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Spectrum calibration of the first hyperspectral infrared measurements from a geostationary platform: Method and preliminary assessment
Quarterly Journal of the Royal Meteorological Society ( IF 8.9 ) Pub Date : 2021-01-20 , DOI: 10.1002/qj.3981
Qiang Guo 1 , Jun Yang 1 , Caiying Wei 1 , Boyang Chen 1 , Xin Wang 1 , Changpei Han 2 , Wen Hui 1 , Weiwei Xu 1 , Rui Wen 3 , Yuning Liu 3
Affiliation  

The level‐1 (L1) radiance spectra from the first Geostationary Interferometric InfraRed Sounder (GIIRS) have been publicly available since January 2019. On account of the inherent observation characteristics, operation modes, and capabilities, a complete spectrum calibration method of GIIRS/L1 products is originally proposed to form the latest version (V3) algorithm for implementation. Particularly, four targeted improvements in three aspects are independently established: subsample location alignment to yield integrated interferograms in both forward and backward directions with almost zero phase, rough spectral scale unification as well as accurate spectral scale correction to resolve spectral non‐uniformity due to a seriously asymmetric configuration of focal plane array, and an additional double‐reflected compensation to mitigate the influence of non‐ideal onboard blackbody reference upon radiometric accuracy. Preliminary assessments from both domestic and international sources indicate that the spectral and radiometric accuracies of the measured spectra from the latest GIIRS/L1 V3 algorithm show a well‐behaved performance in both longwave (LW) and midwave (MW) bands, that is, lower than 10 ppm of spectral scale errors, which is of sufficient accuracy for numerical weather prediction use, and around 1 K for most uncontaminated channels within the LW band. However, non‐linearity correction of interferograms and spectral quality improvements, especially for the MW band, should be developed further. In general, a feasible solution of spectrum calibration for a hyperspectral sounder on geostationary platform is provided in detail for reference, which is expected to benefit users of GIIRS data as well as designers responsible for L1 data processing of other similar sensors.

中文翻译:

对地静止平台首次高光谱红外测量的光谱校准:方法和初步评估

自2019年1月以来,第一台地球静止干涉红外测深仪(GIIRS)的1级(L1)辐射光谱已公开可用。由于固有的观测特性,操作模式和功能,GIIRS / L1的完整光谱校准方法产品最初是为了形成最新版本(V3)算法而提出的。特别是,在三个方面分别建立了四个有针对性的改进:子样本位置对齐,以产生几乎为零相位的正向和反向正向干涉图,粗糙的光谱尺度统一以及精确的光谱尺度校正,以解决由于光谱误差引起的光谱不均匀性。焦平面阵列的严重不对称配置,以及额外的双反射补偿,以减轻非理想的车载黑体基准对辐射测量精度的影响。来自国内外的初步评估表明,最新GIIRS / L1 V3算法测得的光谱的光谱和辐射精确度在长波(LW)和中波(MW)波段均表现出良好的性能,即较低频谱比例误差小于10 ppm,这对于数值天气预报的使用具有足够的准确性,而LW频段内大多数未污染的信道约为1K。但是,应进一步开发干涉图的非线性校正和频谱质量的改善,尤其是对于MW波段。一般来说,
更新日期:2021-01-20
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