数字域斜模态时间延迟积分技术

Digital domain tilting model time delayed and integration technology

为了实现遥感图像超分辨目的,提出数字域斜模态时间延迟积分(Digital Domain Tilting Model Time Delayed and Integration,DT-TDI)技术。对技术过程所涉及的数字域TDI技术、倾斜采样成像理论、数字域斜模态TDI技术等分别进行分析与研究。首先,构建通用的数字域TDI模型。之后,利用倾斜采样成像思想,构建适用于不同倾斜角度下的DT-TDI模型。然后,以45°倾角对模型进行实验验证,获取该角度一定姿轨条件下的序列低分辨率图像。最后,通过超分辨算法对具有亚像素位移的低分辨率图像序列进行超分辨重构,获取高分辨率图像。实验结果表明,DT-TDI技术可在不同倾斜模态下进行稳定成像,45°倾角时获取的低分辨率图像亚像素位移误差约15%,基本满足超分辨重构需求。重构后图像分辨率明显提升。

In order to realize super-resolution of remote sensing picture,an digital domain tilting model time delayed and integration（DT-TDI）technology is proposed,and its relevant technologies such as digital domain TDI technology,tilting sampling imaging theory,DT-TDI technology and etc are analysed and investigated.First,we establish general digital TDI model;then establish DT-TDI model applied to different tilt angle by utilizing tilting sampling imaging theory,then we choose tilt angle of45°and prove the accuracy of DT-TDI by experiment,and obtain a series of low resolution images of a certain attitude and orbit in this angle.Finally,we reconstruct the low resolution images of subpixelshifting via super-resolution algorithm and obtain high resolution image.Experimental results indicate that the DT-TDI technology has a stable imaging capability,and the subpixel shifting error of low resolution images is about 15%in 45°,and the DT-TDI technology is satisfied with the demand of super-resolution.The resolution ratio of image is raised obviously after reconstruction.