微光条件下遥感器像移补偿机构设计及控制方法  

Design and Control Methods Research of a Motion Compensation System under Low-Light-Level Imaging Condition

作　　者：康建兵[1] 王芸[1] 于婷婷 林喆[1] KANG Jianbing;WANG Yun;YU Tingting;LIN Zhe(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》2023年第4期39-47,共9页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金(B2YG1460)。

摘　　要：夜间成像时,遥感成像地面目标的辐亮度可低至白天的10–6,在提升弱信号获取能力的各种措施中,通过长曝光时间提升信噪比是一种直接而有效的解决方式,但是在低轨遥感任务中其实现却受到极大限制。为完成探测目标凝视,文章提出通过光路中的像移补偿机构实现光轴稳定的解决方案,补偿了相机相面与地物的相对运动,在曝光时间内使探测器相面景物与地物景物保持相对静止,从而实现灵活微光成像模式;具体阐述了微光条件下遥感器像移补偿机构的设计和控制方法,对其原理及设计进行了详细分析,并进行仿真及试验验证,结果表明所设计的像移补偿系统可将图像抖动补偿至0.2像元之内,为低轨遥感微光成像系统提供了优异的解决途径。In comparison with the radiation of the ground targets at daylight,under low-light-level imaging condition,the radiation could be reduced to one in a million for a remote sensing system.Among various measures to improve the ability to detect low-light-level signal,longer exposure time is considered as a direct and effective step,which is essentially difficult to acquire in a low-earth-orbit system.In order to stare at target,a solution of line of sight stabilization was provided by means of the image motion compensation mechanism in this paper.In time of exposure,a motionless focal plane targets relative to ground targets was accomplished with low-light-level imaging ability.The research of design and control methods of a motion compensation system under low-light-level imaging condition is elaborated.Simulation and test results indicate that the motion compensation system can compensate image motion less than 0.2 pixels,providing an excellent solution to low-light-level sensing.

关 键 词：微光成像 像移补偿 光轴稳定 信噪比 星载遥感器 

分 类 号：V445[航空宇航科学与技术—飞行器设计]