红外傅里叶光谱仪在轨光谱定标算法研究
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摘要
风云四号A星上搭载的干涉式大气垂直探测仪的核心是一台红外傅里叶光谱仪,为了提高探测仪观测资料的定量化应用水平,必须对其进行精确的在轨光谱定标。对于傅里叶光谱仪来说,光谱位置由干涉图的采样点数和参考激光频率共同决定,因此光谱定标的关键是确保参考激光频率的稳定性。本研究利用逐线积分辐射传输模式得到参考大气吸收谱线,通过比较探测仪观测光谱与参考光谱的均方根误差来确定激光的有效采样频率,从而实现探测仪的在轨高精度光谱定标。该方法已应用于风云四号A星上搭载的干涉式大气垂直探测仪的在轨光谱定标中,具有较高的应用价值。
The geostationary interferometric infrared sounder(GIIRS) on-board FY-4 A satellite is an infrared Fourier transform spectrometer. To improve the quantitative application level of observed data, it is necessary to conduct the on-orbit spectral calibration of the GIIRS accurately. Since the spectral positions are determined by the reference laser frequency and the number of the sampling points collected from interferograms for the Fourier transform spectrometer, the key of the spectral calibration is to ensure the stability of the reference laser frequency. In this study, a line-by-line radiative transfer model(LBLRTM) is used to calculate the reference atmospheric absorption spectra. The effective sampling frequency of the laser is determined empirically by comparing the root-mean-square error between the observed and the reference spectra of the detector, achieving the on-orbit high-precision spectral calibration of the detector. This method is used for the on-orbit spectral calibration of the GIIRS on-board FY-4 A satellite, clearly demonstrating its application value.
The geostationary interferometric infrared sounder(GIIRS) on-board FY-4 A satellite is an infrared Fourier transform spectrometer. To improve the quantitative application level of observed data, it is necessary to conduct the on-orbit spectral calibration of the GIIRS accurately. Since the spectral positions are determined by the reference laser frequency and the number of the sampling points collected from interferograms for the Fourier transform spectrometer, the key of the spectral calibration is to ensure the stability of the reference laser frequency. In this study, a line-by-line radiative transfer model(LBLRTM) is used to calculate the reference atmospheric absorption spectra. The effective sampling frequency of the laser is determined empirically by comparing the root-mean-square error between the observed and the reference spectra of the detector, achieving the on-orbit high-precision spectral calibration of the detector. This method is used for the on-orbit spectral calibration of the GIIRS on-board FY-4 A satellite, clearly demonstrating its application value.
引文
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[2] Feng X,Guo Q,Han C P,et al.Correction method of zero path difference position[J].Journal of Infrared and Millimeter Waves,2017,36(6):795-798,804.冯绚,郭强,韩昌佩,等.干涉图零光程差位置的确定方法[J].红外与毫米波学报,2017,36(6):795-798,804.
[3] Chen H Y,Zhang L M,Li X,et al.Hyperspectral sensor in flight spectral calibration based on characteristic spectra of atmosphere[J].Acta Optica Sinica,2013,33(5):0528003.陈洪耀,张黎明,李鑫,等.高光谱遥感器飞行中基于大气特征谱线的光谱定标技术[J].光学学报,2013,33(5):0528003.
[4] Li Z W,Xiong W,Shi H L,et al.Study on laboratory calibration of spatial heterodyne spectrometer[J].Acta Optica Sinica,2014,34(4):0430002.李志伟,熊伟,施海亮,等.空间外差光谱仪实验室定标技术研究[J].光学学报,2014,34(4):0430002.
[5] Aumann H H,Gregorich D,Gaiser S,et al.AIRS algorithm theoretical basis document:level 1B part 1:infrared spectrometer[R].[S.l.:s.n.],2000:12-14.
