象移对星载TDICCD相机成像品质的影响分析

像移是影响星载时间延迟积分电荷耦合器件（TDICCD）相机成像品质的重要因素。为研究像移对TDICCD像质的影响，首先分析了像移引起图像模糊和几何变形的机理，研究了像移降质的辐射和几何方面评价参量。依据TDICCD工作原理，建立了像移影响下TDICCD相机空变降质模型，并以此为基础，计算并分析了不同形式、不同方向上的像移影响下的像质下降情况。分析结果表明，不同方向、不同形式的像移引起的成像品质下降是不同的。文章中提出的空变降质模型可以为后续的仿真及像移降质图像的恢复等提供参考。

Influence Analysis of Image Motion on Image Quality of Satellite-board TDI Camera Optical System

Image motion is a significant factor influencing image quality of satellite-board TDICCD cam- era. In order to learn the effect of image motion on TDICCD, mechanism of image blurring and geometric dis- tortion due to image motion is firstly analyzed, and radiometric and geometric evaluation parameters of image degradation due to image motion are researched. According to operation principle of TDICCD, a space-variant motion degradation model of TDI image is established. Based on this model, image degradation caused by im- age motion of different kinds and different directions is calculated and analyzed. The analysis results show that image motion of different kinds and different directions cause different degradation. The model proposed by this paper to illustrate dynamic imaging process of TDICCD can be prerequisite to preparation for the image simulation and restoration due to vibration.