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Application of wavelet analysis for detection of cylindrical objects in dielectric layer using characteristic of reflection 小波分析在利用反射特性检测介质层圆柱形物体中的应用
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106890
M. Andreev, O. Drobakhin, D. Saltykov
{"title":"Application of wavelet analysis for detection of cylindrical objects in dielectric layer using characteristic of reflection","authors":"M. Andreev, O. Drobakhin, D. Saltykov","doi":"10.1109/MMET.2002.1106890","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106890","url":null,"abstract":"The problem of detection and estimation of parameters of cylindrical objects in a dielectric layer using a reflection characteristic has been considered. A reflection characteristic for fixed frequency was obtained by scanning the interface of the dielectric structure with a measuring antenna probe. Use of multiscale discrete wavelet analysis has allowed one to select the peculiarities of the reflection characteristic which have been caused by the presence of objects. Thus their localization on the background of noise has been completely successful. The approximating properties of different wavelet bases for the given class of physical data using different types of measuring probes at different frequencies and for different depth of object dispositions have been explored.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123067572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diffraction by a screened chiral layer with a grating 用带光栅的屏蔽手性层衍射
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1107023
S. Panin, A. Poyedinchuk
{"title":"Diffraction by a screened chiral layer with a grating","authors":"S. Panin, A. Poyedinchuk","doi":"10.1109/MMET.2002.1107023","DOIUrl":"https://doi.org/10.1109/MMET.2002.1107023","url":null,"abstract":"Polarization characteristics of the reflecting structure like a chiral layer combined with a dielectric layer, both in between a diffraction grating and a screen, are considered. Due to the analytical regularization procedure derived from the Riemann-Hilbert problem method, the correspondent diffraction vector problem is solved in the form available for effective numerical treatment. The numerical investigation shows a number of new diffraction features caused by the chiral medium presence.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"19 15-16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116700941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Relationship between an interval of correlation of echo-signal envelope and turbulence intensity in radar reflecting volume of cloud or precipitation 回波信号包络的相关间隔与雷达反射云或降水的湍流强度的关系
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106886
Y. Khraisat
{"title":"Relationship between an interval of correlation of echo-signal envelope and turbulence intensity in radar reflecting volume of cloud or precipitation","authors":"Y. Khraisat","doi":"10.1109/MMET.2002.1106886","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106886","url":null,"abstract":"The width of the autocorrelation function (ACF) is characterized by the interval of correlation at the 0.5 level, /spl tau//sub 0.5/. The eddy dissipation rate (/spl epsi/) is a fundamental parameter that describes the intensity of turbulence. We use simulation data and build a model of the relationship between the characteristics of a radar echo-signal and parameters of reflecting objects at sample size n=30. The results of calculation with K as a level of a reference of an interval of correlation (K=0.5, /spl lambda/=3.2cm) are presented. We find rather good agreement between the interval of correlation and the intensity of turbulence. The simulation results suggest that sample size n=15 is insufficient for deriving measuring information by using classical algorithms for ACF calculation.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117347904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
An analytical method for construction of single particle electron trajectories in free electron lasers 自由电子激光器中单粒子电子轨迹的解析构造方法
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1107046
K. Ilyenko, B. Yefimov, V. Goryashko, T. Yatsenko
{"title":"An analytical method for construction of single particle electron trajectories in free electron lasers","authors":"K. Ilyenko, B. Yefimov, V. Goryashko, T. