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相机安装底板作为卫星和相机的接口,其微振动量级对卫星、相机都很重要。总体设计经常把相机视为刚体,忽略了相机弹性和扰振频谱的耦合,使得计算出现误差。文章将相机视为弹性体,利用有限元软件和CODEV建立了结构、光学模型,分析了安装底板1μm平动位移以及0.1″转动位移对相机像移的全谱段影响,并反推得到了相机对安装底板微振动的频域要求。结果显示,以像移不超过0.35个像元(像元大小7μm)为指标,某分辨率1m的相机的安装底板在敏感频率处的平动位移幅值不应超过0.01μm,角位移幅值不应超过0.003″,该分析可以为总体设计初期提供参考。
As the interface between the satellite and the camera, the camera mounting base has an important micro-vibration level for satellites and cameras. The overall design often considers the camera as a rigid body, neglecting the coupling of the camera’s elasticity and the disturbing spectrum, making the calculation error. In this paper, the camera is regarded as an elastic body. The structure and optical model of the camera are established by using the finite element software and CODEV. The effects of translational displacement of the mounting base plate at 1μm and the displacement of 0.1 “on the full spectrum of the camera image are analyzed. The results show that the translational displacement amplitude at the sensitive frequency of the mounting baseplate of a camera with a resolution of 1m, with an image shift of not more than 0.35 pixels (cell size of 7μm) Should not exceed 0.01μm, and the amplitude of angular displacement should not exceed 0.003 ”. This analysis can provide reference for the initial design.