基于SDRE方法的空间飞行器轨道交会状态估计  

A State Dependent Riccati Equation Filter for Relative States Determination During Spacecraft Rendezvous and Docking

作　　者：孙平[1] 刘昆[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《飞行力学》2009年第1期51-54,共4页Flight Dynamics

摘　　要：针对空间飞行器自主交会对接的最终逼近阶段,采用雷达作为相对测量设备,建立了目标飞行器轨道坐标系下的相对运动方程以及基于星载雷达的测量模型;运用基于状态相关黎卡提方程(SDRE)的方法设计滤波器,对目标飞行器运动状态进行估计,给出了状态相关黎卡提方程的数值解法,通过具体仿真算例分析了所设计滤波器的性能,并与扩展卡尔曼滤波器进行了比较,结果表明所提出的滤波器模型具有更高的相对状态确定精度。An algorithm of determining relative states between a target and the chase vehicle during the process of rendezvous and docking was interpreted. The relative motion equations were given in the relative coordinate. Measuring model was built using the rendezvous radar as the sense. The State Dependent Riccati Equation （SDRE） Filter was applied to the estimation of relative states. Numerical methods for solving the SDRE were discussed and a simulation example was advanced. The simulation results show that the presented filter gives substantially better results than the Extended Kalman Filter （EKF）.

关 键 词：航天器交会 状态相关黎卡提方程 滤波精度 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]