快速反射镜传感器故障检测

Sensor Fault Detection of a Fast Steering Mirror

为提高快速反射镜系统(FSM)的可靠性,本文设计实现了基于观测器的故障检测。首先,建立FSM的动力学模型,得到以状态空间方程表示的FSM系统。接着,基于状态空间方程建立故障检测观测器,通过比较系统传感器测量值和观测器所表示的相应变量信息,生成残差。最后,设计相应的残差评价函数,并将其与阈值函数比较给出传感器故障与否的信息。实验结果表明,在无需额外硬件的条件下,残差向量能够及时正确指示各传感器故障信息。

In order to improve the reliability of a two-axis Fast Steering Mirror（FSM） system with minimum hardware consumption, a fault detection method based on observer was developed. The dynamics model of the two-axis FSM was established firstly, and then the state-space form of the FSM was adopted. An observer for fault detection was designed based on the state-space form. Then the residual vector could be generated by comparing the output of the system with its estimation provided by the observer. Finally, the residual evaluation function was adopted, and a fault can be detected by comparing the residual evaluation function with a threshold. Experimental studies on a prototype system show that the sensor fault signal can be detected by the residual vectors timely and accurately. Meanwhile, the consumption of the hardware and space is decreased.