Research On The Control System Of The Fast Steering Mirror For Aerial Camera

In recent years,aerial camera as an important means of obtaining information on the ground has been widely used in military and civilian fields.When aerial cameras take photos in the air,the camera will not only be subject to the interference of the camera itself,but also by the aircraft movement and vibration interference.Image motion is inevitable when aerial camera is operating in the air.In order to eliminate image motion,this dissertation adopts the method of optical image motion compensation.The direction of incident light is changed by controlling the deflection of the mirror of the fast steering mirror.Thus,in the exposure time,the focal plane of the camera has been imaged to the same target on the ground.This paper mainly research from the following aspects:1.In this dissertation,the status quo of the domestic and foreign status of the aerial camera,the fast steering mirror and its control methods are investigated.Based on the brief introduction of the composition and working principle of the fast steering mirror,the selection of the main components and the mathematical model of the fast steering mirror are determined.2.The control system of the fast steering mirror is designed according to the performance index of the system.The fast steering mirror is a velocity following system in the positive scan and the position following system in the reverse scan.Therefore,the fast steering mirror control system is designed to be the classic double closed loop control.3.In view of the fact that the classical control algorithm can't adapt to the time-varying parameters and the uncertainty of the model.This dissertation studies the fast steering mirror's control technology.The basic principles of PID control and fuzzy adaptive PID control are briefly described.Since the fuzzy adaptive PID controller does not depend on the accurate mathematical model and has better anti-interference performance,the fuzzy adaptive PID controller is used to adjust the PID parameters of the system position loop.4.The control precision of the control system of the fast steering mirror depends not only on the parameters of the controller,but also on the performance of the system.Therefore,according to the parameters and the performance index of the fast steering mirror,the hardware PCB board of the fast steering mirror control system is designed and the software program is debugged.5.In order to verify the system performance of the fast steering mirror control system,the simulation is verified by Matlab,and then the hardware experiment platform is built to experiment.The experimental results show that the fuzzy adaptive PID algorithm can improve the dynamic performance of the fast steering mirror control system.