粗糙表面偏振二向反射分布函数的影响参数及其反演

针对目标偏振二向反射特性研究中模型参数难以准确确定的问题,分析了粗糙表面偏振二向反射分布函数的影响参数,并通过理论推导和仿真计算,研究了各参数对粗糙表面散射特性的作用机理。总结分析了现有参数反演方法,针对现有方法存在的理论缺陷,在P-G(Preist-Germer)模型的基础上,提出了利用"相对偏振分量-角度"的相关关系进行参数反演的方法,设计了参数反演算法,进行了标准反射板和绿漆表面的偏振二向反射特性测试实验,并根据实验数据进行了参数反演和模型验证。实验结果表明,改进的参数反演方法可准确反演所有模型参数。利用反演参数进行模型验证,结果显示模型预测数据与实验数据具有较好的吻合度,验证了模型的准确性。

Parameters of the Polarimetric Bidirectional Reflectance Distribution Function of Rough Surfaces and Parameter Inversion

To correctly and accurately inverse parameters of the model in study on pBRDF (Bidirectional Reflectance Distribution Function),we studied the parameters of pBRDF model and their effects on the scattering characteristics of rough surfaces by theoretical analysis and simulation.A new method making use of the relationship between relative polarization and angles based on P G (Preist Germer) model was proposed,and a parameter inversion algorithm was developed,following a review of existing parameter inversion methods.Then,we undertook an experiment to measure the pBRDF data of a standard reflectance board and green paint,and calculated the parameters with our new method and validated the inversion model with the data.The results show that the improved parameter inversion method is able to inverse all parameters of the model correctly,and the model forecasted data using the inversed parameters is in good agreement with measurement data,validating correctness and accuracy of the inversion model.