典型卫星表面材料近红外偏振特性分析

Analysis of Near-Infrared Polarization Characteristics of Typical Satellite Surface Materials

为了表征典型卫星表面材料的近红外偏振特性,基于微面元模型并综合考虑镜面散射及漫散射来描述目标表面的反射特性,引入镜面系数及漫反射率来明确两种反射对偏振度的影响,并考虑实际粗糙材料表面存在的遮蔽效应,建立一种更完善的多参量偏振双向反射分布函数模型,进而推导出适用于粗糙材料表面的光学反射偏振度表达式。对典型卫星表面材料进行近红外偏振实验,采用遗传算法从实验数据中反演卫星表面材料的多参量数值,进而得到偏振信息仿真曲线。结果表明,该多参量偏振双向反射分布函数的仿真值与实验测试值能够较好的吻合,不同卫星表面材料的近红外偏振特性有较大分布差异。

In order to characterize the near-infrared polarization characteristics of typical satellite surface materials,the reflection characteristics of the target surfaces are described based on the microplane element model and considering the specular scattering and diffuse scattering comprehensively.The specular coefficient and diffuse reflectance are introduced to clarify the influence of the two kinds of reflection on the polarization degree,and the masking effect of the actual rough surface is considered.A more perfect model of multi-parameter polarization bidirectional reflection distribution function is established,and the expression of polarization degree of optical reflection suitable for rough material surface is deduced.The near-infrared polarization experiments of typical satellite surface materials are carried out,and the multi-parameter values of satellite surface materials are retrieved from the experimental data by using genetic algorithm,and then the polarization information simulation curve is obtained.The results show that the simulated values of the multi-parameter polarization bidirectional reflection distribution function are in good agreement with the experimental values,and the polarization characteristics of different satellite surface materials have great differences in distribution.