空间相机内方位元素热稳定性集成分析与试验  

Integrated Analysis and Experiment on Thermal Stability of Spaceborne Cameras’Internal Orientation Elements

作　　者：薛志鹏 刘金全 张雷 丛杉珊 刘畅 王佳宁 陈顺发 Xue Zhipeng;Liu Jinquan;Zhang Lei;Cong Shanshan;Liu Chang;Wang Jianing;Chen Shunfa(Chang Guang Satellite Technology Co.,Ltd.,Changchun 130000,Jilin,China)

机构地区：[1]长光卫星技术股份有限公司,吉林长春130000

出　　处：《光学学报》2024年第18期399-404,共6页Acta Optica Sinica

基　　金：吉林省重点研发项目(20220201029GX);中国博士后科学基金(2022M710487)。

摘　　要：针对空间相机内方位元素热稳定性的评估需求,提出空间相机内方位元素光机热集成分析方法与试验技术。首先,基于反射镜刚体位移所引起的相机内方位元素变化原理,建立刚体位移与内方位元素的数学模型;然后,通过光机热集成仿真分析方法开展空间相机的热弹性分析,提取弹性变形下的刚体位移,并根据所建立的数学模型计算出相机温度变化引起的内方位元素变化量;最后,针对空间相机温度-内方位标定测试需求,搭建试验平台,并对不同相机温度下的内方位进行标定。试验结果表明:相机在不同温度下的内方位元素仿真与试验结果误差在0.1 pixel以内,从而验证所提出的内方位元素集成分析方法与试验技术。相机在3℃温差下内方位元素变化小于0.3 pixel,进一步论证相机具有良好的稳定性。Objective The internal orientation elements of a spaceborne camera are a key factor affecting the remote sensing accuracy,and precise calibration is required before the launch into orbit.During the imaging of a spaceborne camera in orbit,due to disturbances such as satellite temperature changes,deformation of optomechanical structures such as mirrors can occur to result in changes in internal orientation elements.However,there is currently little research on the analysis and testing techniques for on-orbit changes of orientation elements within spaceborne cameras.The optomechanical integration simulation technology has been widely applied to the performance analysis of spaceborne cameras,and some scholars have already applied it to the stability analysis of internal elements in cameras.Meanwhile,there is no research on the variation of internal orientation elements caused by temperature changes in camera calibration on the ground.Therefore,we study the change mechanism of internal orientation elements caused by optical component deformation,and provide optomechanical integration analysis and ground testing methods for evaluating the stability of internal orientation elements in orbit.Additionally,the accuracy of the proposed method by comparing simulation and experimental results is further demonstrated.Methods We propose a method for evaluating the stability of spaceborne cameras’interior orientation elements,which includes integrated analysis and experiments.The finite element method is often adopted for thermal elastic analysis of optomechanical systems.The deformation of the finite element node after thermal elastic deformation will include both rigid displacement of the optical element and surface high-order deformation.The high-order deformation affects the surface shape accuracy of the mirror,while the rigid displacement will affect the line of sight.Firstly,based on the principle of the changes in the cameras’internal orientation elements caused by the rigid body displacement of the mirrors,a mathemat

关 键 词：传感器 空间相机 内方位元素 稳定性 集成分析 

分 类 号：O436[机械工程—光学工程]