红外与毫米波学报, 2019, 38 (5): 648, 网络出版: 2019-11-19  

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

Post-launch calibration and validation of the Geostationary Interferometric Infrared Sounder(GIIRS)on FY-4A
作者单位
1 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
2 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
3 国家卫星气象中心,北京 100081
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 1K,优于设计指标.
Abstract
The Geostationary Interferometric Infrared Sounder(GIIRS)on board FY-4A is an infrared Fourier transform spectrometer. The primary use ofGIIRSis to support numerical weather predictions byprovidingimprovedtemperature and watervaporprofileinformation,whichrequires high radiomet-ric precision and accuracy. To meet the requirement,post-launch GIIRS calibration and validation ac-tivities were carried out. The spectral calibration has been done throughdeterminingthe effective sam-pling 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 maybe causedby some materials gradually releasing alittle gas. The estimated absolute spectral calibration uncertaintyis 10ppm,and the mean brightness temperature differences between GIIRS observations and IASI observations are all less than 1 K in the long-wave andmid-waveband.

冯绚, 李利兵, 陈博洋, 邹曜璞, 韩昌佩. 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[J]. 红外与毫米波学报, 2019, 38(5): 648. FENG Xuan, LI Li-Bing, CHEN Bo-Yang, ZOU Yao-Pu, HAN Chang-Pei. Post-launch calibration and validation of the Geostationary Interferometric Infrared Sounder(GIIRS)on FY-4A[J]. Journal of Infrared and Millimeter Waves, 2019, 38(5): 648.

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