基于青海湖辐射校正场的FY3D/MERSI-Ⅱ卫星遥感器热红外波段在轨辐射定标  

On-orbit Radiometric Calibration for Thermal Infrared Band of FY3D/MERSI-Ⅱ Satellite Remote Sensor Based on Qinghai Lake Radiation Calibration Test-site

作　　者：张允祥 李新[1] 张孟 康晴[1] 韦玮[1] 郑小兵 张勇[3,4] ZHANG Yun-xiang;LI Xin;ZHANG Meng;KANG Qing;WEI wei;ZHENG Xiao-bing;ZHANG Yong(Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;National Satellite Meteorological Center,China Meteorological Administration,Beijing 100081,China;Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,China Meteorological Administration,Beijing 100081,China)

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院通用光学定标与表征技术重点实验室,合肥230031 [2]中国科学技术大学,合肥230026 [3]中国气象局国家卫星气象中心,北京100081 [4]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,北京100081

出　　处：《光子学报》2020年第5期128-136,共9页Acta Photonica Sinica

基　　金：民用航天技术预先研究项目(No.D040401)。

摘　　要：2018年8月在青海湖辐射校正场开展了针对FY3D/MERSI-Ⅱ卫星遥感器热红外通道的在轨绝对辐射定标试验.采用走航式测量的方式获取了青海湖水表光谱辐亮度数据,结合探空数据,并基于辐射传输模型计算出卫星过境时刻的入瞳辐亮度和亮温,实现了对FY3D/MERSI-Ⅱ卫星遥感器热红外通道24(10.26~11.26μm)和通道25(11.50~12.50μm)的在轨辐射定标.利用国际公认精度的AQUA/MODIS和NPP/VⅡRS卫星遥感器对在轨辐射定标方法进行精度评估,在10.26~11.26μm和11.50~12.50μm波段范围,通道亮温的平均偏差分别小于0.5K和1.0K,表明基于青海湖辐射定标场的在轨辐射定标方法具有较好的定标精度,获得的定标结果合理可靠.将利用青海湖进行的在轨定标结果与星上定标结果进行比较,在10.26~11.26μm和11.50~12.50μm波段范围,通道亮温的平均偏差分别小于0.5K和1.25K,表明FY3D/MERSI-Ⅱ在轨运行稳定.本次试验检验了FY3D/MERSI-Ⅱ星上定标结果,也为FY3D/MERSI-Ⅱ遥感数据的定量化应用提供了保障.In August 2018,an on-orbit absolute radiometric calibration test for the thermal infrared channel of FY3 D/MERSI-Ⅱ satellite remote sensor was carried out at the Qinghai lake radiation correction test-site.The spectral radiance data of Qinghai Lake was obtained by means of fixed-point measurement.The sounding data were input to radioactive transfer model to compute the at-sensor radiance and brightness temperature of the satellite,and the calibration coefficients for thermal infrared channel 24(10.26~11.26μm)and channel 25(11.50~12.50μm)of FY3 D/MERSI-Ⅱ were calculated.AQUA/MODIS and NPP/VⅡRS satellite remote sensors which have high calibration accuracy were used to evaluate the accuracy of the on-orbit radiometric calibration method.The average deviation of the channel brightness temperature is less than 0.5 Kin the range of 10.26~11.26μm and less than 1.0 Kin the range of 11.50~12.50μm,indicating that the on-orbit radiometric calibration method has better calibration accuracy,and the calibration results are reasonable and reliable.Comparing the on-orbit calibration results using the Qinghai Lake with the on-board calibration results,in the range of 10.26~11.26μm and 11.50~12.50μm,the average deviation of the channel brightness temperature is less than0.5 Kand 1.25 K,respectively.It shows that FY3 D/MERSI-Ⅱ runs stably on orbit.This test verified the FY3 D/MERSI-Ⅱ on-board calibration results,and provided a guarantee for the quantitative application of FY3 D/MERSI-Ⅱ remote sensing data.

关 键 词：遥感 绝对定标 精度分析 热红外 辐射传输 

分 类 号：O436[机械工程—光学工程]