基于光线追迹的长线列摆扫式热像仪在轨几何成像仿真方法
作者:
作者单位:

1.国科大杭州高等研究院,浙江 杭州 310024;2.中国科学院智能红外感知重点实验室,上海 200083;3.中国科学院上海技术物理研究所 红外探测与成像技术重点实验室,上海 200083;4.中国科学院大学, 北京 100049

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中图分类号:

P236

基金项目:

中国科学院SDGSAT-1小卫星红外热像仪项目(XDA19010102)


In-orbit geometric imaging simulation based on ray-tracing for long-linear-array and whisk-broom thermal infrared imager
Author:
Affiliation:

1.Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China;2.Key Laboratory of Intelligent Infrared Perception, Chinese Academy of Sciences, Shanghai 200083, China;3.CAS Key Laboratory of Infrared System Detection and Imaging Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;4.University of Chinese Academy of Sciences, Beijing 100049, China

Fund Project:

Supported by the SDGSAT-1 Mini-satellite Thermal Infrared Imager Project, Chinese Academy of Sciences (XDA19010102)

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    摘要:

    针对卫星发射前在轨数据缺乏导致的无法进行成像质量评估、链路分析及几何处理算法验证等问题,提出了一种基于光线追迹的长线列摆扫式热像仪在轨几何成像仿真方法。首先根据光学系统结构及成像特点,构建了长线列摆扫式热像仪严格几何定位模型;然后,基于姿轨仿真数据、DOM和DEM辅助数据,通过光线追迹及重投影算法实现了像元视矢量的空间投影及成像仿真;最后,提出了基于“广义”修正矩阵的几何检校方法,通过修正定位模型提高了仿真影像定位精度。实验结果表明,该方法可实现长线列摆扫式热像仪任意轨道位置的几何成像仿真,检校后仿真影像定位精度优于2个像元。该研究为空间光学载荷在轨几何成像仿真提供了新思路,对成像链路误差源分析、几何定位及检校方法研究具有重要意义。

    Abstract:

    In order to solve the problems of image quality evaluation, imaging link analysis and subsequent processing algorithm verification due to the lack of in-orbit data before satellite launch, an in-orbit geometric imaging simulation method for long-linear-array and whisk-broom (LLAWB) thermal infrared imager (TIRI) based on ray tracing is proposed. Firstly, according to the structure and imaging characteristics of the optical system, the rigorous geometric imaging model of the LLAWB TIRI is constructed. Then, based on the simulation attitude and orbit parameters, auxiliary DOM and DEM data, the spatial projection and imaging simulation of pixel visual vector are realized by ray tracing and re-projection algorithm. Finally, a geometric calibration method based on "generalized" correction matrix is proposed to modify the positioning model and improve the positioning accuracy of simulation images. Experimental results show that the proposed method can be used to simulate the geometric imaging of any orbit position for the LLAWB TIRI, and the positioning accuracy of the simulation image is better than two pixels after calibration. This research provides a new idea for in-orbit geometric imaging simulation of space optical payloads, and is of great significance to the error analysis, geometric positioning and calibration of imaging links.

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李潇雁,胡琸悦,江林逸,陈凡胜.基于光线追迹的长线列摆扫式热像仪在轨几何成像仿真方法[J].红外与毫米波学报,2022,41(1):199~209]. LI Xiao-Yan, HU Zhuo-Yue, JIANG Lin-Yi, CHEN Fan-Sheng. In-orbit geometric imaging simulation based on ray-tracing for long-linear-array and whisk-broom thermal infrared imager[J]. J. Infrared Millim. Waves,2022,41(1):199~209.]

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  • 收稿日期:2021-10-20
  • 最后修改日期:2021-11-19
  • 录用日期:2021-11-22
  • 在线发布日期: 2022-01-05
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