基于UKF的编队卫星的相对姿态确定算法

针对编队卫星相对姿态确定问题,采用一种改进的无迹卡尔曼滤波UKF进行了系统滤波器设计,根据UKF滤波器的性质,推导出了适用于编队卫星相对姿态确定的UKF滤波算法.较之传统的EKF滤波器,UKF不仅提高了滤波精度,简化了计算过程,减少了计算量,而且更易于实现.应用四元数法描述卫星姿态,避免了欧拉角法的奇异性问题.仿真结果表明,UKF滤波器收敛速度大大高于EKF滤波器.而状态估计精度与EKF相当,方差估计优于EKF,且数值稳定性好.

An Algorithm for Determining Relative Attitude between Formation Satellites Based on UKF

In view of the problem that determination of relative attitude between formation satellites is difficult,a modified Unscented Kalman Filter(UKF)was adopted to design the Filter of system in the paper.An UKF algorithm was applied for determining relative attitude.Compared with standard Extended Kalman Filter(EKF),UKF not only can improve the precision of the filter,simplify the computation process,reduce the computation load,but also can be realized more easily.The method,which uses the quaternion to describ...