FY-2B热红外通道星上实时绝对辐射定标  

On-board real-time absolute radiometric calibration for thermal infrared band of FY-2B

作　　者：童进军[1] 戎志国[1] 邱康睦[1] 许健民[1] 

机构地区：[1]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

出　　处：《红外与激光工程》2007年第4期467-471,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金资助项目(40675059);国防科工委卫星应用研究资助项目(GF2002-辐射)

摘　　要：选取了2002年6月24日到8月30日00、06、12、18(世界时)的FY-2B卫星云图,获取这段时间青海湖晴空时的图像共34次,并获取其卫星计数值。利用青海湖自动浮标系统测得的水表温度和NCEP再分析资料的大气廓线,利用MODTRAN3.7计算大气层顶辐亮度和亮温,获得FY-2B热红外通道绝对辐射定标系数,从而计算等效黑体温度。同时获取对应时刻的星上黑体温度、计数值以及星上环境温度。据此建立等效黑体温度和星上黑体温度的转换关系,实现静止气象卫星热红外通道星上实时绝对辐射定标。There are 34 cloud-free images,achieved by FY-2B, of Qinghai Lake at the 00, 06, 12, 18 GMT from June 24th, 2002 to August 30th, 2002. The corresponding digital counts are extracted. The MODTRAN3.7 is used to calculate the top of atmosphere radiance and brightness temperature using the water surface temperatures measured by auto hydrometeorological buoy system in Qinghai Lake and atmospheric profiles of NCEP reanalyzed data. Then, the absolute calibration coefficients of FY-2B thermal infrared channels are achieved by comparing the TOA radiance and brightness temperature with the digital counts. At the same time, the corresponding black body temperatures, digital counts and the temperatures of major mirror, refractor mirror, secondary mirror and calibration mirror are detected. According to the above data, the transform equation from temperature of on-board black body to that of equivalent black body is established. Finally, the on-board real-time absolute radiometric calibration for thermal infrared band of geostationary meteorology satellite can be realized.

关 键 词：自动浮标系统 NCEP 热红外通道 星上绝对辐射定标 

分 类 号：TP732.2[自动化与计算机技术—检测技术与自动化装置]