Tracking control system for electromagnetic type fast steering mirror and bandwidth improving and phase lag compensation method

Abstract

The invention relates to a tracking control system for an electromagnetic type fast steering mirror and a bandwidth improving and phase lag compensation method. The control system includes an input module, a closed loop control system, a zero phase difference feedforward compensator and an output module connected with the closed loop control system in series. The closed loop control system is composed of an incompletion differential PID controller, a fast steering mirror and an SGS strain sensor. According to the control system, an inertial element is introduced into a differentiation elementin a traditional PID controller, so that unsteady influence of low order resonance of an electromagnetic type fast steering mirror mechanism is eliminated through an incomplete differential PID control algorithm and an aim of making a control bandwidth surpass resonance frequency thereof is achieved. At the same time, based on zero pole offset at the front end of the closed loop control system, the zero phase difference feedforward compensator is introduced, so that phase lag of the tracking control system is reduced. The control method provided by the invention is simple and easy to execute,high in adaptability, can improve control bandwidth of the electromagnetic type fast steering mirror effectively and achieves a good lag compensation effect, so that the tracking performance of the fast steering mirror is improved.

Description

technical field [0001] The invention relates to the field of precise tracking control, in particular to a tracking control system of an electromagnetic fast mirror and a method for improving bandwidth and compensating for phase lag. Background technique [0002] In recent years, with the rapid development of microelectronics engineering, aerospace engineering and other fields, fast reflectors have been widely used in astronomical telescopes, image stabilization control, precise pointing of spacecraft communication, and satellite imaging, and play an increasingly important role. . And with the continuous increase in the aperture of astronomical telescopes and other application systems and the continuous improvement of the control accuracy of the optical axis, on the one hand, the fast mirror is required to suppress higher frequency jitter on the premise of achieving a larger deflection angle, on the other hand, the system Expect to use a large aperture fast mirror. Compared...

AI Technical Summary

Problems solved by technology

Although these methods can basically suppress the displacement resonance of the structure, the bandwidth improvement is limited and the control effect is not good; at the same time, the phase of these systems with resonators cannot be directly phase-eliminated.

Therefore, the system still has a significant phase lag as the frequency increases, reducing its target tracking accuracy

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