路径积分差分吸收激光雷达反演模型设计与测试  

Design and Test of Integral Path Differential Absorption Lidar Inversion Model

作　　者：张豪伟 韩舸 马昕[3] 龚威 王琦[4] ZHANG Haowei;HAN Ge;MA Xin;GONG Wei;WANG Qi(School of Electronic Information,Wuhan University,Wuhan 430079,Hubei,China;School of Remote Sensing and Information Engineering,Wuhan University,Wuhan 430079,Hubei,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,Hubei,China;Major and Special Engineering Center,State Administration of Science,Technology and Industry for National Defense,Beijing 100101,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430079 [2]武汉大学遥感信息工程学院,湖北武汉430079 [3]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [4]国家国防科技工业局重大专项工程中心,北京100101

出　　处：《上海航天（中英文）》2023年第3期37-45,共9页Aerospace Shanghai（Chinese&English）

基　　金：国家自然科学基金(42171464、41971283);湖北省重点研发计划(2022BCA057、2021BCA216)。

摘　　要：激光雷达作为主动探测手段,能够较好地弥补被动卫星(如OCO-2/3、GOSAT-1/2和Tan Sat等)的不足,实现高精度、全天候和全天时的观测。中国在2022年4月16日成功发射世界首颗基于主动理论探测二氧化碳柱浓度(XCO_(2))的激光雷达卫星。本文基于前期在秦皇岛的缩比飞行试验数据,围绕优化积分权重函数和优化差分吸收光学厚度两大核心要素,提出了基于光谱能量模型的算法框架。该框架旨在提高基于主动理论的星载激光雷达探测XCO_(2)反演的精度。评估获得光谱能量模型在海上、陆地上的测距精度分别为0.74和6.20 m。论文的工作在10 s滑动平均值下,海洋、城市和山区的平均XCO_(2)值分别为411.07×10-6、425.71×10-6、417.87×10-6,标准差分别为1.93×10-6、0.85×10-6、0.96×10-6。综上所述,光谱能量模型对我国发展基于差分吸收激光雷达的二氧化碳浓度算法具有重要的参考意义。As an active detection method,lidar can make up for the shortcomings of passive satellites(e.g.,OCO-2/3,GOSAT-1/2,and Tan Sat),and achieve high-precision,all-weather,and all-day observation.China successfully launched the first lidar satellite in the world based on the active theory to detect carbon dioxide column concentration(XCO_(2))on April 16,2022.Based on the previous scale flight test in Qinhuangdao,this paper proposes an algorithm framework based on the spectral energy model around the two core elements of optimizing the integral weight function and optimizing the differential absorption optical depth.The framework aims to improve the accuracy of XCO_(2) inversion for spaceborne lidar detection based on the active theory.Based on the scaled airborne experimental data,the ranging accuracy of the spectral energy model on sea and land is evaluated to be 0.74 m and 6.20 m,respectively.The spatial vertical resolution of the integral path differential absorption(IPDA)lidar hardware device used in this paper is 1.2 m,which means that the sea surface model verification results show that the algorithm accuracy has entered the sub-meter level.The average XCO_(2) values of the ocean,urban,and mountain areas are 4.1107×10-4,4.2571×10-4,and 4.1787×10-4,respectively,while the standard deviations are 1.93×10-6,0.85×10-6,and 0.96×10-6,respectively,based on a 10 s moving average.The spectral energy model has important reference significance for the development of carbon dioxide concentration algorithm based on IPDA lidar in China.

关 键 词：路径积分差分吸收 碳监测 激光雷达卫星 大气环境卫星 二氧化碳 

分 类 号：TN950[电子电信—信号与信息处理]