陆基条件下典型地物和伪装光谱影响因子分析  

Study on the Spectral Characteristics of Ground Objects in Land-Based Hyperspectral Imaging

作　　者：周冰 李秉璇 贺宣 刘贺雄 王法臻 ZHOU Bing;LI Bing-xuan;HE Xuan;LIU He-xiong;WANG Fa-zhen(Electronic and Optical Engineering Department,Army Engineering University of PLA,Shijiazhuang 050000,China)

机构地区：[1]陆军工程大学电子与光学工程系,河北石家庄050000

出　　处：《光谱学与光谱分析》2021年第9期2956-2961,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61801507)资助。

摘　　要：近年来,随着军事侦察识别技术的快速发展,用于侦察探测的军事装备已经逐步实现高精度化水平,拥有高技术侦察手段的一方往往可以对目标实施精准打击,大大降低战争胜利的成本。在高光谱成像方面,目前比较成熟的有卫星遥感和高空航空成像技术,这两种成像方式侦察时间大致相同,入射光方向基本一致,并且由于高光谱设备基本垂直于地面,因而反射光方向保持不变,地物的BRDF系数比较固定。在陆军应用时,侦察时间随机,太阳的入射角度时刻变化,而且侦察的方向任意,高光谱在地面或者近地位置,探测方向变化无穷,地物在不同成像条件下的光谱曲线受到物体表面的BRDF系数影响凸显。通过展开不同的实验,挑选了绿地植被和三种人造伪装材料,细致的分析了太阳高度角、方位角和探测角对陆基条件下地物光谱的影响。实验结果表明,虽然四种材料的反射特性存在差异,但在不同的太阳高度角、探测角以及探测器与地物的方位角上呈现相似的规律。对于太阳高度角,当探测角一定时,人造伪装物光谱一般随着太阳高度角的变化整条光谱曲线都发生变化,反射比曲线呈现出平移的规律,而绿地植被在白光波段变化不很明显,在近红外波段的变化很明显,随着太阳高度角的升高先升然后降低;对于方位角而言,四种材料随着方位角的增大,光谱反射比一般先升高后降低,同时后向观测时的反射比一般比前向观测时大;对于探测角,三种材料的光谱反射比与探测角的关系并不很大,但三种材料均在不同的探测角度上出现了“热点”现象。最后,对绿地植被和迷彩伪装板的BRDF模型参数进行了分析,得到了其在不同方向上的反射规律。In recent years,the military equipment used for reconnaissance has achieved high precision levels.The high-tech reconnaissance methods can often perform precise strikes on targets,greatly reducing victory in war.Two commonly used methods for acquiring hyperspectral data are hyperspectral satellite remote sensing and high-altitude aerial technology.These two imaging methods have the same reconnaissance time.The direction of light source is basically the same.Because the hyperspectral equipment is basically perpendicular to the ground,the reflected light direction usually keeps unchanged,the BRDF coefficient of the ground features is basically relatively fixed.In army application,the reconnaissance time is random,the incident angle of the sun changes all the time,and the reconnaissance diction is arbitrary,the hyperspectral position is on the ground or near the ground,the detection direction changes endlessly.The spectral curves under different conditions are greatly affected by the BRDF coefficient of the object surface.This paper analyzes the influence of the sun's altitude,azimuth and the detection angle on the camouflage and green vegetation spectrum under land-based conditions.The results show that although the reflection characteristics of the three materials are different,they present similar laws at different solar altitude angles,azimuth angles and detection angles.When the detection angle is constant for the solar altitude angle,the reflectance curves of the artificial camouflage and the green vegetation first increase and then decrease with the increase of the solar altitude angle.The green vegetation changes more obviously in the near-infrared band;for the azimuth,as the azimuth angle increases,the spectral reflectance of the three materials generally increases first and then decreases.At the same time,the reflectance during backward observation is generally larger than forwarding observation;for the detection angle,the relationship between the spectral reflectance of the material and the detection angl

关 键 词：高光谱成像 反射比 陆基 伪装 

分 类 号：TP72[自动化与计算机技术—检测技术与自动化装置]