风云四号B星干涉式红外探测仪发射前辐射定标  

Pre-Launch Radiometric Calibration of Geostationary Interferometric Infrared Sounder on FengYun-4B Satellite

作　　者：李路 倪卓娅 漆成莉[1] 杨磊[1] 韩昌佩[2] Li Lu;Ni Zhuoya;Qi Chengli;Yang Lei;Han Changpei(National Satellite Meteorological Center,Beijing 100081,China;Key Laboratory of Infrared System Detection and Imaging Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]国家卫星气象中心,北京100081 [2]中国科学院上海技术物理研究所红外探测与成像重点实验室,上海200083

出　　处：《光学学报》2022年第6期264-277,共14页Acta Optica Sinica

基　　金：中国气象局风云卫星应用先行计划(FY-APP-2021.0507)。

摘　　要：干涉式红外探测仪(GIIRS)是我国地球静止轨道气象卫星风云四号B星的主要载荷,可观测大气上行红外高光谱辐射,因此可应用于大气温湿度廓线反演和数值天气预报模型同化。为了预测GIIRS在发射后的工作性能,于发射前在地面试验室热真空环境中采用黑体定标试验的方法,对仪器辐射性能进行了测试,测试的性能包括仪器灵敏度、辐射定标精度和动态观测范围。其中,长波红外通道的噪声等效辐射方差低于0.5 mW/(m^(2)·sr·cm^(-1)),中波红外通道的噪声等效辐射方差低于0.1 mW/(m^(2)·sr·cm^(-1)),两者均达到灵敏度设计指标。在辐射定标方面,经过非线性校正,长波光谱的平均定标偏差从1 K减小到0.2 K,且在220~315 K观测范围内达到0.7 K的设计指标;仪器在中波通道观测低温目标时受噪声影响较大,但在260~315 K的动态范围内,定标偏差也能够达到0.7 K的指标要求。The geostationary interferometric infrared sounder(GIIRS)is a key payload on the geostationary FengYun-4B meteorological satellite of China.Because the GIIRS can measure atmospheric upwelling hyperspectral infrared radiance,it can be used to retrieve atmospheric temperature and humidity profiles and can also be applied to numerical weather prediction models.For the prediction of GIIRS’post-launch performance,a series of blackbody calibration experiments are performed before launch in a laboratory thermal vacuum tank in a ground laboratory to test the radiometric performances of the instrument,including sounder sensitivity,radiometric calibration accuracy,and dynamic observation range.The noise equivalent differential radiance(NEdR)in the long-wave infrared(LWIR)band is less than 0.5 mW/(m^(2)·sr·cm^(-1)),and that in the mid-wave infrared(MWIR)band is less than 0.1 mW/(m^(2)·sr·cm^(-1)).Both NEdRs meet the sensitivity design requirements.As for the radiometric calibration,the average calibration difference in the LWIR band is improved from 1 K to 0.2 K after the nonlinearity correction.In addition,in the observation range of 220-315 K,the calibration differences meet the design requirement of 0.7 K.The MWIR band is susceptible to noise when the instrument is used to observe low-temperature targets.Nevertheless,the calibration differences also meet the 0.7 K index requirement in the dynamic range of 260-315 K.

关 键 词：光谱学 傅里叶变换光谱学 静止轨道气象卫星 红外高光谱 辐射定标 仪器灵敏度 非线性校正 

分 类 号：P414.4[天文地球—大气科学及气象学]