航天器微振动对空间相机像质的影响

Space Camera Image Degradation Induced by Satellite Micro-vibration

采用集成模型法研究了航天器微振动对空间相机像质的影响,针对探测器CCD曝光积分时间内动态成像系统像移等价于静态像点模糊,提出动态成像评价指标,并进行了动态成像分析.介绍了空间相机受到的各种微振动干扰源,利用有限元软件建立了相机的有限元模型,并对相机进行动力学分析,获取了光学元件的微振动量,将其输入到光学软件CODE V,得到系统退化的像面点列图、调制传递函数、像移量等分析结果.这种方法适用于任何振幅、频率形式的复杂微振动,且有效减少运算量.利用该方法完成微振动干扰对空间相机像质退化的仿真模拟,结合动态成像评价标准分析判断微振动对系统像质的影响程度,得到光学元件微振动与像质退化之间的关系,为系统优化设计和隔振补偿措施提供参考依据.

In order to evaluate the space camera image degradation induced by micro-vibration,an integrated modeling was utilized.During the CCD integrated time,the image motion of dynamical imaging system equaled to static image spot blurring,dynamical imaging evaluation criterion was proposed and dynamical imaging was analyzed.All kinds of disturbance sources were introduced,the finite element model （FEM） of space camera was founded,and the jitter values of optical elements were acquired by dynamic analysis with finite element software.The analysis results were imported to optical design software CODE V,the system spot diagram and MTF were attained,and the image motion was calculated quickly.The integrated modeling which shortens the computational quantity effectively suits to any type of micro-vibration.This method was utilized to simulate the space camera image degradation induced by micro-vibration,and the dynamical imaging evaluation criterion was used to estimate the effects on imaging system.The relationship between micro-vibration and image degradation was achieved,that provides important references for system optimum design and vibration isolation.