Initial orbit determination of BDS-3 satellites based on new code signals
Initial orbit determination of BDS-3 satellites based on new code signals
复制标题
基于新码信号的北斗三号卫星初轨确定
DOI：
10.1016/j.geog.2018.06.002
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发表时间：
2018-07-01
影响因子：
2.4
通讯作者：
Ou, Jikun
中科院分区：
文献类型：
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作者：
Ye, Fei;Yuan, Yunbin;Ou, Jikun
对于未来全球北斗导航卫星系统（BDS-3）新发射的两颗卫星（PRN号27和28），没有可用的广播星历数据和其他初始轨道信息，但初始轨道是卫星及其信号综合分析的基础。精确定轨还需要确定具有一定精度的先验初值，以避免定轨过程中出现滤波发散等问题。与依赖初值的牛顿迭代法相比，本研究采用Bancroft算法直接求解非线性方程，具有数值稳定性的优点。根据新编码信号计算了两颗卫星的初始轨道，并对计算结果进行了分析和讨论。实验结果表明，除极少数epoch外，使用新编码信号时，伪距离观测计算的观测残差和解算的初始轨道的中值和鲁棒方差因子分别小于4和2 m。该方案可用于新型北斗卫星机动后的快速初始轨道恢复。（三）中国地震局2018年地震研究所；由Elsevier B.V.代表KeAi Communications Co. Ltd制作和主持。
For the two newly launched satellites (PRN number 27 and 28) of the future global BeiDou navigation satellite system (BDS-3), there is no available broadcast ephemeris data and other initial orbit information, but the initial orbit is the fundamental of the comprehensive analysis of the satellites and their signals. Precise orbit determination (POD) also requires determination of a priori initial value with a certain precision in order to avoid problems such as filter divergence during POD. Compared with the Newton iteration method, which relies on the initial value, this study utilizes the Bancroft algorithm to directly solve the nonlinear equations with the advantage of numerical stability. The initial orbits of these two satellites are calculated based on new code signals, and their results are analyzed and discussed. The experimental results show that, with the exception of very few epochs, when the new code signal is utilized, the median and robust variance factor of the observed residuals computed using pseudo-range observations and the solved initial orbits are less than 4 and 2 m, respectively. It also shows that this solution can be used for rapid initial orbit recovery after maneuvers of the new BeiDou satellites. (C) 2018 Institute of Seismology, China Earthquake Administration, etc. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.