【作者】 陈辉；

【导师】 吴振森；

【作者基本信息】 西安电子科技大学 ， 无线电物理， 2002， 硕士

【摘要】 本文主要研究了单层和多层涂层结构介质的光散射特性，以及近场条件下复杂目标对激光波束的散射，其主要工作如下： 1、采用一阶多重散射近似理论分析单层涂层对光波的散射和反射，计算并讨论了辐射强度、双向反射分布函数和单位面积激光雷达散射截面随涂层结构参数的变化规律，数值分析了粗糙基底对双向反射分布函数的影响。 2、基于辐射输运方程，运用蒙特卡罗方法研究具有任意涂层的光散射。考虑涂层介质表面的反射和透射，以及随机粗糙表面的影响，提出了一种改进的蒙特卡罗计算辐射输运问题的新算法。该算法可用于模拟计算单层和多层涂层，平行平面结构和粗糙表面情况下的光散射行为，较好地处理多层涂层结构中各层间的反射和透射，模拟结果与文献结果吻合的很好。 3、研究激光引信波束对复杂目标在近场交会过程中的散射特性。根据有关测量数据，提出了激光引信的发射波束模型，并结合粗糙面散射理论，导出面元散射功率方程，给出导体球的激光近场散射功率结果。 4、提出激光引信目标近场散射特性仿真算法，编制了仿真软件，并以F16飞机为例，通过几何建模和消隐处理，计算了目标不同姿态、不同脱靶量和不同脱靶方位角时，弹目交会过程激光引信接收系统的接收功率。更多还原

【Abstract】 In this dissertation, the property of light scattering by coating layers is systematically investigated, and laser beam scattering by a complex object in near field is also studied. The main works and results are as follows:1. By use of one order multiple scattering theory, light scattering and reflection by a single coating layer is analyzed. The variance of radiation intensity, bidirectional reflection distribution function (brdf) and laser radar scattering cross section with coating layer parameters is given, with the effect of rough contrast on bidirectional reflection distribution function.2. Based on the radiation transfer equation, light scattering by coating layer is studied by using Monte Carlo method. A new improved Monte Carlo method is proposed considering reflection and transmission on the surface of coating layers and the effect of random rough surfaces. The method can simulate light scattering behavior on the condition of single layer and multiple layers, and preferably deals with reflection and transmission between layers, with a good agreement with literature results.3. Laser beam scattering by an object in near field is studied. First, base on the measure data, a mathematical description of the angular distribution of detonator laser beam is given. Secondly, by using the scattering characteristics of rough surface, the relation formula between received power and transmitted power of remote system for a facet is derived. Finally, the scattering power for a conductor sphere is computed.4. A simulative algorithm of laser beam scattering by an object in near field is given. Based on the algorithm, a simulative software is worked. And by using geometrical modeling and hiding, the received power of remote system for F16 airplane, as an example, is computed.更多还原