陆地生态系统碳监测卫星多波束激光雷达光学系统设计  

Optical Design Used in Multi-beam LiDAR for Monitoring of TECIS

作　　者：汤天瑾[1] 杨居奎[1] 伏瑞敏[1] 孙立[1] 孙欣[1] 王玉诏[1] 宋志清[1] TANG Tianjin;YANG Jukui;FU Ruimin;SUN Li;SUN Xin;WANG Yuzhao;SONG Zhiqing(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2022年第6期36-49,共14页Spacecraft Recovery & Remote Sensing

基　　金：国家重大科技专项工程。

摘　　要：为了最大限度地发挥大口径的优势,多波束激光雷达与高分辨率相机共孔径设计已成为激光雷达的发展趋势。文章基于陆地生态系统碳监测卫星的需求,分析了大口径共孔径成像系统的特点和设计要点,给出了一种米级口径大视场的可见光多光谱相机与多波束激光接收、高倍率压缩大气探测三通道共孔径成像光学系统的设计思路和设计结果。光学系统焦距8000mm/2667mm,大气探测实现40倍压缩并与后续的法布里-珀罗标准具衔接,光学系统结构紧凑,多光谱谱段在其耐奎斯特频率处的像质、大气平行光出射波前差、多波束激光能量集中度达到衍射极限。共用三镜调焦可以有效保证各通道像质均达到衍射极限,对于大气通道尤为有利。该设计方案不仅适用于多波束激光雷达多功能共孔径光学系统,也可用于其它大口径多通道共孔径光学系统中。To exert the maximum benefit of large-diameter, common-aperture optical design of multi-beam LiDAR and high resolution camera has become a trend. Based on the request of monitoring satellite of carbon dioxideterrestrial biosphere, design key points and characteristics of common-aperture optics with large-aperture are analysed in this paper, optical design ideas and results for the three-channel common-aperture imaging system is given, which can realize high-resolution imaging, multi-beam laser reception and atmospheric detection with high rate compression. The optical system has the focal length of 8 000mm and 2 667mm, the compression rate is 40 for atmospheric detection, the parallel light will join to the Fabry-Perot Etalons. The optical system has the advantages of compact structure, diffraction limit for high resolution multispectral imaging, high-quality parallel light, diffraction encircled energy limit for multi-beam laser detection. The shared third mirror works as the shared focusing system, which can ensure the optimum quality for three channels especially the atmospheric detection with a fixed field diaphragm on the position of its secondary image. The optics proposed in this paper is not only suitable for the common-aperture optical system of multi-beam LiDAR, but also fit for other optics with large common aperture.

关 键 词：多波束 激光雷达 共孔径 大口径 能量集中度 陆地生态系统碳监测卫星 航天遥感 

分 类 号：O439[机械工程—光学工程]