GF5B热红外通道星上定标与验证  

On-board calibration and verification of GF5B thermal infrared channel

作　　者：马秀秀 王海燕[1,2] 韩启金 张学文[1,2] 赵航 徐兆鹏[1,2] 曾健 马灵玲[3] 王宁 Ma Xiuxiu;Wang Haiyan;Han Qijin;Zhang Xuewen;Zhao Hang;Xu Zhaopeng;Zeng Jian;Ma Lingling;Wang Ning(China Center for Resources Satellite Data and Application,Beijing 100094,China;China Siwei Surveying and Mapping Technology Co.Ltd.,Beijing 100094,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国资源卫星应用中心,北京100094 [2]中国四维测绘技术有限公司,北京100094 [3]中国科学院空天信息创新研究院,北京100094

出　　处：《红外与激光工程》2023年第4期21-31,共11页Infrared and Laser Engineering

基　　金：国家重点研发计划(2019YFE0127300);中国科学院战略性先导科技专项(XDA26010201-3)。

摘　　要：以GF5B卫星发射前实验室定标为基础,采用星上0级黑体定标数据,建立了适用于GF5B热红外通道的星上绝对辐射定标模型。通过对2022年01月12日星上黑体定标数据进行处理,获得成像仪热红外通道的绝对辐射定标系数。对星上定标系统精度进行分析,并采用地面同步烟台浮标数据对定标结果进行精度验证,结果表明,在轨后星上定标系统的绝对定标精度为0.9 K;星地验证结果显示B11和B12通道亮温的偏差分别为0.33、0.77 K。说明基于星上黑体的定标方法具有较好的精度,定标结果可靠,可满足遥感数据定量化应用的需要,为实时准确获取热红外通道定标系数提供了方法借鉴。Objective Thermal infrared remote sensing has the ability of day and night detection and good environmental adaptability,which makes it have important applications in natural ecological environment monitoring,urban heat island effect monitoring,lake and reservoir water quality monitoring,etc.The application of thermal infrared remote sensing has gradually changed from qualitative to quantitative,and absolute radiometric calibration is the prerequisite for the quantification of remote sensing information.Among them,on-board blackbody calibration uses on-board blackbody as the calibration source,which is not limited by time,environment and other factors.It can produce corresponding calibration coefficients for each orbit data,improve the frequency of on-orbit absolute radiometric calibration.Based on the on-board 0-level blackbody calibration data of GF5B VIMI(Hyperspectral observation satellite,visible and infrared multispectral image),the absolute radiometric calibration research of satellite thermal infrared channel is carried out.In this way,reliable calibration results can be obtained to provide a method basis for the subsequent blackbody calibration of satellite thermal infrared remote sensing.Methods Based on the laboratory calibration before the launch of GF5B satellite,the on-board blackbody calibration data is used to establish the on-board absolute radiometric calibration model applicable to the GF5B thermal infrared channel.Firstly,relative radiometric correction is carried out for the high and low temperature blackbody image data transmitted from satellite;based on the blackbody image data after relative radiation correction,the average DN of each channel corresponding to the high and low temperature blackbody is obtained.At the same time,the high and low blackbody temperature is calculated based on the high and low temperature blackbody auxiliary data,and then the radiance value of the corresponding channel of the high and low temperature blackbody is calculated using the Planck function.Then,accordin

关 键 词：GF5B 全谱段光谱成像仪 黑体 在轨辐射定标 验证 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] TP732.2[自动化与计算机技术—控制科学与工程]