数字域TDI成像MTF下降机理及图像式消校配准时间延迟积分技术研究

获取高质量遥感图像是世界各国不断追求的目标。我国像移补偿精度与西方军事强国存在差距，而星上图像处理算法鲜有应用，成为制约遥感成像质量的重要因素。结合数字域TDI像质提升需求，项目提出一种图像式消校配准时间延迟积分崭新思路，将图像消校、像移补偿集成于TDI，直接获取像质提升的积分图像。首先基于图像和位姿组合构建像移分布场，解决传统像移计算振动测量难题；然后将图像去畸变模糊和像移补偿与新型数字域TDI算法结合在一起，省去复杂调偏流机构，并克服积分图像后处理难度大效果差缺陷。本项目将在研究目标牵引下，突破数字域TDI成像MTF下降机理分析、暗小畸变图像与低频延时位姿的多元快速精确像移分布场构建、任意位姿动态复杂畸变像移分布的精细校正补偿时间延迟积分建模等关键科学问题。项目研究是对我国现有TDI遥感成像机制的革新，同时使得数字域TDI如虎添翼，对提高我国高性能遥感成像水平有重要意义。

Obtaining high quality remote sensing image has been the goal of all countries in the world. There is a gap between the precision of image motion compensation in China and that in the Western military powers, and the image processing algorithm on the satellite is rarely used, which has become an important factor restricting the quality of remote sensing imaging. Combined with the demand of TDI image quality improvement in digital domain, a new idea is proposed in the project, which integrates image correction and image motion compensation into TDI to directly obtain the integrated image of quality improvement. Firstly, the image motion distribution field is constructed based on the combination of image and pose to solve the vibration measurement problem of traditional image motion calculation; then, the image de distortion blur and image motion compensation are combined with the new TDI algorithm in digital domain to realize the fine correction compensation of complex distortion and image motion of any pose, to eliminate the complex drift adjustment mechanism, and to overcome the difficulty of post-processing of integrated image. This project will break through some key scientific problems, such as the analysis of MTF descent mechanism of TDI imaging in digital domain, the construction of multivariate fast and accurate image motion distribution field of dark and small distortion image and low-frequency delayed pose, and the modeling of time delay integration in digital domain with precise correction and compensation in the case of complex dynamic distortion image distribution of any pose. The project research is an innovation of the existing TDI remote sensing imaging mechanism in our country, and makes the TDI in digital domain more powerful, which is of great significance to improve the high-performance remote sensing imaging level in China.