Design Of Antenna Servo Control System Of Vehicle Satellite Communication In Motion

With the coming of the information age, satellite communication is playing an increasing important role, and puts forward higher requirements to satellite communication technology.“Communication On The Move” system is a application field which is currently demand and rapid development, and has very extensive application prospect both in the field of military and civilian. In order to improve the pointing accuracy and immunity performance of the system, we must improve the control technology of the “COTM” antenna servo control system. This topic mainly designs the controller for the antenna servo control systems which are carried on vehicles.At present,the PI controller which is based on classical control theory is still widely used in the “COTM” antenna servo control system. However, because of the low order, PI controller has bottleneck for the resonance in the antenna servo control systems which are carried on vehicles. It cannot ensure both the pointing accuracy and immunity performance. In recently years, many scholars have studied the design method of state feedback based on modern control theory. This kind method studies how to achieve the optimal performance or optimal energy consumption under the given constraints based on the state space model, is more suitable for the antenna servo system with complex dynamic.This topic first combining with mechanism modeling and the Hankel identification method based on Markov coefficient to set up the mathematical model for the 0.9-meter antenna servo system and reduce the order of the model. And then design the controllers of the speed loop and position loop based on the reduced model. The controllers of the speed loop include the feed-forward controller and the controller of the gyro loop. The method based on model matching is used on the design of the feed-forward controller to improve the immunity of the system performance. On the design of the gyro loop controller, this topic first analysis the limitations of PI controller and then put forward and design the LQR output feedback scheme which bases on the internal principle to improve the tracking performance. Then introduce the optimal disturbance observer and disturbance filtering compensation to further improve the immunity performance under the system has a high precision tracking performance. After the speed loop has a high comprehensive performance, design a P controller for the position loop and simulation for the overall control performance. Make sure that the position loop has high tracking performance and immunity performance.Finally,this topic validation the designed control schemes on the 0.9 meters antenna servo system experiment platform from CETC54. The validation results show that the designed control scheme can guarantee high tracking performance and disturbance resistance, the comprehensive performance is far superior to the traditional PI controller.