The contribution of intersatellite links to BDS ‐3 orbit determination: Model refinement and comparisons
The contribution of intersatellite links to BDS ‐3 orbit determination: Model refinement and comparisons
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DOI：
10.1002/navi.295
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Chen Wang;Qile Zhao;Jing Guo;Jing-nan Liu;Gucang Chen
中科院分区：
文献类型：
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作者：
Chen Wang;Qile Zhao;Jing Guo;Jing-nan Liu;Gucang Chen
到2018年底，中国北斗卫星系统（BDS）已进入全球范围覆盖的第三阶段（BDS-3）。本研究提出并验证了一个修改的建模方面的星间链路（ISL）的硬件延迟估计。BDS-3的精确定轨（POD）结果沿着这方面的工作，以及ISL终端的校准相位中心偏移（PCO），有助于提高轨道精度。在载入ISL数据后，使用区域和全球地面站进行另外两套POD解决方案。在ISL数据用于POD之后，区域病例可以实现约40%的改善，全球病例可以实现约20%的改善。当轨道重叠差的平均3D均方根可以达到20 cm左右，并且通过6小时预测时钟和轨道解得到的信号空间距离误差（SISRE）显示平均值为25 cm时，利用全球地面站和ISL的观测获得最佳POD性能解。
By end‐2018, the Chinese BeiDou satellite system (BDS) has entered its third phase of global scale coverage (BDS‐3). This study presents and validates a modified modeling aspect concerning an intersatellite link (ISL) hardware delay estimation. The precise orbit determination (POD) results of BDS‐3 demonstrate this aspect along with calibrated phase center offsets (PCOs) of the ISL terminal to help improve the orbit accuracy. After onboarding the ISL data, two additional sets of POD solutions using regional and global ground stations are conducted. About a 40% improvement can be achieved for regional cases and 20% for global cases after ISL data were used for POD. The best POD performance solution is obtained with observations from both the global ground stations and ISL when the averaged 3D root mean squares of the orbit overlapping differences can reach around 20 cm and the signal‐in‐space range errors (SISREs) obtained by 6‐hour predicted clock and orbit solutions show an average value of 25 cm.