风速对海面长波红外偏振度的影响研究  

Research in effects of wind speed on long wave infrared polarization of sea surface

作　　者：宿德志 刘亮 刘陵顺 SU De-zhi;LIU Liang;LIU Ling-shun(College of Basic Sciences for Aviation,Naval Aviation University,Yantai 264001,China;Coast Guard College,Naval Aviation University,Yantai 264001,China)

机构地区：[1]海军航空大学航空基础学院,山东烟台264001 [2]海军航空大学岸防兵学院,山东烟台264001

出　　处：《激光与红外》2021年第12期1620-1627,共8页Laser & Infrared

基　　金：国家自然科学青年基金项目(No.11704411)资助。

摘　　要：粗糙海面偏振特性对海面场景下的目标探测和识别具有较大影响。为了研究不同风速和探测角下海面长波红外偏振特性,基于双向反射分布函数和菲涅尔反射公式推导了长波红外偏振度计算模型,依据海浪谱和快速傅里叶变换法建立海面模型,并结合中国台站实测数据,计算了海水辐射和天空大气辐射,仿真分析了不同风速条件下海面在长波红外波段的偏振特性,仿真结果表明:随着风速的增加,各面元入射角的分布几乎对称的向两侧拓展,使得偏振度峰值减小,对应的探测角减小,当探测角小于63°时,偏振度随风速增加而增加,探测角大于63°时,偏振度随风速增加而减小,探测角为63°时,海面偏振度基本不受风速影响。研究结果对海面场景下的红外偏振探测有一定指导意义。Rough sea surface polarization characteristics have great influence on target detection and recognition in sea scene.In order to studying on infrared polarization of sea surface in different wind speeds and detecting angles,the long wave infrared polarization calculation model is derived based on the bidirectional reflectance distribution function and Fresnel′s law of reflection.The sea surface model is established based on wave spectrum and fast Fourier transform.Combined with the measured data of Chinese stations,the radiance of seawater and the radiance of sky and atmosphere are calculated.The polarization characteristics of sea surface in long wavelength infrared band under different wind speed are analyzed.The simulation results show that the distribution of the incident angle of each micro element extends to both sides almost symmetrically,so that the peak polarization degree decreases and the corresponding detection angle decreases,with the increase of wind speed.When the detection angle is less than 63°,the degree of polarization increases with the increase of wind speed;when the detection angle is greater than 63°,the degree of polarization decreases with the increase of wind speed;when the detection angle is 63°,the polarization degree of sea surface is almost unaffected by wind speed.The results have some guiding significance for infrared polarization detection in sea surface scene.

关 键 词：长波红外 海面 偏振度 海浪谱 

分 类 号：TN21[电子电信—物理电子学]