基于长波红外的海面场景偏振特性分析与建模  

Study and modeling of infrared polarization characteristics based on sea scene in long wave band

作　　者：张景华 张焱[1] 石志广[1] ZHANG Jing-Hua;ZHANG Yan;SHI Zhi-Guang(Science and Technology on Automatic Target Recognition Laboratory,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院ATR重点实验室,湖南长沙410073

出　　处：《红外与毫米波学报》2018年第5期586-594,共9页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(61302145);武器装备预研基金(9140C800302KG01)。

摘　　要：针对海面场景长波红外偏振特性建模问题,文中根据表面微元双向反射分布函数BRDF,对物体表面偏振效应进行了分析,并结合红外发射效应和红外反射效应的综合作用,提出了一种长波红外偏振度计算模型.该模型有效描述了偏振度和物体自身红外发射值、红外反射值以及探测角之间的关系.利用Radtherm IR软件对海水辐射、大气辐射与舰船目标辐射进行计算,结合本文构建的偏振度计算模型,仿真了不同时间段内、不同观测角度下海面背景和舰船目标在长波波段的偏振度变化规律.通过仿真数据与实际测量数据的对比分析,结果表明两者具有较好的拟合度,验证了该模型对于海面场景偏振度计算的有效性.According to the surface micro-element bidirectional reflectance distribution function(BRDF),the polarization effect of the object’s surface is analysed.Based on infrared polarization characteristics in long wave band,a model combining the infrared reflected effect and emitted effect is developed to calculate the polarization degree.The simulation result of this model indicates that the degree of polarization is determined by the value of the ratio of emitted radiation to reflected radiation.With the use of RadThermIR,the emitted radiation and reflected radiation of the sea surface and ship targets can be obtained.Based on radiation results and the proposed polarization calculation model,the polarization degree of the ship and sea water surface in different time and different detected angle is simulated.Experiments were conducted to measure the polarization degree in sea scenarios.The experimental data are consistent with the simulated results,which validates the effectiveness of the proposed model.

关 键 词：红外偏振 斯托克斯矢量 偏振仿真 发射和反射 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]