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针对基于磁强计测量的微小卫星,提出了基于串并联混合策略的轨道姿态耦合确定方法。滤波初期,考虑到估计误差较大,采用先地磁场大小测量的轨道确定、后地磁场矢量测量的姿态确定的串联策略;稳定后,采用基于矢量测量的轨道、姿态同步确定的并联策略。为降低轨道、姿态确定的相互影响,设计了基于信息的鲁棒Kalman滤波,通过自动调节增益矩阵处理两个滤波系统间的影响。仿真表明,该方法在提高鲁棒性的同时,还能适当提高状态估计的精度。
Aiming at the micro satellites based on magnetometer, a method to determine orbit attitude coupling based on series-parallel hybrid strategy is proposed. In the initial stage of filtering, considering the large estimation error, the tandem strategy of determining the orbit of the ground magnetic field measurement and the attitude determination of the post-earth magnetic field vector measurement is adopted. After the stabilization, the parallel strategy of the orbit and the attitude synchronization determined by the vector measurement is adopted. In order to reduce the mutual influence of trajectory and attitude determination, a robust information-based Kalman filter is designed to deal with the influence of two filtering systems by automatically adjusting the gain matrix. Simulation results show that the proposed method can improve the robustness of state estimation and improve the accuracy of state estimation.