动中通多子阵天线自适应PID滑模稳定控制

Stabilization Control for SOTM Antenna Based on Adaptive PID Sliding Mode

动中通在载体运动中进行卫星通信时,天线受到各类扰动的影响而不能准确对准卫星,降低了通信质量。为了解决此问题,设计了一种自适应滑模天线姿态稳定控制器。首先建立了动中通天线系统的动力学模型;基于此模型,采用PID滑模面设计了天线的滑模姿态控制器;通过对扰动的自适应估计,在扰动上界未知情况下获得了平滑的滑模控制输入;将PID方法引入控制器设计,提高了系统的动态响应速度。仿真结果表明,所设计控制器具有良好的动态响应特性和控制精度,且控制电压输出无抖振。

During the satellite communication process, the attitude of Satcom On-The-Move （SOTM） antenna is seriously affected by disturbances with unknown bound, which may cause degradation of communication. In order to enhance the antenna performance, an adaptive sliding mode stabilization controller for SOTM antenna attitude was proposed. First, a dynamical model of SOTM antenna system was established. Then, an antenna attitude controller was designed based on the PID sliding mode surface. The adaptive estimator of disturbances was introduced into the controller to overcome the chattering of control outputs, and the PID method was also adopted to improve the dynamical characters of the control system. Simulation results show that, the proposed controller has fine performances on both the dynamical responses and control accuracy, and the control voltage is obtained smoothly.