SAR实时成像光学处理器光机系统设计  

Optical-mechanical system design of SAR real-time imaging optical processor

作　　者：赵洪强 张星祥[1] 王夺 毕国玲[1] 付天骄[1] Zhao Hongqiang;Zhang Xingxiang;Wang Duo;Bi Guoling;Fu Tianjiao(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光电工程》2022年第9期22-32,共11页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(61801455)。

摘　　要：为了进一步提高合成孔径雷达(synthetic aperture radar,SAR)面对海量回波数据的实时成像处理能力,基于4f光学结构对SAR实时成像光学处理器进行了光机系统设计和分析。首先,设计了适用于滤波算法的入瞳直径21 mm、视场角7°、焦距172 mm的傅里叶变换透镜,并对4f光学系统采取紧凑化设计。然后,利用集成优化方法优化了4f光机结构中的柔性镜座,并对整体结构进行了模块化设计和分析。分析结果表明:4f光学系统成像质量趋于衍射极限,傅里叶变换透镜的MTF在55 lp/mm处优于0.57,4f光机系统在常温1g重力工况下透镜面形RMS值小于λ/50,整体结构基频大于100 Hz。4f光学处理器整体尺寸为405 mm×145 mm×92 mm,质量约为2.94 kg,其体积、质量分别仅是同等SAR数据处理水平的斜平面光学处理器的30%、48%。通过数据的模拟仿真,表明系统设计满足星载或机载的实时成像使用需求。In order to further improve the real-time imaging processing ability of synthetic aperture radar(SAR)in the face of massive echo data,the optical and mechanical system of SAR real-time imaging optical processor is designed and analyzed based on 4f optical structure.Firstly,a Fourier transform lens with an entrance pupil diameter of 21 mm,a field angle of 7°,and a focal length of 172 mm is designed for the filtering algorithm,and a compact design is adopted for the 4f optical system.Then,the flexible mirror base in 4f optical mechanical structure is optimized by using the integrated optimization method,and the overall structure is modularized designed and analyzed.The results show that the imaging quality of 4f optical system tends to the diffraction limit,and the MTF of Fourier transform lens is better than 0.57 at 55 lp/mm.The RMS value of lens surface shape of 4f optical mechanical system under normal temperature 1g gravity condition is less thanλ/50.The fundamental frequency of the overall structure is greater than 100 Hz.The overall size of 4f optical processor is 405 mm×145 mm×92 mm,the mass is about 2.94 kg,and its volume and mass are only 30%and 48%of those of oblique plane optical processors with the same SAR data processing level.Through data simulation,it shows that the system design meets the needs of real-time imaging on satellite or airborne.

关 键 词：合成孔径雷达 实时成像处理 紧凑化设计 模块化设计 

分 类 号：TN911[电子电信—通信与信息系统] TH745[电子电信—信息与通信工程]