红外甚高光谱分辨率探测仪高精度在轨光谱定标
投稿时间:2020-05-05  修订日期:2020-06-26  点此下载全文
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作者单位E-mail
杜丽丽 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 lilydu@aiofm.ac.cn 
刘李 中国资源卫星应用中心  
葛曙乐 中国资源卫星应用中心  
李志伟 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  
丁国绅 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 guoshenahu@163.com 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要: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,准确地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通道的平均光谱绝对偏差分别为0.00437cm-1和0.00389cm-1,均小于痕量气体反演应用要求的0.008 cm-1。
中文关键词:甚高光谱分辨率;光谱定标;特征谱线;多普勒频移;高分五号卫星  太阳掩星
 
High precision On-orbit spectral calibration of atmospheric infrared ultra-spectral sounder
Abstract:The atmospheric infrared ultra-spectral sounder(AIUS) is one of the main loads of GF-5 satellite. It’s 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’s 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 calibration and accuracy analysis are carried out around AIUS. The results show that this algorithm can achieve high precision spectral calibration of AIUS. The mean spectral 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.
keywords:ultra-spectral resolution, spectral calibration, characteristic lines, Doppler shift, GF-5 satellite, solar occulation
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