基于星载偏振交火模式的气溶胶层高被动遥感成像反演信息量分析  

Information Analysis of Passive Remote Sensing Imaging Retrieval of Aerosol Layer Height Based on Spaceborne Polarization Crossfire

作　　者：顾浩然 李正强 侯伟真 刘振海 伽丽丽 李殷娜 郑杨 史正 许华 洪津[4] 麻金继 陈震霆 Gu Haoran;Li Zhengqiang;Hou Weizhen;Liu Zhenhai;Qie Lili;Li Yinna;Zheng Yang;Shi Zheng;Xu Hua;Hong Jin;Ma Jinji;Chen Zhenting(College of Geography and Tourism,Anhui Normal University,Wuhu 241000,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;School of Information Engineering,Kunming University,Kunming 650214,Yunnan,China)

机构地区：[1]安徽师范大学地理与旅游学院,安徽芜湖241000 [2]中国科学院空天信息创新研究院,国家环境保护卫星遥感重点实验室,北京100101 [3]中国科学院大学,北京100049 [4]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [5]昆明学院信息工程学院,云南昆明650214

出　　处：《光学学报》2023年第6期55-71,共17页Acta Optica Sinica

基　　金：国家杰出青年科学基金(41925019);国家自然科学基金(41871269,42175148);云南省地方联合基金(202001BA070001-090);云南省李正强专家工作站(202205AF150031)。

摘　　要：为探究高精度偏振扫描仪(POSP)在偏振交火模式下紫外波段对气溶胶层高(ALH)的探测能力,基于最优估计理论和信息量分析方法,分析了紫外和近紫外波段模拟仿真数据对ALH的灵敏度,并进一步讨论了不同观测组合对ALH信息量和后验误差的影响。研究结果表明:拓展的紫外波段是卫星遥感ALH反演的重要信息源,进一步增加380 nm偏振探测后,ALH的信息自由度(DFS)提高了0.06~0.26,同时后验误差降低了5~30个百分点;联合近紫外410 nm探测信息后,ALH反演后验误差额外降低了7~10个百分点,尤其增加了标高H较低时ALH的反演信息量;观测信息对标高的敏感度随着卫星观测散射角的增大而逐渐降低;粗模态主导的气溶胶、裸土地表相较细模态主导的气溶胶、植被地表来说提供的ALH信息量更少。总体来说,虽然ALH信息量受到气溶胶类型影响表现出了一些差异,但是不同气溶胶类型间ALH信息量受地表类型和偏振测量等的影响通常是相似的。Objective,As one of the spaceborne detection schemes with the strongest comprehensive aerosol capability at this stage,the polarization crossfire(PCF)strategy has been developed by China.It is composed by the Particulate Observing Scanning Polarimeter(POSP)and the Directional Polarimetric Camera(DPC)together,and has been launched on board the Chinese GaoFen-5(02)and Chinese Atmospheric Environmental Monitoring Satellite(DQ-1),which have been launched in the year of 2021 and 2022.In order to explore the detection ability of the Particulate Observing Scanning Polarization(POSP)based on polarization crossfire in the ultraviolet(UV)band for aerosol layer height(ALH),we focus on the sensitivity study of ALH with the synthetic data in the UV and near-UV wavelength,and further to assess the impact of different conditions on the information content and posterior error of ALH.We hope that our findings can be helpful on the retrieval algorithm development of ALH.Methods Optimal estimation(OE)theory and information content analysis method are employed in this study.OE provides statistical indicators such as averaging kernel matrix and the degree of freedom for signal(DFS),which can represent how much information about the retrieved parameters we can obtain from the satellite measurements.So,combined with the forward simulation of specific satellite sensor observations,information content analysis has been demonstrated to provide support for satellite sensor design and retrieval algorithm development.The advantage is that the retrieval capability can be quantified without invoking the development of true inversion;rather,it provides a top-level physics-based guidance on algorithm design.First,the Unified Linearized Vector Radiative Transfer Model(UNL-VRTM)is used as the forward model to calculate the normalized radiance and polarized radiance at the top of atmosphere(TOA),as well as the Jacobians of TOA results with respective to corresponding parameters.DFS and a posteriori error are introduced to quantity the information c

关 键 词：大气光学 偏振扫描仪 气溶胶层高 偏振遥感 信息量分析 

分 类 号：TP721[自动化与计算机技术—检测技术与自动化装置]