基于共形衍射光学系统的合成孔径激光雷达成像探测  

Synthetic Aperture Lidar Imaging Detection Based on Conformal Diffractive Optical System

作　　者：李道京[1] 胡烜[1,2] 周凯 姚园[3] 乔明 Li Daojing;Hu Xuan;Zhou Kai;Yao Yuan;Qiao Ming(State Key Laboratory of Science and Technology on Microwave Imaging,Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Airborne Optical Imaging and Measurement,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China)

机构地区：[1]中国科学院电子学研究所微波成像技术国家级重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]中国科学院长春光学精密机械与物理研究所航空光学成像与测量重点实验室,吉林长春130033

出　　处：《光学学报》2020年第4期173-186,共14页Acta Optica Sinica

基　　金：高分专项资助课题(GF0314)。

摘　　要：合成孔径激光雷达(SAL)可在大前斜视角条件下以较小的光学孔径,对远距离目标进行高分辨率、高数据率成像,是光学成像探测的一种重要形式。对口径为100mm、作用距离为20km、分辨率为0.05m的SAL的工作模式、系统方案、指标参数和关键技术进行分析,并提出与设备整流罩共形的衍射光学系统概念,有利于减少气动影响和设备的体积、质量。借助微波相控阵天线模型,研究基于频率扫描变化的激光波束展宽和一维波束扫描方法,给出相关波束方向图的仿真结果。结果表明,基于曲面共形衍射光学系统的SAL成像探测技术具有可行性。Synthetic aperture lidar(SAL)can obtain high-resolution and high-data-rate images for remote target with small optical aperture under large forward squint angle condition.Thus,SAL can be an important mode of optic imaging detection.In this study,the working mode,system scheme,performance parameters,and key technologies of SAL with 100 mm diameter,20 km detection range,and 0.05 mresolution are analyzed.A concept of a diffractive optical system conforming to the dome is proposed to reduce the aerodynamic influence and volume and weight of the equipment.The laser beam broadening and one-dimensional beam scanning method based on frequency scanning change is studied,and the beam pattern simulation results are presented by using the model of microwave phased array antenna.The results show that the SAL imaging detection technology based on curvedconformal diffractive optical system is feasible.

关 键 词：遥感 衍射光学系统 合成孔径成像 激光雷达 激光波束扫描 

分 类 号：TN958.98[电子电信—信号与信息处理]