| 视频卫星在轨相对辐射定标方法 |
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| 引用本文： | 王灵丽,白杨,潘征,谷文双,武红宇. 视频卫星在轨相对辐射定标方法[J]. 红外与激光工程, 2018, 47(8): 817003-0817003(6). DOI: 10.3788/IRLA201847.0817003 |
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| 作者姓名： | 王灵丽 白杨 潘征 谷文双 武红宇 |
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| 作者单位： | 1.长光卫星技术有限公司,吉林 长春 130051; |
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| 基金项目： | 吉林省科技发展计划项目（20180201108GX） |
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| 摘 要： | 视频卫星利用敏捷姿态性能对地凝视成像，实现对目标的动态监测。为了消除视频卫星获取时序图像中由探测元件响应差异引起的非均匀性，获得清晰的图像和准确的辐射信息，需要针对视频卫星传感器进行相对辐射定标。由于成像机理不同，基于统计的在轨辐射定标方法并不适用于视频卫星，提出采用均匀场景的视频卫星在轨相对辐射定标方法，分别对云层、海洋和沙漠三种典型的均匀场景进行凝视视频成像，解算相对辐射定标系，其中，沙漠场景的处理取得了较好的相对辐射定标系数，校正吉林一号视频单帧影像。该方法能够有效修复图像缺陷，图像的非均匀性由3.7%降低至1.2%。
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| 关 键 词： | 视频卫星 凝视成像 在轨相对辐射定标 均匀场景 |
| 收稿时间： | 2018-03-05 |
On-orbit relative radiometric calibration method of video satellite |
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| Affiliation: | 1.Chang Guang Satellite Technology Co.,Ltd.,Changchun 130051,China;2.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China |
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| Abstract: | The video satellite uses the agile attitude performance to stare imaging for ground achieving the dynamic monitoring of the target. In order to eliminate the non-uniformity of sequence images acquired by the video satellite sensor, which was caused by the response difference of the detection element. To obtain the clear image and the accurate radiation information, relative radiometric calibration was needed for video satellite sensors. Because of the different imaging mechanism between video satellite and push-broom satellite, on-orbit radiometric calibration methods based on the statistics were not suitable for video satellite. The uniform scene on-orbit relative radiometric calibration method to video satellite was proposed, through staring imaging for three typical uniform scenes including cloud, ocean and desert respectively to calculate relative radiometric calibration coefficients. Among them, the processing of desert scene had achieved better relative radiometric calibration coefficients, which was used for correcting single frame image of Jilin-1 video satellite. The method could effectively repair the image defects, and the non-uniformity of the image was reduced from 3.7% to 1.2%. |
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