机载平台下基于模型预测的双液晶偏振光栅控制技术  

Control Technology of Dual Liquid Crystal Polarization Gratings Based on Model Prediction Under Airborne Platform

作　　者：易鑫庆 刘洋[1,2] 滕云杰 刘建华[2] 王俊尧 张季丰 Yi Xinqing;Liu Yang;Teng Yunjie;Liu Jianhua;Wang Junyao;Zhang Jifeng(Institute of Space Optoelectronics Technology,School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;National and Local Joint Engineering Research Center for Space Optoelectronic Technology,School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院空间光电技术研究所,吉林长春130022 [2]长春理工大学光电工程学院空间光电技术国家地方联合工程研究中心,吉林长春130022

出　　处：《光学学报》2024年第20期28-34,共7页Acta Optica Sinica

基　　金：第八届青年人才托举工程(2022QNRC001)。

摘　　要：为了满足新一代机载光电跟瞄平台轻小型化设计要求,实现动平台下对目标高精度跟踪,提出机载平台下基于双液晶偏振光栅光电跟瞄平台的控制方法。首先,建立双液晶偏振光栅光束解算模型,根据目标位置信息确定两片光栅所需执行的位置信息;然后,将解算模型与模型预测控制算法相结合,设计伺服系统控制器,控制双光栅实现光束偏折与目标跟踪;最后,搭建实验平台进行验证,在2°@0.5 Hz与5°@0.2 Hz载体扰动情况下,动态跟踪精度分别达到132.56μrad与126.69μrad,相较于传统控制器得到较大提升,为双液晶偏振光栅光电跟瞄平台在机载平台下的应用提供理论支持与技术参考。Objective The photoelectric load system under the airborne platform is the basis of aerial photography,aerial mapping,and aerial communication in China.With the diversified application scenarios,the new photoelectric tracking platform characterized by small volume and shape,hidden and flexible installation mode,and high tracking accuracy is more suitable for applications in the new generation of aviation field than the traditional photoelectric platform.Therefore,a photoelectric tracking platform based on dual liquid crystal polarization gratings(LCPGs)is proposed to meet the above application requirements.Meanwhile,the control method is studied to provide theoretical support and technical references for the new tracking system under the airborne platform.Methods First,the dualLCPG beam solution model is built with the location information of the target location information.The solution model is divided into the forward model and the reverse model.Forward model solution analysis is the premise and foundation for the application of rotating dualgrating beam pointing.The reverse model is a key one that must be addressed in optical tracking and targetdirected applications.To achieve highprecision target tracking of dualLCPC photoelectric follow aim systems,we design a controller combining the solution model and MPC based on the beam solution model.Meanwhile,by employing the servo system controller of dualgrating control,beam deflection,and target tracking,MPC can predict the system model in the future for a certain time to improve the tracking accuracy.Finally,to verify the tracking performance of the system,we build the platform as shown in Fig.4 for dynamic tracking experiments.Employing dualgrating diffraction characteristics,we place the two gratings in parallel by the servo motor,with the encoder displaying the angle position information of the motor as the feedback signal of the control system.After the incident beam diffraction,the deflection angle is derived from the positive and negative solution calculatio

关 键 词：双液晶偏振光栅 解算模型 伺服控制 模型预测 跟踪精度 

分 类 号：O436[机械工程—光学工程]