The purposes of controlling antenna control unit to complete the movements in azimuth,pitch and line are to ensure the antenna always aiming at the satellite in time,build stable link of data transmission and achieve high quality communication.There is a pressing need to control the attitude of aircraft with a controller with strong robust stability because of complex structure and changeable working environment.For removing system buffeting come from sliding mode variable structure control with strong robustness and anti-interference ability and avoiding high frequency component of unused model in incentive system,the strategy of SMC based on modified exponential approach law is proposed.Through combined simulating adams model of antenna and simulink model of electric machinery controller and comparing different results of azimuth motor and pitch motor which are under SMC control and PI control,the conclusion is reached that SMC makes antenna control unit respond fast,increases system robustness and anti-inter-ference ability and has a better performance than PI control.%在飞机飞行过程中,通过对天线控制单元的控制,完成方位、俯仰以及直线运动,保证天线阵面能够始终实时地完成对星,以建立稳定的数据传输链路,实现高质量的通讯.由于单元本身结构的复杂性,以及工作环境的多变性,迫切要求一种能对系统参数摄动和外部扰动具有强鲁棒性的控制器来实现对飞行器姿态的控制.具有强鲁棒性和强抗干扰能力的滑模变结构控制易引起系统的抖振,为消除并避免激励系统中未用模型所表示的高频成分,提出采用变指数趋近律的滑模变结构控制策略.将天线阵面的Adams模型和电机滑模控制器的Simulink模型进行联合仿真,并比较方位电机和俯仰电机分别在滑模变结构控制和PI控制下得到的不同结果.得到结论,滑模变结构控制使精度要求高的天线伺服单元能够快速响应,提高了系统的鲁棒性以及抗干扰能力.相较于PI控制具有更好的性能.
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