散射理论

The problem of electromagnetic scattering is an important research domain in electromagnetics. It is very important and practical to analyze the electromagnetic scattering characteristics of multiple complicated objects quickly and efficiently.

电磁散射问题是电磁学中的一个重要研究领域，对复杂多目标的电磁散射特性进行快速、高效的分析，具有重要的理论意义和实用价值。

Starting from the theory of interaction between microwave and snow, the behavior characteristics of microwave scattering and radiation of firn layers responding to topography and temperature are studied.

6基于星载微波散射计和辐射计数据的冰盖特性及变化监测研究结合微波与冰雪相互作用的理论，研究了南极冰盖的微波散射、辐射特征与地形、温度等的关系。

Performance of dual-polarization SARs to distinguish three basic scattering mechanisms from an isotropic surface, a dipole, and an isotropic dihedral is studied theoretically. Performance of dual-polarization SARs to identify the eight scattering mechanisms inside the feasible region in H-αplane is analyzed, and a feasible division of H-αplane for HH-VV dual-polarization SAR is obtained in an experimental manner.

推导了双极化H-α平面有效区域的边界，从理论角度研究了双极化SAR对各向同性表面、偶极子和各向同性二面角三种基本散射的识别能力，通过实验分析了双极化SAR对H-α平面有效区域内八种基本散射机理的识别性能，并给出了HH-VV双极化H-α平面的一种可行划分方式。

Both theoretical analysis and experimental results indicate that the linear dependence of the reciprocal of the time-correlation length on the velocity of the moving diffuser is still held in this case.

理论分析和实验测量结果均表明，这种动态散斑的空-时相关函数与一次散射形成的动态散斑相比，对散射体的运动十分敏感，但其时间相关长度与速度的倒数仍然保持线性关系。

On the approximation that the ink is non-scattering and its refractive index is nearly equal to papers, we propose a spectral reflectance color prediction model for recto-verso halftone images by making use of the theory of the light propagation in paper with long- and short-distance model and net structure of multiple reflection in the recto-verso halftone images.

在假定油墨是非散射介质以及油墨的折射率与纸张的折射率近似相等的条件下，利用光在油墨与纸张中散射迁移路径长短不同的分程理论和多重内反射的网状结构分析方法，研究了光照射在双面印刷品上的光谱反射规律，建立了双面印刷品的光谱反射色彩预测模型。

At last,simulation research is carried out on radar echo of two same frequency vibration scatter points.Theoretical annlysis and simulation result indicate that the model is effective and that the periodicity of amplitude modulation function and phase modulation function is invariable as the number of scatter points increased,but,their amplitudes are variational.

最后对两个同频振动散射点合成雷达回波进行了计算机仿真研究，理论分析和仿真结果表明，该模型是有效的，并且随着同频振动散射点数的增加，其幅度调制函数和相位调制函数的周期性不发生变化，只是它们的值会随着振动点数的增加而改变。

On this base, eigen-polarization has been obtained and been used in describing the target polarization scattering characteristics. Polarization features insensible to target's posture have been extracted in accordance with the wideband dynamic distribution information of eigen-polarization in polarization state plane.

在散射矩阵对称性修正的基础上，利用本征极化理论求解了目标的本征极化，并利用它来作为目标极化散射特性的描述，根据它随观测频率在极化状态平面上的动态分布信息，提取了对目标姿态不敏感的极化特征。

The main work and contributions accomplished in this dissertation are as follows:(1) The fundamental theory of electromagnetic wave polarimetry in radar, including the polarization representation of EM wave, the scattering coordinate system in polarimetric SAR imaging and the polarimetric scattering description, is presented.

本文的主要工作和贡献如下：(1)介绍了雷达极化的基本理论，包括极化表示以及极化SAR成像中的散射坐标系和极化散射描述。

The hybrid method first calculates the scattered fields of the Luneburg lens using the spherical vector wave method. Then it transforms the calculated results into the radiation fields in the far region using the reciprocity theorem.

该方法首先用矢量球面波理论计算平面波入射到多层介质球的散射场，在此基础上，用互易原理将散射场转变成天线的远区辐射场。

A look into his scientific pursuit from Rutherford α-particle scattering experiment

这种弹性散射作用产生的出射粒子方向与入射方向的夹角接近180°，最初由卢瑟福作了理论分析和实验测量，故亦称卢瑟福背散射。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