中心差分Kalman滤波方法在X射线脉冲星导航中的应用

由于脉冲星脉冲到达时间的测量需要较长时间，基于传统的扩展Kalman滤波的X射线脉 冲星定轨方法精度较低。为此，提出了将中心差分Kalman滤波应用于X射线脉冲星导航中， 利用中心差分Kalman滤波替代扩展Kalman滤波，通过结合航天器轨道动力学模型和脉冲星观 测信息进行定轨。仿真结果表明，中心差分Kalman滤波方法的定轨精度高于扩展Kalman滤波 方法。

Application of Central Difference Kalman Filter Method in Navigation Based on X-ray Pulsars

Since measuring the pulse arrival time of pulsars requires long observation time,X-ray pulsars positioning based on the traditional Extended Kalman Filter(EKF) could produce large errors.For this reason,a method of X-ray pulsars positioning based on the Central Difference Kalman Filter(CDKF) is proposed.The CDKF can substitute for the EKF to blend the dynamic model of the spacecraft with the pulsar measurements for spacecraft positioning.Simulation results show that the CDKF method outperforms the EKF method.