利用青海湖对FY-1C、FY-2B气象卫星热红外通道进行在轨辐射定标  

IN-FLIGHT RADIOMETRIC CALIBRATION FOR THERMAL CHANNELS OF FY-1C AND FY-2B METEOROLOGICAL SATELLITE SENSORS USING QINGHAI LAKE

作　　者：胡秀清[1] 戎志国[1] 邱康睦[1] 张玉香[1] 张广顺[1] 黄意玢[1] 

机构地区：[1]国家卫星气象中心,北京100081

出　　处：《空间科学学报》2001年第4期370-380,共11页Chinese Journal of Space Science

基　　金：重点卫星应用项目中国遥感卫星辐射校正场资助(Y96#08-01-04)

摘　　要：介绍利用青海湖水面辐射校正场对ＦＹ－１Ｃ、ＦＹ２Ｂ气象卫星热红外通道进行在轨辐射 定标．先用ＣＥ３１２野外热红外辐射计在水面测量水表辐亮度，再经大气订正传递到卫星入 瞳处，大气订正包括大气吸收削弱和大气产生热发射影响，这两部分对卫星信号的贡献通过 辐射传输模式ＭＯＤＴＲＡＮ３７计算出来．同时进行ＣＥ３１２与卫星通道光谱响应匹配，最终 得到卫星入瞳处的表观辐亮度．这个辐亮度与卫星通道的计数值得到该通道绝对定标系数． 我们对两颗卫星进行了多次定标，结果表明利用青海湖进行的在轨定标与星上定标系数相差 ５％左右，相当于３Ｋ的亮温差．This Paper describe the in-flight radiometric calibration for thermal channels of FY-1C and FY-2B meteorological satellite sensors using Qinghai lake, water surface radiometric calibration site. The radiance of water surface measured by CE312, and then performed atmosphere correct including gas absorption and path radiance which computed by radiance transfer code MODTRAN37, predict the radiance in the satellite sensor entrance pupil. At the same time the spectral response of Satellite sensor and that of ground-based sensor are coupled. At last the apparent radiance of sensor spectral channels are compared to the digital count of satellite's output to give the calibration coefficient. Several calibration is conducted for the satellite thermal sensors of FY serial satellites. The result show the difference between in-flight and on-board calibration is about 5%, equivalent to a brightness temperature of 3 K.

关 键 词：光谱响应匹配 辐射传辅计算 入瞳处辐亮度 FY-1C气象卫星 FY-2B气象卫星 热红外通道 在轨辐射定标 

分 类 号：P414[天文地球—大气科学及气象学]