用作图法判定航空相机TDI CCD积分方向

由于Time Delay and Integration CCD(TDI CCD)是一种类似面阵结构的线阵输出CCD,其光电荷转移具有一定的方向性,所以TDI CCD图像传感器的积分方向与CCD成像运动方向必须保持一定的关系才能成像。本文以推扫成像相机和摆扫成像相机为例,介绍了一种基于高斯成像原理的作图法,用以确定TDI CCD积分方向与传感器成像运动方向的关系,分析和论证表明,TDI CCD的积分方向必须与地物在像面上的像移方向一致。 实践证明这种方法可以清楚、简便、快速地确定TDI CCD的积分方向,从而确定TDI CCD的安装方向,适宜在实际的工程设计中采用。

Estimation of TDI direction of CCD sensor in aerial camera by graphing method

Time Delay and Integration CCD(TDI CCD) is a kind of CCD with frame structure and linear output, its charge transfer has certain directivity. Therefore, CCD integral direction and TDI CCD imagery heading must maintain certain relation for imaging. This article takes a push-broom and a whiskbroom scanning camera as examples,and introduces a graphing method based on Guassian imaging system to determine the relation between TDI CCD integral direction and sensor imagery heading. The conclusion is that integral direction must be in accordance with image motion direction. The result shows that this method is intuitional, practical and easy to determin TDI CCD integral direction,which is suitable for the practical engineering design.