| 一种机载红外光谱相机的角位置误差补偿技术 |
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| 引用本文： | 董浩,孙拓,吴丽娜,唐帅,刘晓波.一种机载红外光谱相机的角位置误差补偿技术[J].红外与激光工程,2019,48(10):1013007-1013007(6). |
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| 作者姓名： | 董浩 孙拓 吴丽娜 唐帅 刘晓波 |
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| 作者单位： | 1.天津津航技术物理研究所,天津 300308; |
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| 基金项目： | 国家某高分重大专项民用航空项目 |
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| 摘 要： | 机载红外多光谱扫描仪采用摆扫扫描成像机制，解决了红外光谱相机的光谱分辨率、高空间分辨率和大成像幅宽之间的矛盾，可实现下视和远距离侧视成像。为了实现采集图像无缝拼接的像元级对准，需保证红外光谱仪的角位置信息准确。本文针对机载扫描成像光谱仪的几何定位问题进行分析，指出角位置误差是影响相机几何定位的主要因素，进而采用一种角位置误差的长短周期双重补偿方法，对角位置误差进行补偿。地面测试结果表明，补偿后相机角位置精度提高10倍，且经环境试验验证，角位置误差仍保持稳定。由机载挂飞试验结果表明，后图像相对几何精度优于一个像元（10），满足图像拼接的几何定位需求。
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| 关 键 词： | 机载红外光谱相机 扫描成像 几何定位 角位置误差补偿 |
| 收稿时间： | 2019-06-05 |
An angular error compensation technology for airborne infrared spectral camera |
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| Affiliation: | 1.Tianjin Jinhang Research Institute of Technical Physics,Tianjin 300308,China;2.Institude of Spacecraft Application System Engineering,China Acadamy of Space Technology,Beijing 100094,China;3.Tianjin TSINTEL Technology Co.,Ltd,Tianjin 300308,China |
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| Abstract: | An airborne infrared multispectral scanner can image remotely both in downward-looking and side-looking modes, by solving the contradiction among spectral resolution, high spatial resolution and large FOV imaging with whole device whiskbroom working mode. A theoretical accuracy of the object positioning error can be acquired by simulating the imaging geometry, which indicates that the angle measuring accuracy of the infrared multispectral scanner is the main error source, and should be precise enough to guarantee the linear whisk broom stripe images' pixel-level mosaic accuracy. Subsequently, a method of angular error compensation was adopted to reduce the long term and short term error. After compensation, the angle precision was ten times higher than before through labrotary test, and the accuray remained stable by environmental test. Also, the airborne flight test verifies the effectiveness of the compensation technology, the image relative geometric positioning accuracy is less than one pixel(10), which can meet the requirements of image mosaic. |
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