System identification and H∞ integral control of the voice actuator fast steering mirror

As one of the key devices in laser communication, the quality of the Fast Steering Mirror's model plays an important role in the control of the system. We innovatively obtained the mathematical model of the FSM using the impulse response-based Hankel matrix identification method.The identification method is effective in characterising the resonance characteristics and flexible modes of the voice coil motor itself, and has the effect of improving the accuracy of the model identification. Based on the identified mathematical model, we first introduced the H
∞
integral controller into the FSM control. Experimental results have demonstrated that the H
∞
integral controller outperforms the PID, SMC, and LQR control methods and can significantly improve the tracking and disturbance rejection capabilities of the system.