Research on two-degree-of-freedom antidisturbance servo control for electromagnetic fast steering mirror

To improve the control bandwidth, precision, and anti-interference capability of electromagnetic fast steering mirrors (FSM), a two-degree-of-freedom electromagnetic FSM control system based on active disturbance rejection control (ADRC) is proposed. The control system adopts a feedback-based two-degree-of-freedom algorithm with ADRC, adding a derivative term filter and an active disturbance rejection controller to the traditional PID control algorithm, enabling simultaneous response to setpoint changes and system disturbances. A corresponding simulation system was established for controller debugging. The control parameters obtained from simulation were applied to the actual hardware platform. Test results show that the two-degree-of-freedom electromagnetic FSM control system based on ADRC further improved the system's dynamic and steady-state performance, increasing the FSM bandwidth to 900Hz@-3dB. When applied to laser terminal tracking systems, the tracking accuracy was better than 5μrad (3σ), effectively improving system precision and anti-interference capability.