光电工程师社区

标题: 长线阵TDICCD空间相机像移匹配及MTF分析 [打印本页]

作者: 无盐 时间: 2015-7-13 01:19
标题: 长线阵TDICCD空间相机像移匹配及MTF分析
长线阵TDICCD空间相机像移匹配及MTF分析
Image Motion compensation and MTF analyse of long array TDICCD space camera
下载全文

长线阵TDICCD空间相机像移匹配及MTF分析.pdf (643.6 KB, 下载次数: 4)
作　　者：武奕楠张宇韩双丽金龙旭王文华
Wu Yinan Zhang Yu Han Shuangli Jin Longxu Wang Wenhua （Changehun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Seienees, Changehun 130033, China）
机构地区：中国科学院长春光学精密机械与物理研究所,长春130033
出　　处：《电子测量技术》 2014年第10期 71-75页,80页,共6页
Electronic Measurement Technology
基　　金：吉林省科技发展计划（20126016）项目
摘　　要：长线阵TDI（time delay and integration）CCD空间相机通过机动成像可以获得更宽的地面幅宽,缩短重访周期。由于角度变换和地球曲率等因素,相机不同视场位置的像移速度和偏流角存在差异,TDICCD焦面越长,机动角度越大,差异越大。通过像移解析模型计算像面上各点像速矢量,定量分析空间相机在侧摆和俯仰成像时视场上各点像移速度和偏流角差异对调制传递函数（MTF）的影响,并以MTF为约束确定各工况下的像速匹配模式和参数指标。分析结果表明：侧摆成像时,以沿TDICCD积分方向上的MTF退化为主;俯仰成像时,垂直于TDICCD积分方向上的MTF退化较多。以某工程实例计算：以传函下降5%为约束,以最大侧摆角40°成像时,可采用32级积分级数。俯仰30°成像时,可用积分级数不能超过8级;俯仰10°成像时,积分级数不超过16级。
Long array TDI（Time Delay and Integration）CCD space camera can obtain wider coverage and shorten revisit cycle by maneuvering imaging. However, the space camera shows different image motion speeds and drift angles at different positions of field of view because of angle conversion and the earth curvature. Longer the TDICCD focal plane is, larger the maneuvering angle and greater the differences are. The image motion vector in different position of the image area were calculated by the model of image motion velocity. The effect about the differences of image motion speed and drift angle among different fields of view on modulation transfer function（MTF） was quantitative analyzed when space camera imaging with pitch and scroll angle. Motion speed matching patterns and parameters of various conditions were confirmed by the restriction of MTF. The analysis result shows that MTF parallel to the direction of integral mainly declined when imaging with scroll angle; MTF perpendicular to the direction of integral mainly declined when imaging with pitch angle. By taking a engineering case for calculation： integral stages can not be over 32 when imaging with the maximum scroll angle 40°under a constraint of 5% drop for MTF. In the same way, integral stages can not be over 8 when pitching 30°imaging and 16 when pitching 10°imaging.
关键词：TDICCD空间相机像移匹配 MTF 像移速度偏流角
TDICCD space camera ; image motion compensation ; MTF ; image motion speed ; drift angle ;

作者: 诠释没落 时间: 2016-1-5 00:59

欢迎光临光电工程师社区 (http://bbs.oecr.com/)