基于星间距离测量的高精度自主导航

High-Accuracy Autonomous Navigation Based on Inter- Satellite Range Measurement

研究利用地球卫星和月球卫星之间的测距信息进行自主导航的方法.基于三体摄动轨道动力学方程和星间测距信息,可以同时确定参与导航的地球卫星和月球卫星的绝对位置;但是在初始位置误差较大的情况下,导航系统的定位性能会受到影响.为了解决这一问题,提出基于"星间测距+紫外导航敏感器"的组合导航方法.采用该导航方法,能够在初始位置误差和紫外导航敏感器测量误差较大的情况下实现高精度自主导航.基于Cramer-Rao下界(CRLB)分析了组合导航系统的性能,并通过数学仿真验证了该导航方法的有效性.

This paper studies the autonomous navigation method based on the range measurement between an Earth satellite and a Lunar satellite. The absolute positions of all participating satellites can be deter- mined simultaneously by using the three-body orbital dynamics and the inter-satellite range measurement. However, the positioning performance of the navigation may be degraded in the presence of large initial position error. In order to cope with this problem, a novel navigation method is proposed by integrating an ultraviolet navigation sensor and the inter-satellite range measurement. By using the proposed navigation method, high positioning accuracy is achievable in the presence of the large initial position error and large measurement noise of the ultraviolet sensor. The performance of the integrated navigation system is ana- lyzed by using the Cramer-Rao lower bound （CRLB）. The feasibility of the proposed method is verified via numerical simulations.