and Joint 2 POD are comprehensively compared by the orbit overlapping differences, the Satellite Laser Ranging (SLR) residuals, and the characteristics of the satellite clock offsets estimated simultaneously. The comparisons prove that the performance of the Joint 2 POD strategy is better than that of the other three POD strategies regardless of the types of satellites. Moreover, this paper discusses ISL’s contribution to the station selection strategy in terms of the number and distribution. The experimental results show that, when there are more than 20 stations, each additional 10 stations contributes to a maximum of 7.5%, 3.9%, and 2.8% improvement on MEO, IGSO, and GEO satellites 3D accuracy, respectively. When the number of stations reaches 50, the precise orbits achieve similar accuracy to the results using 80 stations. In addition, after adding ISL data, the orbits estimated using 10 regional stations and 10 global stations are greatly improved, and the accuracy between them is only 0.9 cm in 3D errors.
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影响因子：
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作者：
Ren Xia;Yang Yuanxi;Zhu Jun;Xu Tianhe
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DOI：
10.1002/navi.295
发表时间：
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影响因子：
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通讯作者：
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DOI：
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发表时间：
2003-09
期刊：
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影响因子：
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