星载高光谱成像仪在轨偏航定标方法  

In-orbit Side-slither Calibration Method of Spaceborne Hyperspectral Imager

作　　者：梁德印 余婧 韩波[1] 朱海健 LIANG Deyin;YU Jing;HAN Bo;ZHU Haijian(Institute of Remote Sensing Satellite, China Academy of Space Technology, Beijing 100094, China;Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China)

机构地区：[1]中国空间技术研究院遥感卫星总体部,北京100094 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《航天器工程》2021年第5期24-31,共8页Spacecraft Engineering

基　　金：国家重大航天工程。

摘　　要：高光谱成像仪以其纳米级光谱分辨率可同时获取地物的图像和光谱信息,辐射定标的精度是其定量化应用的关键环节,而偏航定标降低了对定标场地的选择要求,为高光谱成像仪在轨高频次定标提供了支撑。文章提出一种基于卫星平台90°偏航机动的高光谱成像仪在轨偏航定标方法,包括偏航数据的获取及数据处理、分析方法。基于资源一号02D卫星在轨数据对此方法进行了验证,结果表明:该方法对高光谱成像仪的相对辐射校正具有良好的效果,探测器所有像元相对辐射定标精度可达1%,原始图像中的条纹噪声得到很好去除。文章提出的方法可以实现高光谱成像仪的高频次、全视场相对辐射校正,为后续高光谱数据的定量化应用打下基础。Hyperspectral imager can obtain the image and spectral information of the ground objects at the same time by nanometer-level spectral resolution and continuous spectral channels.The radiometric calibration accuracy of a hyperspectral imager is a key link in its quantitative application.The side-slither calibration reduces the requirements for the selection of the calibration site,and provides support for the high-frequency calibration of the hyperspectral imager in orbit.In this paper,an in-orbit side-slither calibration method of hyperspectral imager based on satellite platform 90°yaw maneuver is proposed,including the obtaining of side-slither data and data processing and analysis method.A verification of this method is carried out based on the in-orbit data of ZY-1-02D satellite,and the results show that the proposed method has good performance for relative radiometric calibration of spaceborne hyperspectral imager,the relative radiometric calibration accuracy of all the sensor pixels can reach 1%,and the fringe noise in the original image is well removed.High-frequency and full field of view relative radiometric calibration of hyperspectral imager can be realized by this method,which can provide good foundation for quantitative application of hyperspectral data.

关 键 词：高光谱成像仪 在轨偏航定标 定标精度 

分 类 号：V474.2[航空宇航科学与技术—飞行器设计]