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为提高平动点轨道探测器的自主导航能力,提出一种利用X射线脉冲星和太阳敏感器的导航算法.利用X射线脉冲星导航理论,用X射线探测器测量X射线脉冲到达时间,同时利用太阳敏感器测量太阳视线方向矢量,建立导航系统观测方程.在高精度星历模型下,对日地系Halo轨道建立数学模型,利用二级微分修正方法获取地球质心惯性系下的标称轨道,利用基于UD分解的联邦Unscented卡尔曼滤波方法进行状态估计,并研究了摄动因素对导航结果的影响.仿真结果表明,该方法能够完成日地系平动点轨道的自主导航,并且比X射线脉冲星单独导航具有更高的导航精度.
In order to improve the autonomous navigation capability of the track-point orbit detector, a navigation algorithm using X-ray pulsar and sun sensor is proposed. By using X-ray pulsar navigation theory, X-ray detector is used to measure the X-ray pulse arrival time Using the sun sensor to measure the direction of the sun’s line of sight, a navigation system observation equation is established.Under the high-precision ephemeris model, a mathematical model is established for the Halo orbit of the Japan-Earth System, and a second order differential correction method is used to obtain the nominal orbit , The state estimation is carried out by using the Unscented Kalman filter based on UD decomposition and the influence of perturbation factors on the navigation results is studied.The simulation results show that this method can accomplish the autonomous navigation of the geostationary-point orbit of the geostationary system, Ray Pulsar alone navigation with higher navigation accuracy.