给出一种利用X射线脉冲星的平动点轨道自主导航算法.分析了X射线脉冲星导航原理,以脉冲到达时间差值为基本观测量,建立导航系统观测方程.在高精度星历模型下,对日地系L1点Halo轨道建立数学模型,利用基于UD分解的无迹卡尔曼滤波方法进行导航定位,并研究了摄动因素对导航结果的影响.仿真结果表明,在日地系平动点轨道的自主导航中,X射线脉冲星导航是可行的.%The application of X-ray pulsar navigation in libration point orbit was discussed. The principle of X-ray pulsar autonomous navigation was analyzed. Difference between the real time and the estimated time of pulse arrival was regarded as the basal measurement. The system model was the full ephemeris dynamic model of Halo orbit around L1 point of the Sun-Earth system. The Unscented Kalman Filter (UKF) based on UD factorization was applied to estimate the state of the system. Perturbation factors were discussed to analyze their influence on navigation precision. The simulation results demonstrate that this algorithm is feasible for the autonomous libration point orbit determination in the Sun-Earth system. The method that applies full ephemeris dynamic model and X-ray pulsar-based navigation principle can accomplish the autonomous navigation mission in the libration orbits. Besides, the navigation results are able to converge and the accuracy is enough to meet the navigation demand.
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