基于次镜像移补偿的折反式航测相机光机系统设计  

Design of Optical-mechanical System of Catadioptric Aerial Mapping Camera Based on Secondary Mirror Image Motion Compensation

作　　者：张洪伟 曲锐[1] 陈卫宁[1] 杨洪涛[1] ZHANG Hongwei;QU Rui;CHEN Weining;YANG Hongtao(Aircraft Optical Imaging and Monitoring and Measurement Technology Laboratory,Xi′an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi′an 710119,China)

机构地区：[1]中国科学院西安光学精密机械研究所飞行器光学成像监视与测量技术研究室,西安710119

出　　处：《光子学报》2024年第2期224-231,共8页Acta Photonica Sinica

基　　金：中国科学院青年创新促进会项目(No.2023422)。

摘　　要：针对航测相机对地摆扫成像过程中的动态像移问题,采用两镜望远系统的矢量像差理论,将次镜作为像移补偿元件,通过次镜多维运动实现航测相机的综合像移补偿。次镜在对像移进行补偿的过程中会发生偏心和倾斜,导致次镜离轴,影响成像质量,因此,建立了失调折反光学系统成像模型,研究次镜像差场偏移矢量与次镜失调量之间的关系,并分析次镜多维运动对成像质量的影响。为验证次镜多维运动的像移补偿能力,搭建实验平台对该航测相机进行了实验室内以及外场成像试验。结果表明,采用该像移补偿技术的航测相机动态分辨率可达74 lp/mm,且像移补偿精度优于0.5个像素,达到设计预期。Aerial surveying and mapping is an important technical means of civil/military surveying and mapping,which can quickly obtain large-scale and high-precision scale mapping of the target area in a short period of time,and accurately obtain coordinate information of the target plane and elevation information on the map.The acquired information plays an important supporting role in digital city construction,land resources survey,military strategic planning,etc.With the development of aerial surveying and mapping technology,the requirements for aerial mapping cameras have been further improved.It is required that aerial mapping cameras can achieve wide width,high precision and large scale mapping.In order to meet the above requirements,the aerial mapping camera adopts scan imaging mode,but this imaging mechanism will introduce forward/scan image motion,which will affect the image quality.In order to satisfy the image stabilization accuracy of the aerial mapping camera,it is necessary to compensate the image motions.Therefore,a catadioptric aerial mapping camera based on secondary mirror image motion compensation is designed in this paper.Aiming at the dynamic image motion problem of the aerial mapping camera in the process of ground swing imaging,the vector aberration theory for a two-mirror telescopic systems is adopted.The secondary mirror is used as the image motion compensation element, and the comprehensive image motioncompensation of the aerial mapping camera is realized through the secondary mirror multi-dimensionalmotion. However, in the process of compensating the image motion, the secondary mirror will be eccentricand inclined, which will cause the secondary mirror to be off-axis and affect the image quality. Therefore,a misalignment optical system model is established to study the relationship between the deviation vector ofthe secondary mirror field and the misalignment of the secondary mirror field, and the influence of thesecondary mirror motion on the image quality is analyzed. Meanwhile, a design examp

关 键 词：航测相机 像移补偿技术 光机系统 次镜失调 矢量像差理论 

分 类 号：V241[航空宇航科学与技术—飞行器设计] TP73[自动化与计算机技术—检测技术与自动化装置]