FY-3A multi-detector radiometric calibration for infrared band of medium resolution spectral imager

HU Xiu-qing; ZHANG Li-yang; ZHENG Zhao-jun; ZHANG Yong; SUN Ling; DING Lei; HUANG Xiao-xian

doi:10.3788/OPE.20101809.1972

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FY-3A multi-detector radiometric calibration for infrared band of medium resolution spectral imager

Article | 更新时间：2020-08-12

- FY-3A multi-detector radiometric calibration for infrared band of medium resolution spectral imager
- Optics and Precision Engineering Vol. 18, Issue 9, Pages: 1972-1980(2010)
- 作者机构：
  
  1. 中国科学院遥感应用研究所北京,100101
  2. 中国气象局中国遥感卫星辐射测量和定标重点开放实验室国家卫星气象中心北京,100081
  3. 中国科学院上海技术物理研究所上海,200083
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101809.1972
  CLC： V443.5;TH744.1
- Received：11 September 2009，
  
  Revised：17 November 2009，
  
  Published Online：29 September 2010，
  
  Published：20 September 2010
- 稿件说明：
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胡秀清, 张里阳, 郑照军, 张勇, 孙凌, 丁雷, 黄小仙. FY-3A中分辨率光谱成像仪热红外通道的多探元辐射定标[J]. 光学精密工程, 2010,18(9): 1972-1980

HU Xiu-qing, ZHANG Li-yang, ZHENG Zhao-jun, ZHANG Yong, SUN Ling, DING Lei, HUANG Xiao-xian. FY-3A multi-detector radiometric calibration for infrared band of medium resolution spectral imager[J]. 光学精密工程, 2010,18(9): 1972-1980
胡秀清, 张里阳, 郑照军, 张勇, 孙凌, 丁雷, 黄小仙. FY-3A中分辨率光谱成像仪热红外通道的多探元辐射定标[J]. 光学精密工程, 2010,18(9): 1972-1980 DOI： 10.3788/OPE.20101809.1972.

HU Xiu-qing, ZHANG Li-yang, ZHENG Zhao-jun, ZHANG Yong, SUN Ling, DING Lei, HUANG Xiao-xian. FY-3A multi-detector radiometric calibration for infrared band of medium resolution spectral imager[J]. 光学精密工程, 2010,18(9): 1972-1980 DOI： 10.3788/OPE.20101809.1972.

摘要

FY-3A中分辨率光谱成像仪(MERSI)红外通道采取40探元跨轨并行扫描方式

针对其辐射定标要比传统单元探测器的辐射定标复杂的问题

研究了MERSI红外通道的多探元辐射定标方法。首先

基于星上黑体观测进行逐探元的辐射定标处理

消除探元辐射响应差异条纹;然后

利用各探元与基准探元光谱响应对不同温度黑体光谱辐亮度建立比值关系

基于其随着辐亮度呈非线性变化的关系

对逐探元定标后图像进行探元光谱差异的辐亮度归一化补偿

从辐射机理上最大限度地消除图像条纹

实现了多探元观测目标辐射信号的光谱响应差异归一化。为了验证MERSI红外通道辐射定标精度

文中还利用同时过星下点观测(SNO)交叉定标方法

将MERSI定标结果与美国Terra中分辨率成像光谱仪(MODIS)定标结果进行比对

结果显示

相对于后者

MERSI的红外通道亮温高1 K左右

认为这可能与两者的通道带宽不同有关。

Abstract

As the FY-3A Medium Resolution Spectral Imager(MERSI) takes a cross-track scanning by 40 detectors in a thermal Infrared Window band

its radiometric calibration is more complicate than those of traditional single detectors. Therefore

this paper investigates a multi-detector radiometric calibration method for the MERSI. Firstly

the operational calibration algorithm for the IR band of MERSI based on onboard blackbody detector-by-detector is proposed to eliminate the radiometric response difference strips.Then

based on the radiance ratios of each detector to reference detector at different blackbody temperatures

this algorithm conducts the normalization processing for SRF-different bias (spectral normalization)to alleviate the image strips by radiometric mechanism. To verify the accuracy of MERSI calibration

the inter-calibration between MERSI and Moderate-resolution Imaging Spectroradiometer(MODIS) is performed by using Simultaneous Nadir Observation (SNO).Experiments show that the difference of their brightness temperatures is about 1.0 K

which may come from their different bandwidths.

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Keywords

references

杨军,董超华,卢乃锰,等. 中国新一代极轨气象卫星风云三号

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Related Author

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Related Institution

Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences

University of Chinese Academy of Sciences

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