机载雷达天线伺服控制扰动观测器建模仿真

Modeling and Simulation of Airborne Radar Antenna Servo Control with Disturbance Observer

机载雷达天线伺服控制的精度是雷达系统精确搜索、识别和探测目标的重要指标之一。由于风速和载体运动速度的影响,雷达天线做扫描运动时会承受较大的空气阻力,空气阻力随着时间和扫描运动角度的变化而变化,使雷达天线伺服控制产生附加负载扰动转矩。为了尽可能减小扰动对雷达伺服控制精度的影响,本文提出一种基于扰动观测器的雷达天线伺服控制解决方案。建立雷达天线伺服控制系统的动力学模型、伺服控制模型,将空气阻力产生的附加转矩通过扰动观测器引入被控对象的控制输入端进行补偿,并对不同风速影响进行建模仿真和试验分析。结果表明:基于扰动观测器的雷达天线伺服控制精度有显著提高。

Accuracy of airborne radar antenna servo control(ARASC)is one of important index for radar system to accurately search,identify and detect targets.Radar antenna bears greater air resistance during scanning motion,because of the wind speed and moving speed of the carrier.As the atmosphere resistance is changed along with time and different scan movement angle,it will bring additional load disturbance torque for ARASC.In order to control the influence of disturbance on accuracy of ARASC,which based on disturbance observer(DOB),a solving scheme is put forward in this paper.ARASC dynamic model and servo control model are established,additional load torque generated by atmosphere resistance is import to input of controlled object for putting up compensate to improving accuracy in practical environment.Modeling simulation and experimentation analysis are put up with different wind speed influence,simulation experimentation show accuracy of ARASC based on disturbance observer is improved obviously.