基于平方根UKF的双星编队相对状态自主确定

基于AFF技术,提出了一种利用类GPS敏感器进行星间测量的双星编队相对状态自主确定算法。该算法以双星编队相对轨道和相对姿态运动方程为状态方程;为消除系统误差和钟差的影响,用同一卫星不同接收天线之间的伪距观测值的单差来构造测量方程;为保证协方差阵的正定性,提高计算精度和速度,应用平方根UKF滤波方法进行双星编队相对状态的自主确定。仿真结果验证了所给出方法的可行性和有效性。

Relative states autonomous determination of double satellites formation based on square root UKF filter

The autonomous determination of relative states is a key technique of formation flying.Based on AFF technology,a relative states autonomous determination algorithm based on intersatellite measurement by GPS-like sensors is put forward.Relative orbit and attitude motion equation of double formation satellites are taken as states equation.In order to eliminate the influence of system error and time error,the measurement equation is formed by single difference between different receiving antennas of the same satellite.To guarantee positive definite quality of covariance and to improve calculation precision and speed,a square root UKF filter is used to realize relative states autonomous determination of double satellites formation flying.Simulation results show the feasibility and effectiveness of the proposed algorithm.