新型SAR实时成像光学系统设计  

New SAR real-time imaging optical system design

作　　者：蔡志鹏 张星祥[1] 陈哲[1] 毕国玲[1] 王洪钧 CAI Zhi-peng;ZHANG Xing-xiang;CHEN Zhe;BI Guo-ling;WANG Hong-jun(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, 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

出　　处：《液晶与显示》2020年第11期1185-1194,共10页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61801455)。

摘　　要：为了实现对合成孔径雷达(Synthetic Aperture Radar,SAR)数据实时成像处理的目的,在利用空间光调制器(SLM)的基础上,设计了SAR数据实时成像斜平面光学处理器,并调整光路,在保证像质的情况下减少系统所占体积。首先,利用SLM代替传统斜平面处理器中的胶片,提高SAR数据光电转换的速率。然后,根据已知的SAR相关数据设置光学处理器的结构参数。根据SAR的横纵缩尺比设计满足要求放大率的柱透镜,根据柱透镜的总体长度设计球面镜,以保证柱透镜有足够的工作空间,球面镜部分设计为4组元全对称结构形式。设计完成后,再调整光路以减少系统所占体积,紧凑轻便以便于星载或机载使用。设计结果表明,系统MTF在截止频率内均大于0.4,满足成像要求。光路优化调整后,由总长1400 mm左右变为700 mm左右,满足设计要求和实际使用要求。In order to achieve the purpose of real-time imaging processing of synthetic aperture radar(SAR)data,based on the use of spatial light modulator(SLM),a SAR data real-time imaging oblique plane optical processor is designed,and the optical path is adjusted to ensure image quality and reduce the volume occupied by the system.First,SLM is used to replace the film in the traditional oblique plane processor to reduce the photoelectric conversion rate of SAR data.Then,the structural parameters of the optical processor are set according to the known SAR related data.According to the horizontal and vertical reduction ratio of SAR,a cylindrical lens that meet the required magnification is designed,and a spherical lens is designed according to the overall length of the cylindrical lens to ensure that the cylindrical lens has sufficient working space.After the design is completed,the optical path is adjusted to reduce the volume occupied by the system,which is compact and lightweight for easy use on spaceborne or on board.The design results show that the system MTF is greater than 0.4 in the cut-off frequency,which meets the imaging requirements.After the optical path is optimized and adjusted,the total length is changed from 1400 mm to about 700 mm.The results meet the design requirements and actual use requirements.

关 键 词：合成孔径雷达 光学处理器 实时成像 紧凑型结构 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]