粗糙体目标激光束散射场的互相关函数统计特征

Mutual correlation function of statistical characteristics of laser beam scattering fields from the target with rough surface

依据高斯波束体目标散射特征,研究了粗糙体目标高斯波束散射场量的互相关函数统计特征。在激光波束入射下,通过数值方法讨论圆球类目标、不同半径、不同材料、不同入射波束极化等条件下,散射场量的互相关函数随散射角变化情况。数值计算结果表明:金属薄膜材料比非金属镀漆材料互相关函数量值要大,金属材料球体目标的后向散射互相关函数值较大,而非金属镀漆材料球体互相关函数值较小。材料表面的粗糙度和目标尺寸对互相关函数影响较大,而入射光的极化方式对相关函数有影响但影响较小。

According to characteristics of Gaussian beam scattering from the target,correlation function of the statistical characteristics of Gaussian beam scattering from the target is studied in this paper.Under the laser beam incidence,numerical methods are used to calculate the correlation function of a sphere changing with scattering angles in different radii,material,incident condition,and so on.The mutual correlation functions of metal film material have larger values than that of painted nonmetal materials.There exist a stronger backward-scattering of metal film material sphere and a stronger forward-scattering of non-metallic paint sphere.Roughness of material film surface and dimension of sphere have bigger influences on the correlation functions of scattering fields,while mutual correlation functions have nearly the same distribution in different incident beam polarization.Our further works will be based on studying other high order statistical moments of laser beam scattering from target with rough surface.