| 引用本文: | 吕原,丛明煜,唐勇,牛凯庆,赵旖旎.干涉型成像光谱仪在轨辐射定标技术应用[J].哈尔滨工业大学学报,2022,54(12):17.DOI:10.11918/202108080 |
| LÜ Yuan,CONG Mingyu,TANG Yong,NIU Kaiqing,ZHAO Yini.Application of on-orbit radiometric calibration technology for interferometric imaging spectrometer[J].Journal of Harbin Institute of Technology,2022,54(12):17.DOI:10.11918/202108080 |
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| 摘要: |
| 为提高干涉型成像光谱仪空间目标测量精度，降低传感器中各个探测元响应度差异，提升成像光谱仪在轨辐亮度测量准确性。提出了一种基于定标场反射率测量参数结合计算程序仿真与成像仪在轨测量数据比对的空间定标方法。首先在介绍高光谱定标概念的基础上，提出了不同光谱响应函数、不同场地条件下的高精度入瞳亮度计算方法；其次对干涉型成像光谱仪进行在轨相对辐射修正，校正传感器中各探测元相应度差异，利用反射率基法开展了在轨绝对辐射定标试验，针对可见光、近红外波段建立在轨辐射定标计算模型。解决了包括多种反射率场地、高精度测试区域指示的试验方案优化设计问题，实现了星载高分辨率干涉型成像光谱仪的在轨高精度定标。研究结果表明，采用该定标技术使成像光谱仪的在轨测量精度达到5%。此外，定标场地环境条件对模型计算精度有一定影响，大面积均匀场适合采用反射率基法，小面积均匀场则引入邻近像元效应进行计算，通过布设人工指示目标，可提高反射率测量数据的准确性。所采用的定标技术已获得工程应用。 |
| 关键词: 在轨定标 干涉成像 场地定标 辐射定标 相对辐射修正 绝对辐射修正 |
| DOI：10.11918/202108080 |
| 分类号:V443.2 |
| 文献标识码:A |
| 基金项目: |
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| Application of on-orbit radiometric calibration technology for interferometric imaging spectrometer |
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Yuan LÜ1, Mingyu CONG1, Yong TANG2, Kaiqing NIU2, Yini ZHAO2
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1.Research Center for Space Optical Engineering, Harbin Institute of Technology, Harbin 150006, China;2.Institute of Telecommunication and Navigation Satellites, China Academy of Space Technology, Beijing 100094, China
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| Abstract: |
| To improve the measurement accuracy of interferometric imaging spectrometer for space target, reduce the response difference of each detection element in the sensor, and improve the on-orbit radiance measurement accuracy of imaging spectrometer, we proposed a spatial calibration method based on calibration field reflectance measurement parameters, calculation program simulation, and on-orbit measurement data comparison of imager. Firstly, the concept of hyperspectral calibration was introduced, and a high-precision calculation method of pupil entrance radiance under different spectral response functions and different site conditions was proposed. Secondly, the on-orbit relative radiation correction of the interferometric imaging spectrometer was performed, so as to correct the correspondence difference of each detection element in the sensor. The on-orbit absolute radiometric calibration test was carried out by using reflectance-based method. The on-orbit radiometric calibration calculation model was established for visible and near-infrared bands. The optimization design problems of test scheme including multiple reflectivity sites and high-precision test area indication were solved, which realized high-precision on-orbit calibration of spaceborne high-resolution interferometric imaging spectrometer. Results show that the on-orbit measurement accuracy of imaging spectrometer reached 5% by using this calibration technology. The environmental conditions of the calibration sites had impacts on the calculation accuracy of the model: the reflectance-based method was suitable for large-area uniform field, while the small-area uniform field could be calculated by introducing the adjacent pixel effect. The accuracy of reflectance measurement data could be improved by arranging manual indication targets. The calibration technology has been applied in engineering. |
| Key words: on-orbit calibration interference imaging site calibration radiometric calibration relative radiation correction absolute radiation correction |
