考虑钟差修正的脉冲星与多普勒差分组合导航

为了提高导航系统长时间航行的导航精度和钟差修正能力, 提出了一种钟差修正的X射线脉冲星与多普勒差分组合导航方法.X射线脉冲星导航(X-ray pulsar navigation, XPNAV)使用脉冲到达时间作为导航量测量, 多普勒差分导航测量两个时刻航天器相对于太阳的多普勒速度, 并将两个多普勒速度的差值作为导航的量测量, 这里采用两个多普勒速度的差值可避免多普勒速度偏差; 在此基础上, 将星载时钟钟差增广为新的状态变量, 建立组合导航系统, 使用联邦无迹卡尔曼滤波器(unscented Kalman filter, UKF)融合导航信息.仿真结果表明, 该方法可以抑制多普勒速度偏差对导航的影响, 控制星载时钟钟差, 并提供更高的导航估计精度.

Pulsar and Doppler difference integrated navigation considering clock error control

In order to ensure the navigation accuracy of long time navigation systemand and improve the ability of clock error control,X-ray pulsar and Doppler difference integrated navigation method for correction of clock difference is proposed.X-ray pulsar navigation is measured by pulse arrival time,Doppler differential navigation utilizes the difference between the two moment Doppler velocities relative to the sun.The difference between the two Doppler velocities not including Doppler speed deviation can be used as navigation measurement information.The onboard clock error is augmented into the new state variable,the integrated navigation system is established,and the federated unscented Kalman filter(UKF) is used to fuse the navigation information.The simulation results show that the method can suppress the influence of Doppler velocity deviation on navigation,control the clock difference on the onboard clock,and provide higher navigation estimation accuracy.