基于准滑动模态的雷达伺服系统控制

Radar servo system control based on quasi-sliding mode

为了改善某跟踪雷达伺服系统的性能,以无刷直流电机(BLDCM)作为天线伺服驱动,在无刷直流电机模型的基础上,设计了雷达伺服系统的三闭环控制系统,电流环和速度环均采用PI控制,位置环采用准滑模控制。给出了电流环和速度环的开环频率特性,并绘出了伺服系统位置环的阶跃响应曲线和正弦信号跟踪曲线。结果表明,所设计的伺服系统电流回路和速度回路稳定,能够达到性能要求;位置环响应速度有所提高,对系统参数的不确定性及干扰有很强的鲁棒性,雷达伺服系统的跟踪速度、跟踪精度、稳定性都有所改善。

In order to improve the properties of servo system for a tracking radar,the brushless DC motor（BLDCM） was used to the antenna’s driving.Based on the model of BLDCM,three closed loop control system of radar servo system was designed.PI regulator was adopted in the speed closed-loop and the current closed-loop,and quasi-sliding mode control was used in the position loop.The open-loop frequency transfer functions of the speed closed-loop and the current closed-loop were given,and curves of step response and sinusoidal trajectory tracking were drawn for the position loop.The results show that： the speed closed-loop and the current closed-loop are stable,which can meet the performance requirements;the response speed for position loop is improved,the system has good robustness on the system’s parameter changing and disturbance,and the tracking speed,the tracking accuracy and the stability of radar servo system are improved.