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红外高光谱大气探测仪(FY-3E/HIRAS-Ⅱ)在轨数据非线性校正方法OA北大核心CSTPCD

Nonlinear response correction method for on-orbit data of FY-3E hyperspectral infrared atmospheric sounder Ⅱ

中文摘要英文摘要

风云三号E星(FY-3E)搭载的高光谱大气探测仪(HIRAS-Ⅱ)能够实现大气的垂直探测,具有高光谱、高灵敏度、高精度的特点.仪器在轨之后由于仪器衰减和环境变化的原因产生非线性响应,影响在轨定标精度.针对非线性响应的问题,提出了一种基于带内光谱的非线性校正方法.首先基于带外低频光谱的非线性特征求解非线性校正系数,将此系数作为初值输入到辐射定标模型中,以星上测量的黑体带内光谱与理想光谱的偏差为目标函数,通过迭代优化非线性校正系数.通过辐射定标实验得出,校正后的黑体亮温偏差明显低于未校正和基于带外光谱的校正方法.将HIRAS-Ⅱ的观测数据与IASI进行交叉比对并计算平均亮温偏差和偏差绝对值,经过带内校正法非线性校正后的亮温平均偏差为-0.13 K,优于带外校正方法.

The Infrared Hyperspectral Atmospheric Sounder Ⅱ(HIRAS-Ⅱ)mounted on Funyun-3E satellite(FY-3E)can realize vertical atmospheric detection,featuring hyper spectral,high sensitivity and high precision.When the satel-lite has been on-orbit,nonlinear response would occur due to instrument attenuation and environmental change,which affects the accuracy of on-orbit calibration.For nonlinear response problems,a nonlinear correction method based on in-band spectrum is proposed.Firstly,the nonlinear correction coefficient was solved based on the nonlinear characteris-tics of the out-of-band in low-frequency spectra,and the coefficient was input into the radiological calibration model as the initial value.The deviation between the black-body spectrum measured on board and the ideal spectrum was taken as the objective function,and the nonlinear correction coefficient was optimized by iterative calculation.Radiation calibra-tion experiments have shown that the brightness temperature deviation of black body is reduced compared to uncorrected result and the out-of-band correction method using the proposed method.Based on the simultaneous nadir overpass meth-od,After matching the observed data of HIRAS-Ⅱ with IASI and calculating the mean brightness temperature deviation and the absolute value of the deviation,the mean brightness temperature deviation after nonlinear correction by the in-band correction method is-0.13 K,which is better than the out-of-band correction method.

黄硕;顾明剑;胡勇;杨天杭;邵春沅;张春明

中国科学院红外探测与成像技术重点实验室,上海 200083||中国科学院上海技术物理研究所,上海 200083中国科学院红外探测与成像技术重点实验室,上海 200083||中国科学院上海技术物理研究所,上海 200083||中国科学院大学,北京 100049

电子信息工程

HIRAS-Ⅱ非线性校正在轨定标带内光谱

HIRAS-Ⅱnonlinearity correctionon-orbit calibrationin-band spectrum

《红外与毫米波学报》 2024 (001)

98-105 / 8

国家重点研发计划(2018YFB0504800,2018YFB0504802),上海市"基础研究特区计划"(JCYJ-SHFY-2022-004)Supported by the National Key R&D Program of China(2018YFB0504800,2018YFB0504802),Shanghai Pilot Program for Basic Research-Chinese Academy of Sciences,Shanghai Branch(JCYJ-SHFY-2022-004)

10.11972/j.issn.1001-9014.2024.01.014

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