Articles | Volume 17, issue 15
https://doi.org/10.5194/amt-17-4613-2024
https://doi.org/10.5194/amt-17-4613-2024
Research article
 | 
09 Aug 2024
Research article |  | 09 Aug 2024

A new non-linearity correction method for the spectrum from the Geostationary Inferometric Infrared Sounder on board Fengyun-4 satellites and its preliminary assessments

Qiang Guo, Yuning Liu, Xin Wang, and Wen Hui

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This preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).
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Cited articles

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Datla, R., Shao, X., Cao, C., and Wu, X.: Comparison of the calibration algorithms and SI traceability of MODIS, VIIRS, GOES, and GOES-R ABI sensors, Remote Sens., 8, 126, https://doi.org/10.3390/rs8020126, 2016. 
Guo, Q. and Feng, X.: In-orbit spectral response function correction and its impact on operational calibration for the long-wave split-window infrared band (12.0 ìm) of FY-2G satellite, Remote Sens., 9, 553, https://doi.org/10.3390/rs9060553, 2017. 
Guo, Q., Chen, F., Li, X., Chen, B., Wang, X., Chen, G., and Wei, C.: High-accuracy source-independent radiometric calibration with low complexity for infrared photonic sensors, Light: Science Appl., 10, 163, https://doi.org/10.1038/s41377-021-00597-4, 2021a. 
Guo, Q., Yang, J., Wei, C., Chen, B., Wang, X., Han, C., Hui, W., Xu, W., Wen, R., and Liu, Y.: Spectrum calibration of the first hyperspectral infrared measurements from a geostationary platform: Method and preliminary assessment, Q. J. Roy. Meteorol. Soc., 147, 1562–1583, https://doi.org/10.1002/qj.3981, 2021b. 
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Short summary
Non-linearity (NL) correction is a critical procedure to guarantee that the calibration accuracy of a spaceborne sensor approaches a reasonable level. Different from the classical method, a new NL correction method for a spaceborne Fourier transform spectrometer is proposed. To overcome the inaccurate linear coefficient from two-point calibration influencing NL correction, an iteration algorithm is established that is suitable for NL correction of both infrared and microwave sensors.
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