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采用微小卫星姿态运动学、动力学方程,以磁强计/太阳敏感器为姿态敏感器进行姿态确定,研究了一种基于融合反馈的改进联邦滤波算法,提出了一种基于观测新息修改的信息分配原则。给出了由四元数描述卫星姿态的误差状态方程,并对观测矢量进行推导,获得了基于角速度的观测方程,丰富了观测模型。仿真结果表明:基于角速度观测方程的引入,增强了观测信息的利用率,进而提高了姿态确定的精度,降低了计算量,保证了可靠性。
Based on microsatellite attitude kinematics and dynamics equations, the magnetometer / sun sensor is used as attitude sensor to determine attitude. An improved federated filtering algorithm based on fusion feedback is proposed, and a modified algorithm based on the observed information is proposed Information distribution principle. The quaternion is used to describe the error state equation of the satellite attitude, and the observation vector is deduced. The observation equation based on the angular velocity is obtained and the observational model is enriched. The simulation results show that the introduction of the angular velocity observation equation enhances the utilization of the observed information, improves the accuracy of attitude determination, reduces the computational complexity and ensures the reliability.