CAJ | 학술논문

随着时间延迟积分技术(Time Delayed and Integration，TDI)的不断成熟，具有TDI功能的电荷耦合器件(Charge Coupled Devices，CCD)已经广泛应用到高分辨率对地成像系统。然而，采用TDI功能的成像系统在推扫成像过程中必然会受到像移的影响，导致最终成像模糊。主要分析了TDI成像过程中光学系统畸变引起像移的原因，推导了畸变产生像移的数值计算公式，分析了光学系统畸变对TDI成像相机调制传递函数的影响，研究了畸变和像移导致的TDI成像相机图像退化的关系，针对焦距为9000 mm、积分级次96级、地面像元分辨率GSD=0.6 m，F/p=1、信噪比为50：1的TDI成像相机，计算了在畸变产生的像移影响下导致的NIIRS(National Imagery Interpretability Rating Scale，美国国家图像解译度分级标准)的变化值△NIIRS，计算结果表明在畸变导数值D’()=6.493时引起的△NIIRS达到-0.1624将影响图像的解译需求，最后分析给出了对于该空间相机不影响解译需求的D’()限制条件。可为光学遥感TDI成像系统的设计提供参考。
수착시간연지적분기술(Time Delayed and Integration，TDI)적불단성숙，구유TDI공능적전하우합기건(Charge Coupled Devices，CCD)이경엄범응용도고분변솔대지성상계통。연이，채용TDI공능적성상계통재추소성상과정중필연회수도상이적영향，도치최종성상모호。주요분석료TDI성상과정중광학계통기변인기상이적원인，추도료기변산생상이적수치계산공식，분석료광학계통기변대TDI성상상궤조제전체함수적영향，연구료기변화상이도치적TDI성상상궤도상퇴화적관계，침대초거위9000 mm、적분급차96급、지면상원분변솔GSD=0.6 m，F/p=1、신조비위50：1적TDI성상상궤，계산료재기변산생적상이영향하도치적NIIRS(National Imagery Interpretability Rating Scale，미국국가도상해역도분급표준)적변화치△NIIRS，계산결과표명재기변도수치D’()=6.493시인기적△NIIRS체도-0.1624장영향도상적해역수구，최후분석급출료대우해공간상궤불영향해역수구적D’()한제조건。가위광학요감TDI성상계통적설계제공삼고。
With the Time Delayed and Integration (TDI) technology continues to evolve, Charge Coupled Devices (CCD) with TDI feature has been widely applied to high-resolution earth imaging system. However, in the push-broom imaging process, imaging system using TDI technology would inevitably be affected by the image motion, finally leading to blur image. The reason of image motion caused by optical system distortion in the process of TDI imaging was analyzed, formula of the image motion value was derived, the influence of optical system distortion on Modulation Transfer Function was analyzed, and the relationship between image quality deterioration caused by image motion and distortion was studied. Degradation of National Imagery Interpretability Rating Scale (NIIRS) parameters △NIIRS caused by image motion that generated by distortion was calculated for the TDI imaging system of which focal length was 9 000 mm, integral stage was 96, grounding sample distance was 0.6 m, F/p was 1, SNR was 50:1 . The results showed when the derivative value of distortion was 6 . 493 , △NIIRS would reach- 0.162 4, and would affect the image interpretation requirements. Finally, for this space camera, the restriction value of D’ ( ) without affecting interpretation requirements was given. This research could provide a reference for optical TDI remote sensing system design.