In addition , a shadowing function applicable to multiple scattering is taken into account , which extends the calculation to the surface with anisotropic slope distribution 引入考虑多次散射的遮蔽函数来修正掠入射情况下的散射系数，并将计算范围扩展到均方根料率各向异性的二维粗糙面。
This method has been applied to analyze electromagnetic scattering from random rough surface , two - dimensional random dielectric cylinders , microstrip structures and densely packed interconnects 目前这种方法已被应用于随机粗糙面散射问题的分析、随机分布的二维介质柱的散射分析、微带结构的分析、密集封装的互联分析等问题中。
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 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。
Then based on kirchhoff approximation theory , the formula of the coherent and incoherent scattering intensity of plane wave from two dimensional dielectric normally distributed rough surface are derived , and the scattering intensity of a planar , rough surface of unit area 然后从粗糙面散射kirchhoff标量近似理论出发,得到了平面波对高斯分布的二维随机粗糙面的相干散射和非相干散射强度表达式,并给出了单位面积粗糙面非相干散射的表达式。
The rough degree of the target surface is the important factor that influences the scattering characteristic of the target laser . the study of the rough surface scattering is very important to the identifies and characteristic distill of the space target . usually on the study of in the past rough surface scattering , the period function or random function are the mathematics model of the rough surfaces 粗糙表面散射的研究对空间目标识别和特性提取具有非常重要的意义,在过去的粗糙表面散射研究中,通常采用特定的已知周期函数或随机函数作为粗糙表面的数学模型,但在自然界中粗糙面既非纯周期也非完全随机的。
Base on helmholtz integral equation , the incoherent scattering of plane wave from rough cone - shaped surface is derived with the far field theory and stationary phase method . and the incoherent scattering of plane wave from rough conical surface is also derived with shadowing function when the the radius of principal 最后计算并分析了入射光为= 0 . 48 m时,粗糙锥面的平面波散射特性,考察了入射波和散射波的几何关系,偏振态以及粗糙面统计参量等对散射强度的影响。
But in the nature rough surface is not pure period or completely random . as far as statistics view is considered , one - dimensional ? two - dimensional random rough surface , also all exist the likeness and the self - affine in the certain degree , and have a certain fractal characteristic . we adopt the fractal theories that can describe actual rough surface betterly . by the fractal theories the thesis acquire one - dimensional ? two - dimensional random rough surface model , and study scattering characteristic of light on one - dimensional ? two - dimensional fractal rough surface 从统计意义上来讲,一般的一维?二维随机粗糙面,在一定的标度之间也都存在着自相似性或自仿射性,具有一定的分形特性,采用分形理论能更好地描述实际的粗糙表面。
The first section introduces the background , significance and the relative development of the dissertation . then the roughness of rough surface and the basic theories of the scattering of electromagnetic waves from rough surfaces are discussed , and the kirchhoff approximation and small perturbation method are presidented in detail 然后介绍了描述随机粗糙面的有关统计特性参量,给出了处理粗糙面散射问题的不同方法,指明了各自的适用条件,并对经典粗糙面电磁散射的kirchhoff标量近似法和微扰法做了详细阐述。
Significant progress in theoretical and experimental study on light scattering from random surfaces has acquired more attention during the years and stimulated wide applications of its fruits in modern military , remote sensing , radiation calibration and industrical on - line surface examination 随机粗糙面光散射的理论与实验研究在近年来取得了一系列重要的进展,得到了人们越来越多的重视。它在现代军事、遥感、辐射定标以及工业在线表面检测等领域的应用日益广泛。
The scattering intensity of rough surface is computed , while the roughness , polarization , observation station and the refractive index are different , and the wavelength of incident light is 0 . 48 m . the results indicates the rougher the rough surface is , the less the coherent scattering is ; the influence of the smaller refrective index is more than larger one by the polarization 计算了入射光波长为0 . 48 m时,不同粗糙度,偏振态,散射角以及不同折射率的粗糙面散射强度,结果表明,粗糙面越粗糙,相干散射越小,非相干散射越强;偏振态对折射率大的粗糙介质面影响较小,对折射率较小的介质面的影响较大。
