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针对使用两个星敏感器进行姿态测量的三轴稳定控制系统,利用星敏感器输出值与陀螺输出值的解析冗余关系,通过设计两个滤波器实现对不同星敏感器的故障隔离.考虑到陀螺测量噪声以乘性噪声的形式出现在姿态运动学方程中,利用陀螺输出测量值和目标星敏感器的测量值,采用线性最小均方差估计器得到包含目标星敏感器故障信息的残差;以无故障情况下残差的统计方差为基础得到阈值,通过检验残差评价值是否超过相应的阈值,实现对目标星敏感器故障的检测;分别将两个星敏感器作为目标星敏感器,综合两个故障检测结果隔离故障.对星敏感器出现测量偏差和精度逐渐下降两种故障的仿真验证了该方法的有效性.
Aiming at the three-axis stability control system using two star sensors for attitude measurement, the paper analyzes the redundant relationship between the output value of the star sensor and the gyro output value and designs two filters to realize the fault isolation of different star sensors. To the gyro measurement noise appears in the form of multiplicative noise in the kinematics equation of attitude, the gyro output measurement and the target star sensor measurements, the use of linear minimum mean square error estimator contains the target star sensor fault information of the residual ; The threshold is obtained based on the statistical variance of the residual error in the case of no fault, and the detection of the target star sensor failure is achieved by checking whether the residual evaluation value exceeds the corresponding threshold; and two star sensors are respectively regarded as the target star sensor , The two fault detection results are integrated to isolate the fault.The simulation of the two kinds of faults, such as the deviation of the measurement and the decrease of the accuracy of the star sensor, proves the effectiveness of the method.