修正钟差和方位误差的X射线脉冲星导航

X-ray Pulsar Navigation to Correct for Clock Errors and Direction Errors

为了减小时钟漂移和脉冲星方位误差对自主导航系统的影响,提出了一种考虑钟差修正和方位误差的脉冲星导航方法;X射线脉冲星导航以脉冲到达时间为量测量,同时将星载时钟钟差和方位偏差造成的系统偏差作为增广状态构成状态变量,建立导航系统,利用无迹卡尔曼滤波器(unscented Kalman filter,UKF)进行状态估计;仿真结果表明,该方法可以抑制方位偏差对导航的影响,控制星载时钟钟差,同脉冲星导航相比,该方法提供更高的导航估计精度。

In order to reduce the impact of clock drift and pulsar direction error on the autonomous navigation system,a method of pulsar navigation considering clock error correction and a direction error is proposed.X-ray pulsar navigation is measured by pulsearrival time,sets the clock error and the system deviation caused by the direction error of the on-board clock as the augmented state to form the state variable,establishes the navigation system,and uses unscented Kalman filter（UKF）controls navigation information.The simulation results show that this method can suppress the influence of azimuth deviation on navigation,control the clock error of satellite,and provide higher navigation estimation accuracy.