| With the development of the Precision Guided Weapon technique, airborne electro-optical pod has became an important part of fighter precise attack system. It is used to isolate antenna pointing from the vehicle's varying attitude and dynamical vibration and research, localize and trace targets with electro-optical sensors. It is very important for the national defense construction of our country to develop airborne electro-optical pod.This paper mainly focuses on study of airborne electro-optical pod, and builds the mathematic model of the pod. The pod includes two axe servo systems: Az, El, which consist of speed and position loops. The standard of pod controller design is relatively high, because the airborne electro-optical pod is a system which has the great delay, nonlinear and requirement of high-precision tracking. The design based on variable Structure Control (VSC) theory is proposed in this paper, compared with current popular control methods. The controller is designed with the method which is VSC with proportional law for the speed and position loops. The emulation by Matlab indicates that the system performance is improved effectively compared with classic PID controller, and the stabilization precision and response speed meet the requirements of the system design.The VSC is designed by exponential velocity trending law and applied into position loop of every loop, because the exponential velocity trending law would bring about vibration severely. The emulation shows that the system vibration can be decreased effectively. According to the practical engineering, the paper propose the practical algorithm of the VSC with exponential velocity trending law. |
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