In order to improve the anti-interference and tracking performance of photoelectric stabilized platform, a sliding mode controller based on reaching law was designed. Since the differential signal of the input was used in the sliding mode controller, if the noise was added in the input signal, its differential signal will amplify the noise, thus affecting the actual effect of the controller. To solve this problem, a method combining nonlinear Tracking Differentiator (TD) with sliding mode controller was proposed ,then the experimental system was built, and the results of the new controller and the traditional PID controller were compared. It is proved that the method this article presented can improve the anti-interference performance of the system by 66.7%, and also can increase the track precision of the input signal by 48.2%.
The PID controller is widely used in two-axis photoelectric platform velocity loop, however the control precision and the stability of controller are contradictory, especially when friction torque is added. In order to solve this problem, the characteristics of PID controller were analyzed detail in this paper, then a sliding mode controller was designed based on the approach law. First, the model of two-axis photoelectric platform velocity loop was established, then the friction model was linearized according to the interval analysis theory, after that the sliding mode function and the controller was designed, next the simulation model was build, finally, the performance of the velocity loop was compared between sliding mode controller and PID controller, the results showed the sliding mode controller has higher control precision and the stability.
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