基于星光角距/激光测距的卫星组合导航方法

为了进一步提高卫星天文自主导航精度，提出了一种利用激光测距辅助的天文组合导航方法。激光测距能够直接获取卫星到地面参考信标的高精度距离信息，在以星光角距为观测量的天文导航系统中引入激光测距辅助数据，可以拓展滤波器观测量的维度，从而改善滤波效果。由于组合导航系统为非线性系统，为避免泰勒展开线性化引起的二阶截断误差，采用UKF滤波方法进行组合导航系统信息融合。仿真结果表明，所提出的组合导航方法能够明显提升导航精度，改善滤波性能。

Satellite integrated navigation method based on starlight angular distance/laser ranging

In order to improve the accuracy of satellite autonomous celestial navigation, an integrated navigation method combining celestial navigation with laser ranging was proposed.Laser ranging can directly obtain the high precision distance information from satellite to ground reference beacon.The usage of laser ranging auxiliary data in astronomical navigation system with star angular distance as observation measurement can expand the dimension of filter observation and improve the filtering effect.Since the integrated navigation system is a nonlinear system, in order to avoid the second-order truncation error caused by the linearization of Taylor expansion, the UKF filtering method was used for the information fusion of integrated navigation system.Simulation results show that the proposed integrated navigation method can significantly improve the navigation accuracy and filter performance.