小视场星敏感器量测延时滤波算法

针对小视场（NFOV）星敏感器用于姿态估计时存在的量测延时情况，提出了一种用于解决量测延时的鲁棒扩展卡尔曼滤波（REKF）算法。根据最小方差准则的思想求解各方差的最小上界，通过最小上界确定滤波增益，设计的REKF算法可以有效解决量测延时问题，提高了姿态估计的精度。对REKF算法进行了仿真验证，结果表明:该算法优于常规加性扩展卡尔曼滤波（AEKF）算法、鲁棒有界时域滤波（RFHF）算法及鲁棒卡尔曼滤波（RKF）算法，能较好解决非线性系统存在的量测延时问题，验证了该算法的有效性。 

Filtering algorithm of NFOV star sensor measurement delay

Aimed at measurement delay in the narrow field of view (NFOV) star sensor used for attitude estimation, a robust extended Kalman filter (REKF) algorithm is proposed to solve the measurement delay. According to the minimum mean square error criterion, the minimum upper bound of the variance is solved and the filter gain is determined by the minimum upper bound. The designed REKF algorithm can effectively solve the problem of measurement delay and improve the accuracy of attitude estimation. Finally, the simulation results show that the algorithm is superior to the conventional additive robust extended Kalman filter (AEKF), robust finite-horizon filter (RFHF) and robust Kalman filter (RKF) algorithm, which can better solve the problem of measurement delay in nonlinear systems, and the effectiveness of the algorithm is verified.