摘要
当星载惯性基准单元 (IMU)正常工作的陀螺的冗余度不满足奇偶方程法条件时 ,无法进行陀螺的故障诊断。本文通过卫星稳态运行期间高精度星敏感器输出的姿态四元数信息 ,根据卫星姿态运动学方程和姿态动力学方程 ,采用非线性广义卡尔曼滤波 (EKF)得到星体角速度的估计值。在此基础上 ,通过设计的故障诊断方案对陀螺故障进行定位。
When the redundance of the gyroscopes in IMU can not meet the condition of odd-even equation,fault diagnos is can not be realized. In this paper, by using the attitude quaternion from sta r sensor, we acquired the estimated angular rate by EKF, and the n used the diagnosis scheme to diagnose and locate fault. The simulation results testified that this method can diagnose both the hard fault and the soft fault of gyroscopes.<
出处
《航天控制》
CSCD
北大核心
2004年第3期93-96,共4页
Aerospace Control
关键词
陀螺
故障诊断
星敏感器
卡尔曼滤波
Gyroscope Fault diagnosis Star sensor Kalman filtering