An assumption is verified that the multi - path arrival time differences calculated by ray model is almost the same as that by normal mode model if higher frequencies for the source are used ( e . g . , frequencies range between 600hz and 1600hz ) . hi other words , the calculation of the multi - path arrival time differences by ray model is reliable . 2 该方法的研究结果验证了一个重要的假设：当信号频率较高时(例如600hz 1600hz ) ，用声线模型计算多途到达时延差与简正波模型得到的结果基本一致，并且声线模型计算多途到达时延差具有较高的可信度。
According to the radar - absorbing model , the performance of rams of various absorber - volume - percentage with various frequency and the radar obsorbing performance of which in various thickness is predicted . according to the radar - absorbing model , the prerequisites of microwave electromagnetic parameters and the border curves for a single - layer homogeneous absorbing coating backed by a perfectly conducting plate to produce zero specular reflection are obtained by the steffensen speedup approach to solve the complex transcendental equation 以吸波模型为依据，用计算机求解了单层均匀各向同性吸波材料的阻抗匹配条件，通过数值模拟得到了吸波材料阻抗匹配时电磁参数边界曲线的数值模拟等式和阻抗不匹配时宽带吸波材料电磁参数的合理搭配规则和频散特性。
Super - resolution spatial spectrum estimation is applied in this dissertation to realize bearing resolution by utilizing the different bearings between targets and first - order sea echoes . the simulation of radar echoes in one resolution cell is presented based on the theoretically analyzing hf sea clutter sea clutter reflection characteristic and sea echo spectrum stretching mechanics 本文从分析高频海杂波反射特性以及平台运动引起海浪展宽机理入手,建立便于理论研究的一阶展宽的海杂波和二阶海杂波模型;在分辨单元上对雷达回波信号进行了仿真。
Following an iterative reduced - dimensional strategy , the problem of " dimension curse " can be solved effectively . in the last section of this chapter , a cascade wavelet model , which is combined with a static wavelet submodel and a dynamic linear submodel , is presented to identify the dynamic nonlinear systems 最后，提出一种串联小波模型，将现有的静态小波模型与动态线性子模型串联，可以很好地辨识非线性动态系统，而且避免了动态神经网络中非线性与记忆混合的复杂性。
The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker , and establishes a radar signal simulation model , including radar emitting signal model , receiving signal model , receiving echo signal model , clutter model , noise model , sum channel directional pattern of antenna model , difference channel directional pattern of antenna model , sheltering model , rcs model , glint noise model , etc . the second section studies signal processing of pulse doppler radar seeker , and establishes radar signal processing mathematical model and data processing mathematical model for simulation , including windowing , doppler filtering , envelope demodulation , pdi , cfar , centering , velocity tracking , angle tracking , a - b filtering , etc . the third section studies the modeling of modified proportion guiding , and establishes guiding model , then dynamic simulation results is provided 论文的主要工作包括四部分：第一部分研究了脉冲多普勒雷达导引头的信号建模问题，建立了雷达信号模型，主要包括：发射信号模型、接收信号模型、目标回波信号模型、杂波模型、噪声模型、和差通道天线方向图模型、遮挡因子模型、接收机噪声模型、目标雷达截面积统计性模型、目标角闪烁模型等。第二部分研究了脉冲多普勒雷达导引头的信号处理模式，建立了信号和数据处理模型，主要包括：加窗和多普勒滤波、包络检波、检波后积累、频域cfar处理、速度定心、速度跟踪、角跟踪、 ?滤波等，然后给出了信号处理流程。
In addition , this paper selects the water traveling wave model of the surface irrigation , and realizes the modeling of the water movement , according to the water movement characteristics of surface irrigation . furthermore , the optimization model for irrigation effects is used to produce the calculation pattern in which the water movement model is combined with optimization of technical parameters of irrigation . therefore , it is realized that the optimum unit discharge is calc ulated under the condition of definite length and slope of border check and the optimum length of border check is calculated under the condition of definite unit discharge and slope 与此同时，在分析项目区耕作条件下灌溉水流运动特点的基础上，选择地面灌溉水流运动波模型，实现了地面灌溉水流运动的数值模拟，并利用灌溉效果优化模型，构造了地面灌溉水流运动模拟与灌水技术参数优化相结合的计算模式，实现了定畦长、定坡降条件下的优化单宽流量求解和定单宽流量、定坡降条件下优化畦长的求解，为变灌水条件下优化灌水技术参数的确定提供了强有力的工具。
