一种快速的集中式自主定轨新算法

发布时间：2018-05-21 14:54

本文选题：星间链路 + 自主定轨　；参考：《测绘科学技术学报》2016年05期

【摘要】：针对导航星座自主定轨,提出一种提高集中式算法效率的新思路,即充分利用高频、高精度的星间链路测距信息,在短弧内将卫星最优轨道与长期预报轨道的差异用多次曲线描述,得到卫星位置和速度的最佳估值。此方法无需动力学建模和计算状态转移矩阵,因此算法极为简洁。同时,对于自主运行期间缺乏空间基准,提出约束轨道升交点赤经的方法,以减小对地面系统的依赖程度。仿真结果表明,导航星座自主运行60 d,不考虑地球自转参数(EOP)长期预报误差,在无锚固站的情况下,链路数不少于5条时能够达到轨道URE优于1 m,位置3 m,速度毫米级的定轨精度。最后,通过比对验证了新算法比已有EKF分布式自主定轨算法的效率更高。
[Abstract]:In view of autonomous orbit determination of navigation constellation, a new idea to improve the efficiency of centralized algorithm is proposed, which is to make full use of high-frequency and high-precision intersatellite link ranging information. In the short arc, the difference between the optimal satellite orbit and the long term forecast orbit is described by multiple curves, and the best estimation of the satellite position and velocity is obtained. This method does not require dynamic modeling and calculation of state transition matrix, so the algorithm is very simple. At the same time, for the lack of space datum during autonomous operation, a method of constraining orbit elevation and intersection red longitude is proposed to reduce the dependence on the ground system. The simulation results show that the navigation constellation operates independently for 60 days, and the long-term prediction error is not taken into account in the earth rotation parameters (EOPs). In the case of no anchoring station, When the number of links is not less than 5, the orbit determination accuracy of orbit URE is less than 1 m, position is 3 m and speed is millimeter. Finally, the comparison shows that the new algorithm is more efficient than the existing EKF distributed autonomous orbit determination algorithm.
【作者单位】：北京卫星导航中心;
【基金】：国家自然科学基金项目(11103068) 国家科技基础性工作专项(2015FY310200)
【分类号】：P228.4

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