空间超大视场相机速度失配对成像质量的影响  

The Influence on Image Quality by Speed Mismatch of Space Camera With Huge FOV

作　　者：董龙平 徐菲菲[1] 黄小仙[1] 尹达一[1] DONG Longping XU Feifei HUANG Xiaoxian YIN Dayi(Shanghai Institute of Technical and Physics, Chinese Academy of Sciences, Shanghai 200083, China University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院上海技术物理研究所,上海200083 [2]中国科学院大学,北京100049

出　　处：《红外技术》2016年第9期733-738,共6页Infrared Technology

基　　金：国家自然科学基金(40776100)

摘　　要：空间超大视场时间延迟积分电荷耦合器件(TDI-CCD)相机能在提高观测刈幅的同时有效提高相机灵敏度,然而在其遥感过程中,由于存在地球曲率,导致相机边缘视场地面分辨率退化严重。在分析空间超大视场相机成像的基础上,推导出空间超大视场相机在不同视场位置速度失配比和调制传递函数(MTF)的计算公式。并以某空间超大视场相机为例,分析了TDI-CCD探测器统一和分片调整行转移周期对成像质量的影响。分析实验结果表明,以MTF在空间奈奎斯特频率处下降不超过10%为约束条件,在TDI-CCD积分阶数为4阶时,当空间超大视场相机总视场不超过55?时,可以采用统一调整探测器行转移周期的方法进行像移补偿;当空间超大视场相机总视场达到120?时,采用分片调整行转移周期的方法可将满足要求的像元视场从47.8%提高到86.5%。Space charge-coupled device time delay integration（TDI-CCD） camera with huge FOV can improve the observation swath and the camera sensitivity effectively. But during the imaging process of space camera with huge field of view, because of the curvature of the earth, the edge field resolution of camera reduced. It is derived that formula for calculating speed mismatch ratio and Modulation Transfer Function（MTF） of space camera with huge field of view in a different field position. The influence on TDI-CCD detector imaging quality by adjusting row transfer periods uniformly and separately in a camera with a space huge field of view is analyzed. The results of experiments and analysis suggest when the falling of MTF no more than 10% in spatial Nyquist frequency, the integration time is 4, adjusting row transfer periods uniformly can be used with the huge field no more than 55° for image motion compensation, when the total huge field reach 120°, the field of view pixels witch meet the requirements increase from 47.8% to 86.5% when adjusting row transfer periods separately.

关 键 词：空间遥感 速度失配 超大视场相机 调制传递函数 TDI-CCD 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]