基于海表耀斑中红外基准的NPP/VIIRS反射通道在轨验证
投稿时间:2017-01-25  修订日期:2017-09-10  点此下载全文
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作者单位E-mail
景欣 北京大学 vickyxin@126.com 
晏磊 北京大学  
胡秀清 国家卫星气象中心 huxq@cma.gov.cn 
贺丽琴 北京大学  
赵帅阳 北京大学  
胡兴帮 北京大学  
徐寒列 国家卫星气象中心  
林沂 北京大学 yi.lin@pku.edu.cn 
马蔼乃 北京大学  
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:星载成像仪中红外通道通常具备高精度星上黑体定标,且通道辐射在晴空时受大气层温度影响小,而海面耀斑区域形成的近似镜面反射具有反射率较高、发生频次高、表面性能均一、几乎没有波长依赖性等特性,因此可以采用耀斑区中红外反射辐射作为波段间验证的参考基准。文章将美国NPP卫星可见光红外成像辐射仪(Visible Infrared Imaging Radiometer, VIIRS)的中红外通道(中心波长3.697μm)作为检验基准,使用菲涅尔反射定理建立中红外和被验证通道的海表反射率关系,对四个太阳反射通道(中心波长位于0.672、0.862、1.238和1.602μm)进行了基于海水表面耀斑区反射率精度验证并深入分析该方法的不确定度。结果表明:VIIRS四个通道的验证不确定度分别为3.8%、3.9%、4.1%和4.1%,这一方法可实现VIIRS部分光学通道的在轨较高精度验证。
中文关键词:中红外  海面耀斑  VIIRS  定标验证  菲涅尔定律
 
NPP/VIIRS solar reflectance bands radiation validation based on sea surface mid-infrared reference standard on sun glint sites
Abstract:The medium wave infrared channel (MWIR) has the characters of high precision on-orbit calibration and reflectance computation insensitive to the top of atmospheric (TOA) temperature, which make it a suitable reference standard for reflectance validation between bands. The glint area on the sea surface has the characters of relatively high reflectivity, high frequency and uniform surface performance, which make it a suitable test site for on-orbit validation of satellite sensors. Based on the two starting points, this paper first built up the reflectance relationship between MWIR and solar reflectance bands based on Fresnel’s law, then used VIIRS (Visible Infrared Imaging Radiometer) mid-infrared band (3.697μm) as reference standard to validate the four solar reflectance bands (0.672、0.862、1.238 and 1.602μm) on sea surface sun glint regions, and finally analyzed the uncertainties of this validation model. The results show that the uncertainties of the four solar reflectance bands are 3.8%、3.9%、4.1%、4.1%, respectively. Therefore, the model proposed in this paper can be used for optical inter band cross validation.
keywords:mid-infrared  sun-glint  VIIRS  calibration/validation  Fresnel Law
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