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数字域时间延迟积分时间CMOS相机高分“凝视”成像设计分析
引用本文:杨秀彬,姜丽,金光.数字域时间延迟积分时间CMOS相机高分“凝视”成像设计分析[J].光学学报,2012,32(9):911004-109.
作者姓名:杨秀彬  姜丽  金光
作者单位:杨秀彬:中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
姜丽:长春理工大学理学院, 吉林 长春 130022
金光:中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
基金项目:国家863计划(O93J32F090)和国家自然科学基金青年基金(60902067)资助课题。
摘    要:为实现凝视卫星高分跟踪成像,设计了数字域时间延迟积分(TDI)互补金属氧化物半导体(CMOS)传感器在凝视姿态下的成像匹配模型,推导了卫星凝视跟踪成像时相对轨道坐标系的姿态变化,采用坐标变换方法实时计算其在凝视过程中随姿态变化的行转移时间,利用蒙特卡罗方法统计计算了凝视模式下姿态指向精度和稳定度对成像的影响。利用数字域TDI CMOS原理样机和小卫星姿态控制系统全物理仿真平台对成像进行了仿真分析。结果表明,卫星的姿态控制精度在成像过程中会引起纵向的像移速度失配和横向匹配的残余像移,成像积分级数越高,图像信噪比越大。积分级数的增加对卫星姿态提出较高要求,仿真平台姿态角和姿态角速度控制精度分别优于0.05°,0.005°/s时,采用积分级数为48级能较好地满足成像质量要求。

关 键 词:成像系统  时间延迟积分  互补金属氧化物半导体  凝视成像  调制传递函数  信噪比
收稿时间:2012/3/23

Design and Analysis of CMOS Camera Based on TDI in Digital Domain to Realize High-Resolution Staring Imaging
Yang Xiubin,Jiang Li,Jin Guang.Design and Analysis of CMOS Camera Based on TDI in Digital Domain to Realize High-Resolution Staring Imaging[J].Acta Optica Sinica,2012,32(9):911004-109.
Authors:Yang Xiubin  Jiang Li  Jin Guang
Institution:1Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun,Jilin 130033,China 2School of Science,Changchun University of Science and Technology,Changchun,Jilin 130023,China
Abstract:The imaging matching model of the digital domain time-delay integral (TDI) complementary metal-oxide-semiconductor (CMOS) sensor under the staring gesture is designed in order to realize high-resolution staring imaging, attitude which satellite changes relative to orbital coordinate system staring on satellite staring tracing imaging is derived. The coordinate transformation method is used to real-time compute the time of the line transfer process in the staring, the method of Monte Carlo is used to statistically calculate the influence of imaging under the satellite′s attitude point precision and stability in the mode of staring imaging. The TDI CMOS prototype and the minitype three-axis air bearing table constructed for attitude control are used to simulate the digital domain TDI CMOS staring imaging. Experimental results show that the satellite′s attitude control accuracy will cause the vertical image velocity mismatch and the residual image of transverse matching in the process of imaging. The higher imaging integral series is, the greater the signal-to-noise ratio (SNR) of the image will be. Integral series increase has a higher requirements to the satellite attitude. The control accuracy of the attitude angles and attitude angular velocity of the staring imaging simulation platform is better than 0.05° and 0.005°/s, the integral series 48 can meet the image-quality requirement.
Keywords:imaging systems  time-delay integral  complementary metal-oxide-semiconductor  staring imaging  modulation transfer function  signal-to-noise ratio
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