基于磁强计测量的微小卫星轨道姿态 耦合确定方法

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。

Orbit and Attitude Coupled Determination of Small Satellite Based on Magnetometer

A coupled method is designed for orbit and attitude determination of small satellite, which only relies on magnetometer measurement. Considering the big estimation errors before filter converging, the earth magnetic field magnitude is used to estimate orbit, and the earth magnetic field vector is used to estimate attitude after the orbit filter has converged. When both orbit and attitude filters converge, they are synchronously determined both using vector measurement. To reduce the influence between the two filters, a robust Kalman filter is designed based on innovation. Simulation results indicate that the method in this paper can improve estimation accuracy and enhance robustness of this system.