摆扫式TDI-CCD航空相机传感器MTF分析  

Analysis on image sensor MTF of whiskbroom scan TDI-CCD aerial camera

作　　者：范秀英[1] 鲍金河[1] 张勇[1] 

机构地区：[1]空军航空大学特种专业系,长春130022

出　　处：《光学技术》2012年第5期634-637,共4页Optical Technique

摘　　要：TDI-CCD与普通线阵CCD相比具有很多优点,因而广泛应用于航空航天成像领域。在介绍TDI-CCD特点和摆扫式TDI-CCD航空相机扫描成像原理的基础上,分析了扫描像移的大小及行周期,推导出了由几何尺寸、电荷转移损失率、电荷分立运动、速度失配等因素引起图像传感器的调制传递函数退化表达式,给出了传感器线列方向和TDI方向的调制传递函数,提出了提高传感器调制传递函数的几种方法,对TDI-CCD航空相机整机设计提供了参考。The time-delay-integration CCD（TDI-CCD） has many merits in comparison with a common linear CCD, so it is widely applied in the aerospace imaging field. The features of TDI-CCD and scan imaging principle of whiskbroom scan TDI-CCD aerial camera are introduced, The scan image motion rate and line scan cycle are firstly analyzed. The deg- radation expressions of the image sensor modulation transfer function （MTF） affected by the factors including pixel di- mension, charge transfer loss efficiency, charge discrete moving, and velocity mismatch are deduced. Then the MTFs in sensor array direction and TDI-CCD direction are given. Some ways to improve the MTF of sensor are presented, which can provide references for the design of TDI-CCD aerial camera.

关 键 词：TDI-CCD 调制传递函数 扫描像移 

分 类 号：V245.6[航空宇航科学与技术—飞行器设计] TN386.5[电子电信—物理电子学]