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Home > Archive>Volume 40, Issue 2, 2021 >214-222. DOI:10.11972/j.issn.1001-9014.2021.02.012
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High precision on-orbit spectral calibration of atmospheric infrared ultra-spectral sounder
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Affiliation:

1.Key Laboratory of Optical Calibration and Characterization， Anhui Institute of Optics and Fine Mechanics， Chinese Academy of Sciences， Hefei 230031， China;2.China Centre for Resources Satellite Data and Application， Beijing 100094， China;3.Beijing Institute of remote sensing information， Beijing 100085， China;4.University of Science and Technology of China， Hefei 230026， China

Clc Number:

TP732.2

Fund Project:

Supported by National Natural Science Foundation of China (41601379)

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    Abstract:

    The atmospheric infrared ultra-spectral sounder （AIUS） is one of the main loads of GF-5 satellite. It is used to obtain the vertical distribution information of various atmospheric trace gases through solar occultation observation. And accurate spectral calibration is the key and foundation for its data quantitative inversion. Ultra-spectral resolution and no matching on-board spectral calibration equipment make it is difficult to realize high precision on-orbit spectral calibration for AIUS. A multi-line linear fitting algorithm based on atmospheric characteristic lines is proposed， which employs the key technologies such as Doppler shift correction， lines selection and accurate peak position determination to improve the spectral calibration accuracy. And after the successful launch of GF-5 satellite， a series of spectral calibrations and accuracy analysis are carried out for AIUS. The results show that this algorithm can achieve high precision spectral calibration of AIUS. The mean absolute deviations of MCT and InSb channels are 0.00437cm-1 and 0.00389cm-1， which are less than 0.008cm-1 required by trace gas inversion application.

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DU Li-Li, LIU Li, GE Shu-Le, LI Zhi-Wei, ZHOU Chuang-Jie, DING Guo-Shen. High precision on-orbit spectral calibration of atmospheric infrared ultra-spectral sounder[J]. Journal of Infrared and Millimeter Waves,2021,40(2):214~222

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History
  • Received:May 05,2020
  • Revised:April 16,2021
  • Adopted:June 29,2020
  • Online: March 30,2021
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