高光谱激光雷达后向散射强度的粗糙表面二向反射模型  

Bidirectional reflectance distribution function model of rough surface based on backscatter intensity of hyperspectral LiDAR

作　　者：田汶鑫 陈育伟 唐伶俐 李子扬 邱实 吴昊昊 张慧静 陈林生 蒋长辉 胡佩纶 贾建鑫 孙海彬 王一程 胡以华 Tian Wenxin;Chen Yuwei;Tang Lingli;Li Ziyang;Qiu Shi;Wu Haohao;Zhang Huijing;Chen Linsheng;Jiang Changhui;Hu Peilun;Jia Jianxin;Sun Haibin;Wang Yicheng;Hu Yihua(Key Laboratory of Quantitative Remote Sensing Information Technology,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Finnish Geospatial Research Institute,Masala FI-02430,Finland;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,China;University of Helsinki,Helsinki 00014,Finland)

机构地区：[1]中国科学院空天信息创新研究院定量遥感信息技术重点实验室,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049 [3]芬兰地球空间研究所,芬兰Masala FI-02430 [4]先进激光技术安徽省实验室,安徽合肥230037 [5]赫尔辛基大学,芬兰赫尔辛基00014

出　　处：《红外与激光工程》2023年第10期84-97,共14页Infrared and Laser Engineering

基　　金：中国科学院战略性先导科技专项(A类)资助项目(XDA26010304)。

摘　　要：高光谱激光雷达是同时获取光谱和空间信息的主动遥感探测方法。在激光扫描过程中,激光入射角是重要的影响因素之一。在实际应用中,目标表面粗糙度会使其入射角效应偏离朗伯模型。因此,基于Oren-Nayar模型对粗糙表面建立二向反射模型,研究了入射角效应的辐射校正方法。选取8种典型的粗糙表面作为实验对象,分析了各波段后向散射强度与入射角的关系,并量化了粗糙度对强度的影响。基于构建的模型,对该研究样本的入射角效应进行辐射校正。辐射校正后,不同入射角反射率的标准差均不大于0.06;与校正前相比,标准差平均改善率为67.86%。结果表明,所提出的方法提高了提取目标反射特性的准确性,为高光谱激光雷达更好地为开展数据分析与应用提供良好的物理基础。Objective The traditional LiDAR system operates at a single wavelength,which limits the acquisition of target attribute information.The spectral information captured by laser backscatter intensity is relatively insufficient,and the detection ability of ground object categories is also limited.Hyperspectral LiDAR,on the other hand,is an active remote sensing method that can obtain spectral and spatial information of targets simultaneously.In addition to 3D coordinates,hyperspectral LiDAR also records the backscatter intensity of each point,enabling the detection of the geometric and reflection characteristics of targets.However,the backscatter intensity of the laser is affected by multiple factors during scanning,making it unsuitable for directly reflecting the reflection characteristics of the target surface.One of the most crucial factors is the laser incidence angle.In practical applications,there are few complete Lambertian targets,and the reflection characteristics of the scanned objects are very complex.Moreover,the roughness of the scanned target deviates from the Lambertian model.Therefore,considering the roughness and micro-structure of the target surface,this study proposes a BRDF model for rough surfaces based on the backscatter intensity of hyperspectral LiDAR through the combination of bidirectional reflection distribution function(BRDF)and radar equation.Methods This paper proposes a BRDF model based on the Oren-Nayar model for rough surfaces to address the effect of incident angle on the backscatter intensity data of hyperspectral LiDAR.The hyperspectral LiDAR system comprises key components such as a laser transmitting unit,a laser receiving unit,a scanning and control unit.By combining theory with experiments,eight typical rough targets were selected to analyze the relationship between backscatter intensity and incident angle of hyperspectral LiDAR and quantify the effect of surface roughness on intensity.The radiometric correction method for the incident angle effect was studied based on the cons

关 键 词：高光谱激光雷达 二向反射模型 Oren-Nayar模型 后向散射强度 入射角 辐射校正 

分 类 号：P237[天文地球—摄影测量与遥感]