风云四号A星干涉式大气垂直探测仪在轨定标及性能评价
投稿时间:2019-03-29  修订日期:2019-07-23  点此下载全文
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作者单位E-mail
冯绚 中国科学院空间应用工程与技术中心太空应用重点实验室,北京 100094 fengxuan@csu.ac.cn 
李利兵 中国科学院上海技术物理研究所中国科学院红外探测与成像重点实验室,上海 200083  
陈博洋 国家卫星气象中心北京 100086  
邹曜璞 中国科学院上海技术物理研究所中国科学院红外探测与成像重点实验室,上海 200083  
韩昌佩 中国科学院上海技术物理研究所中国科学院红外探测与成像重点实验室,上海 200083  
基金项目:中国科学院红外探测与成像技术重点实验室开放课题基金资助项目
中文摘要:干涉式大气垂直探测仪(GIIRS)是风云四号A星(FY-4A)的三大主载荷之一,其主要功能是实现大气温度和湿度参数的垂直结构观测。为了满足卫星数据定量化应用的要求,FY-4A星成功发射之后,围绕GIIRS开展了一系列的在轨定标和性能评价工作。评价结果表明:除部分通道受到有机挥发物的影响,85%的通道灵敏度优于设计指标;利用大气辐射传输模式,通过比较观测光谱与模拟光谱的均方根误差来确定激光有效采样频率,实现了GIIRS在轨光谱定标,精度达到10 ppm;利用星上面源黑体,考虑到非理想干涉图的相位影响,采用改进后的两点式外黑体定标法,实现了星上在轨辐射定标,长波和中波的平均亮温偏差均小于1 K,优于设计指标。
中文关键词:风云四号卫星  干涉式大气垂直探测仪  在轨定标  性能评价
 
Post-launch calibration and validation of the Geostationary Interferometric Infrared Sounder (GIIRS) on FY-4A
Abstract:The Geostationary Interferometric Infrared Sounder (GIIRS) on board FY-4A is an infrared Fourier transform spectrometer. The primary use of GIIRS is to support numerical weather predictions by providing improved temperature and water vapor profile information, which requires high radiometric precision and accuracy. To meet the requirement, post-launch GIIRS calibration and validation activities were carried out. The spectral calibration has been done through determining the effective sampling frequency which is to take advantage of gaseous line center positions known to high accuracy. The radiometric calibration has been performed through using observation of hot and cold black body reference sources as the basis for two-point calibrations at each wavenumber. The amplitude of some spectrum bands was reduced, which may be caused by some materials gradually releasing a little gas. The estimated absolute spectral calibration uncertainty is 10 ppm, and the mean brightness temperature differences between GIIRS observations and IASI observations are all less than 1 K in the long-wave and mid-wave band.
keywords:FY-4 meteorological satellite  Geostationary Interferometric Infrared Sounder (GIIRS)  calibration  validation
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