[6] Tong Q X,Zhang B,Zheng F L.Hyperspectral remote sensing[J].Beijing:Higher Education Press,2006:68-70.童庆禧,张兵,郑兰芬.高光谱遥感[M].北京:高等教育出版社,2006:68-70.
[7] Liu P,Wang P G,Hua J W,et al.Spectral calibration and ILS measurement of Fourier transform spectrometer[J].Science Technology and Engineering,2007,7(17):4408-4411.刘鹏,王培纲,华建文,等.傅里叶光谱仪光谱定标及仪器线性函数测定[J].科学技术与工程,2007,7(17):4408-4411.
[8] Wang W G.Interferometer spectrometer[M].Beijing:China Astronautic Publishing House,1988:197-200.王文桂.干涉光谱仪[M].北京:中国宇航出版社,1988:197-200.
[9] Blumstein D,Chalon G,Carlier T,et al.IASI instrument:technical overview and measured performances[J].Proceedings of SPIE,2004,5543:196-207.
[10] Tsugawa R,Xia L M,De G G,et al.Joint polar satellite system(JPSS) cross track infrared sounder (CrIS) sensor data records (SDR) algorithm theoretical basis document (ATBD) for normal spectral resolution[R].Washington D.C.:NOAA,2009:42-45.
[11] Knuteson R.Algorithm theoretical basis document for the geostationary imaging Fourier transform spectrometer(GIFTS) Level 0-1 ground data processing[M].Madison:University of Wisconsin-Madison,2006:37-40.
[12] Clough S A,Shephard M W,Mlawer E J,et al.Atmospheric radiative transfer modeling:a summary of the AER codes[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2005,91(2):233-244.
[13] Feng X,Zhao F S,Gao W H.Effect of the improvement of the HITRAN database on the radiative transfer calculation[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2007,108(2):308-318.
[14] Zhou S C.Introduction to advanced infrared optical-electronics engineering[M].Beijing:Science Press,2014:309-317.周世椿.高级红外光电工程导论[M].北京:科学出版社,2014:309-317.
[15] Griffiths P R,de Haseth J A.Fourier transform infrared spectrometry[M].Hoboken,NJ,USA:John Wiley & Sons,Inc.,2007:19-27.
[16] Zou Y P,Zhang L,Han C P,et al.Study of high accuracy spectral calibration of Fourier transform spectrometer[J].Spectroscopy and Spectral Analysis,2018,38(4):1268-1275.邹曜璞,张磊,韩昌佩,等.傅里叶光谱仪高精度光谱定标研究[J].光谱学与光谱分析,2018,38(4):1268-1275.
[17] Knuteson R O,Revercomb H E,Best F A,et al.Atmospheric emitted radiance interferometer:part II:instrument performance[J].Journal of Atmospheric and Oceanic Technology,2004,21(12):1777-1789.
[18] Liu P.Spectral calibration of Fourier transform spectrometer[D].Shanghai:University of Chinese Academy of Sciences,2007:30-31.刘鹏.干涉式大气垂直探测仪光谱定标方案研究[D].上海:中国科学院大学,2007:30-31.
[19] Best F A,Revercomb H E,Bingham G E,et al.Calibration of the geostationary imaging Fourier transform spectrometer (GIFTS)[J].2001,4151:21-30.
[20] Tobin D C,Revercomb H E,Knuteson R O.On-orbit spectral calibration of the geosynchronous imaging Fourier transform spectrometer (GIFTS)[R].[S.l.]:CALCON,2003.
[21] Goody R M,Yung Y L.Atmospheric radiation:theoretical basis[M].Oxford:Oxford University Press,1989:6-11.
[22] Worden H M,Bowman K W.Tropospheric emission spectrometer (TES) level 1B algorithm theoretical basis document[R].[S.l.:s.n.],1999.
[23] Wu X Q,Hewison T,Tahara Y.GSICS GEO-LEO intercalibration:baseline algorithm and early results[[J].Proceeding of SPIE,2009,7456:745604.