Spaceborne squint isometric scanning imaging

被引：0
|
作者：
Wang H. [1 ,2 ]
Shi Z. [1 ,2 ]
Gong H. [1 ,2 ]
Wang J. [1 ]
Tang S. [1 ]
机构：
[1] Beijing Institute of Space Mechanics & Electricity, Beijing
[2] Key Laboratory for Space-Based Target Monitoring Technology of CAST, Beijing
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2022年 / 51卷 / 03期
关键词：
Cross-track scanning; Low resolution degradation; Squint isometric scanning; Wide width;
D O I：
10.3788/IRLA20210390
中图分类号：
学科分类号：
摘要：
A new spaceborne imaging method based on squint isometric scanning was presented to overcome the problems of resolution degradation and atmospheric radiation difference with scanning angle in traditional cross-track scanning imaging method. Firstly, the principle of this imaging method was introduced, and the geometric imaging model was established according to the theory of geometric optics. Then, based on the geometric imaging model, the relationship between the scanning direction spatial resolution, vertical scanning direction spatial resolution and width with the scanning angle were given. Furthermore, the expressions of resolution and width for multi-angle observation via satellite pitch were derived. Finally, the simulation results of one pre-research spaceborne imager show that the resolution degradation is greatly reduced. When scanning angle is 60°, the edge view resolution is 2.5 times of central field of view far lower than traditional cross-track scanning imaging method 9.5 times. It provides a new solution for wide width imaging and has a certain reference significance for promoting the development of super wide width, high resolution and multi-angle spaceborne remote sensing. Copyright ©2022 Infrared and Laser Engineering. All rights reserved.
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