极化波

The polarization angular correlation function is calculated by using azimuthal angular averaging.

在L、C及X波段下，首次用极化角相关函数对分形树森林环境中隐蔽目标进行了检测，说明极化角相关函数方法能够抑制杂波，突出隐蔽目标的散射特性，用于杂波环境中隐藏目标的检测。

This article first antenna, microstrip theory, the circular polarization technology, the theoretical discussion, in this based on the microstrip antenna of circular polarization method - corner square microstrip antenna, and has done a design simulation , and then do the design and further research to improve and eventually get a resonant frequency (S11 reflection coefficient corresponding to the minimum frequency) for the 1.5GHz and 1.43GHz, the frequency of circular polarization for the 1.46GHz, S11 is less than -10dB relative bandwidth, the VSWR is less than 2 is about 8.8% relative bandwidth, axial ratio less than 3dB relative bandwidth of about 2.2% of the right circular polarization microstrip antenna design case, which proved very good the circular polarization microstrip antenna theory, also fully confirmed by a square corner design is a practical program, and select the appropriate regulation of sticks is indeed able to improve the performance of the antenna.

本文先对天线、微带理论、圆极化技术等进行了理论论述，在此基础上，提出圆极化微带天线的实现方法——切角方形微带天线，并对此做了设计仿真，后又对这一设计方案做了改进及进一步研究，最终得到一个谐振频率（反射系数S11 的最小值所对应的频率）为1.5GHz和1.43GHz，圆极化频率为1.46GHz，S11 小于-10dB 的相对带宽、驻波比小于2 的相对带宽约为8.8%，轴比小于3dB 的相对带宽约为2.2%的右旋圆极化微带天线的设计案例，从而很好的印证了圆极化微带天线理论，也充分证实了切角方形是一种切实可行的设计方案，而选取合适的调节枝则确能提高天线的性能。

ABSTRACT The dissertation consists of the polarization theory and the scattering theory of polarization including the exact solution for the scattering of plane wave by a chiral elliptic cylinder and the polarization of scattered wave.

本文主要研究了极化理论及目标的极化散射特性，包括研究旋波媒质的电磁极化散射特性，首次给出了旋波媒质椭圆柱散射问题的精确解析解，同时对其散射的极化特性进行了分析。

The scattering by different shape and different media such as dielectric chiral or conduct circular cylider or elliptic cylinder are calculated and RCS curves are maped. The relation between the optimal polarization of the chiral elliptic cylinder and incident angle are maped. In accordance with the map, the information which is useful for radar target identification can be obtained.

对不同形状及参数的导体圆柱、椭圆柱，一般介质圆柱、椭圆柱，旋波媒质椭圆柱的散射特性进行了计算，给出了其RCS的变化曲线，并对极化散射矩阵进行了分析给出了旋波媒质椭柱最优极化的分布图，指出了其可提取用于目标识别的极化信息。

Based on rain drop size distribution data measured in Qingdao, Guangzhou and Xinxiang, the radar reflectivity factor Z for spherical rain drops, the radar reflectivity factor Z〓 and differential reflectivity Z〓 for oblate ellipsoid rain drops have been calculated.

基于雨致交叉极化理论，提出了雨致交叉极化的二阶小变量近似方法以及新的雨致交叉极化预测模式，与其它模式和实验数据比较表明，该模式更能反映波的极化特征，较其它模式有一定的改进。

Keywords polarization;polarimetric SAR;classification;projection index;wavelet-kernel estimation;Bootstrap estimation;sequential projection pursuit cluster model;projection pursuit wavelet learning network;mix

Article From 西北工业大学；计算机科学与技术博士论文 2007年度极化；极化合成孔径雷达；分类；投影指标；小波估计； Bootstrap估计；序列投影寻踪聚类模型；投影寻踪子波学习网络；混合Wishart模型

Polarization filtering technique is widely used in many fields, for example interference suppression of sky wave in HF radar. Based on the actual wave data of both signal and clutter, the cause for generation of error, way of error reduction and improvement of SIR by using polarization filtering technique are discussed.

极化滤波技术在高频雷达抗天波干扰等领域有着广泛的应用，结合实际雷达测得的目标回波和干扰回波矢量数据，对极化滤波误差产生的原因、减小误差的方法以及利用极化滤波方法提高信干比的有效性进行了详细分析。

While we were trying to understand the origin of subcontinental mantle anisotropy by SKS splitting measurements in Qinghai-Xizang plateau, we were perplexed for answers to the following questions:(1) why the inefficient Sn propagation region correlates with the large delay time (1.91-2.40s) of SKS splitting,(2) why very strong δt variations occur at the edges of this region, and (3) what results in the abnormal delay time.

当人们试图解释青藏高原异常的剪切波分裂成因时，以下的问题让人们感到困惑：为什么异常大的SKS分裂延时(1.91-2.4s)出现在青藏高原北部Sn波缺失区；(2)为什么分裂延时突变（1.47s和1.09s）出现在Sn波缺失区的边缘；(3)为什么快波极化方向与地表大规模的构造走向之间存在约20°-30°的偏差。

PolSAR expands the application area of the SAR system and becomes more and more important in applications to collecting information of physical and electromagnetic architecture of superstratum on the ground.

极化SAR是用来测量目标散射信号极化特征的新型成像雷达，它具有能够获得多通道极化图像的优越性，有利于确定和理解散射机理，提高目标检测、辨别和分类能力，有利于抑制杂波，提高抗干扰能力。

It is found thatthe fractal dimension D=1.25 corresponds to the lowest criticalcoupling constant αc=1.9,D=1.73 corresponds to the highest criticalratio of dielectric constants ηc=0.163,and when D≤1.145 bipolaronscan not exist at any rate.In chap,4,we will propose a novelapproach to the calculation of the exciton ground-state energy for thestrong-coupling case.Different from all previous methods,the wavefunction of the phonon part is assumed to take a form related to thewave function of the relative motion.We obtain the exciton energy bysolving the derived integrodifferential equation rather than select ahydrogen-like form to minimize the energy expectation.

结果发现，分数维的维数D＝1.25对应最小的临界的电-声耦合常数(αo＝1.9)，D＝1.73对应最大的临界的介电常数比(ηc＝0.163)，当分数维的维数D≤1.145时，双极化子无论如何也不可能存在，在第四章中，我们将提出一种新颖的变分方法来计算强耦合的激子-声子系统的基态能，不同于以前所有的方法，我们取声子的波函数与相对运动波函数有关的形式，而不是假定一个固定的关于相对运动坐标r的函数形式，得到相对运动波函数所满足的非线性的微分积分方程，我们数值求解这个微分积分方程得到系统基态能，而不是选择一个类氢原子的波函数变分使得能量的期待值最小。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。