Design Of Optical Path Control System For Ground Imaging Of High-speed Flying Projectile

With the development trend of informatization and intelligence in modern warfare,more and more attention has been paid to the demand for precision strikes in complex battlefield environments.Imaging ground targets on high-speed flying projectiles is an important development direction for target detection and identification in the future,but it is also difficult.For high-definition imaging of ground targets.When the camera on the bomb is fixed,the target needs to be locked in time by adjusting the optical path during imaging;in order to perform high-definition imaging of the ground target.The task of this subject is to design a mirror and its control system for target imaging,which can quickly adjust the optical path according to the projectile flight attitude to track and stabilize the target in real time.In this paper,according to the characteristics of the missile space structure,the number of reflectors and the structure layout of the reflector in the optical path compensation are determined.The optical path is adjusted by the double plane mirror optical system,and the rotating plane mirror adopts the fast mirror.Considering the missile flight height,flight speed and missile attitude,the image motion compensation formula during missile flight is derived.The two-stage control scheme is used to stabilize the optical path.The first stage control system is used to suppress the interference caused by the missile during flight,and the second stage control system mainly controls the movement of the fast mirror.In view of the disturbance encountered by the rapid reflector in the missile flight,the disturbance rejection effects of disturbance observer PID control and adaptive robust control in the first-order optical path stability control are compared and analyzed.The main components of the fast mirror are analyzed.By analyzing the electromechanical model of the fast mirror controlled by the voice coil motor of the linear drive motor,the dynamic model of the damping ring of the fast mirror is determined.The disturbance caused by the projectile flight process will lead to the change of the parameters of the mirror model.Model reference adaptive control is selected to control the rotation of fast mirror.In view of the influence of the resonant peak in the theoretical transfer function of the mirror on the system,the compensation link is added to reduce the existence of the resonant peak.Reference model data are determined according to the indicator requirements.Through the simulation of the mirror model reference adaptive control system,the position output of the mirror can follow the output of the reference model.