戎志国,张玉香 ,陆风,许健民 ,邱康睦. 2005. FY-2B与NOAA卫星红外通道的相对定标[J]. 气象学报, 63(4):485-492, doi:10.11676/qxxb2005.048
FY-2B与NOAA卫星红外通道的相对定标
INTER CALIBRATION OF FY-2B IR CHANNEL WITH NOAA SATELLITES
投稿时间:2003-11-04  修订日期:2004-04-26
DOI:10.11676/qxxb2005.048
中文关键词:  相对定标,GAC资料,光谱匹配,定标查找表
英文关键词:Inter calibration, GAC data, Spectral matching, Lookup table of calibration.
基金项目:FY-2(02批)卫星工程地面应用系统预报研究项目
作者单位
戎志国 国家卫星气象中心 北京 100081 
张玉香 国家卫星气象中心 北京 100081 
陆风 国家卫星气象中心 北京 100081 
许健民 国家卫星气象中心 北京 100081 
邱康睦 国家卫星气象中心 北京 100081 
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中文摘要:
      FY-2是自旋扫描静止气象卫星,其红外通道的在轨定标是将黑体从后光路插入目标光路中进行的,此种定标不是全光路定标,存在较大的误差。为了获得较好的红外通道在轨定标系数,用定标精度较高的NOAA(16,17)卫星通道4观测数据与FY-2B红外通道观测数据进行 了相对定标试验。相对定标的工作主要是两种卫星观测仪器响应函数之间的光谱匹配和观测 图像之间的几何匹配。拟合匹配后两种卫星的观测数据,利用NOAA卫星较高精度的定标系数 可得到改进的FY-2B定标系数。FY-2B相对定标系数的精度比原定标系数有较大的提高。
英文摘要:
      FY-2 is a spin scanning geostationary meteorological satellite. The calibration of IR channel in -orbit was to insert a blackbody into objective optical path from back end optical path. There was a big error for such calibration, but tha twasn't a total optic path calibration. For the infrared channels, the pre-launch calibration was conducted in a vacuum container used to simulate the space environment. The instrument was calibrated with reference to the black body. The radiant cooler was keeping at two tempera tures states, i.e. 95 K,100 K in the laboratory. The objective blackbody vari ed with a series of the temperatures. Then the infrared sensors were measured in variety combined temperatures conditions of the primary mirror and second mirror. The sensors output voltages with response were also measured. But, the char acteristic response of sensors was varying by time after the satellite launched. The pre-calibration was no longer useful. Thus the calibration post launch wa s very importance. There were a variety of calibration methods post-launch about the black-body calibration, the calibration of the radiometric calibrated sit es, the calibration of radiant numeric data and the inter calibration with diff erent satellites. The 27 th CGMS meeting in 1999 stressed the importance of inter -calibration.  In CMA/NSMC, the inter-calibration study is carried out and is operation orien ted. The inter calibration uses NOAA satellite data to calibrate FY-2 geostati onary satellite. The data were used for calibrating FY-2 long wave IR channel. The inter-calibration examination was processed by the GAC data of AVHRR channe l4 from NOAA 16, 17 that were high precision calibration. The inter calibrati on jobs were mainly the spectral matching between two response functions of sate llites measured sensors and the geometry matching between two images observed. T he calibration coefficient of FY-2B was ameliorated by the better calibration coefficient of NOAA satellites after matching two satellites data were calculated . The inter-calibration precision of FY-2B IR channel was highly enhanced.
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