According to the seismic convolution model , a kind of matched filters in time - scale domain is designed for echo signal detection of ground penetrating radar ( gpr ) and implemented in this paper , which is applied to detect the location and amplitude of single reflection wavelet in receiving signal through continuous wavelet transform 摘要根据地震褶积模型，设计并实现了应用于探地雷达回波信号检测的时间尺度域匹配滤波器，利用小波变换的时间定位性和尺度伸缩性，检测出雷达接收信号中单个反射子波的位置与强弱信息，利用已知的雷达发射子波模型还原回波信号，达到了滤除噪声、最佳接收的目的。
Abstract : a continuity wave model is put forward for the dispersion processof liquid - liquid two - phase system , by coupling mass and momentum conservation equations of two - fluid model . the conditions that result in a dispersion choke and the weak instability of a dispersion process are derived from the model . the phenomena of catastrophic inversion and transitional inversion are explained . the effect of drop size distribution on the maximum volume concentration of a emulsion is predicted using the model . according to the theory herein , emulsion inversion is the regime transition of liquid - liquid system due to the instablity of a dispersion process . the effect of drop size distribution on the maximum volume concentration of a liquid - liquid emulsion only occurs in a certain range of weber numbers 文摘:以双流体模型为基础，通过质量守恒方程和动量守恒方程的耦合，提出了液-液两相系中弥散传质的连续波模型.由该模型得到弥散传质过程阻塞和弥散传质过程弱不稳定性产生的条件，计算了液滴尺寸及其分布对乳化液极大堆砌分数的影响，解释了剧变型乳化逆变和渐变型乳化逆变现象.研究结果表明，乳化逆变是由于弥散传质过程的不稳定性而引起的悬浮体型态的改变，随液滴尺寸多分散性的增大，极大堆砌分数增大；随液滴平均尺寸的增大，多分散性对极大堆砌分数的影响减弱；当韦伯数足够大时，液滴尺寸及其分布对乳化液极大堆砌分数无影响
The following algorithms have been proposed and tested in the thesis : 1 frequency selective fading : combine the isomorphism between the input space and the output space and propose a new approach to blind equalization of the channel . compared with conventional methods , the new approach offers lower computational complexity , better performance , and more robust against the over - determination of the system order ; 2 time selective fading : a new approach to the equalization of time selective channel based on the zero - forced equalizer is proposed which is more simple in its structure of algorithm ; 3 time - varying channel : using the instantaneous mean value changes of the output signal to extract the information of channel variations and model it using ar model , kalman filter is then employed to track channel variations , it bears faster ability in tracking the variation of tv channels ; based on the isomorphism between the inputs and the outputs and some of the approaches using in mimo system , a new algorithm of equalization of simo time - varying channel is proposed , which also share the merits of being robust against the over - determination of the system order ; model the time - varying channel using the multi - resolution decomposition wavelets , and then a blind identification method based " on the model is proposed ; at last , a new model for equalization and identification of mimo system is proposed 主要工作在以下几个方面： 1 、针对频率选择性衰落信道：结合输入输出空间同构关系提出一种新的频率选择性信道均衡方法，与传统方法相比，该方法计算量更小，收敛速度更快，性能更优，且对系统阶次的过确定表现稳健，具有实际均衡应用价值； 2 、针对时间选择性衰落信道：提出一种基于迫零均衡的时间选择性信道均衡方法，算法结构简单； 3 、针对时变色散信道：利用瞬态均值曲线提取信道时变信息，对之ar建模，利用卡尔曼滤波器跟踪时变信道抽头变化，可以快速跟踪信道变化；基于输入输出空间之间的同构关系以及多输入多输出系统的处理方法，提出了新的单输入多输出色散时变信道均衡与识别算法，同样具有对信道阶次过确定保持稳健的优点；结合小波多分辨率分析提出一种基于小波模型的信道盲识别算法；研究时变的多输入多输出系统的盲均衡与盲反卷积问题，给出一种时变系统处理模型。
Further , analyse the characteristic of the seismic wavefield of fractural reservoir and the influence caused by fracture density , property of the filled material and the strike of fracture . fifthly , in term of research of zhangshulun et al . , concisely discuss the arithmetic of the plane wave forward modeling and migration with phase shift method , in prestack common offset gathers and check the arithmetic by numerical simulation 第四，用基于弹性?声学近似的反射系数计算公式和本文提出的付氏变换子波生成法得到缝洞模型的反射系数模型和子波模型并用vrselrf波场延拓算子对其进行地震波场数值模拟；进一步分析了缝洞储层的地震波场特征及缝洞密度、充填物性质和裂缝走向对其波场特征的影响。
