红外甚高光谱分辨率探测仪高精度在轨光谱定标
作者:
作者单位:

1.中国科学院安徽光学精密机械研究所 通用光学定标与表征技术重点实验室,安徽 合肥 230031;2.中国资源卫星应用中心,北京 100094;3.北京市遥感信息研究所,北京 100085;4.中国科学技术大学,安徽 合肥 230026

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中图分类号:

TP732.2

基金项目:

国家自然科学基金(41601379)


High precision on-orbit spectral calibration of atmospheric infrared ultra-spectral sounder
Author:
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

Fund Project:

Supported by National Natural Science Foundation of China (41601379)

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    摘要:

    红外甚高光谱分辨率探测仪(AIUS)是高分五号(GF-5)卫星的主要载荷之一,它通过太阳掩星观测实现多种大气痕量气体垂直分布信息的获取,准确的光谱定标是其数据定量反演的关键和基础。针对AIUS超高的光谱分辨率、无配套星上光谱定标设备的问题,提出基于大气吸收特征谱线的多谱线线性拟合算法,通过多普勒频移修正、多谱线筛选、准确谱峰位置确定等关键技术提高其在轨光谱定标精度,并在GF-5卫星成功发射后,围绕AIUS开展了一系列的光谱定标和精度分析工作。结果表明:该方法可实现AIUS的高精度光谱定标,MCT和InSb通道的平均谱峰绝对偏差分别为0.004 37cm-1和0.003 89cm-1,均小于痕量气体反演应用要求的0.008 cm-1

    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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杜丽丽,刘李,葛曙乐,李志伟,周川杰,丁国绅.红外甚高光谱分辨率探测仪高精度在轨光谱定标[J].红外与毫米波学报,2021,40(2):214~222]. 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]. J. Infrared Millim. Waves,2021,40(2):214~222.]

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  • 收稿日期:2020-05-05
  • 最后修改日期:2021-04-16
  • 录用日期:2020-06-29
  • 在线发布日期: 2021-03-30
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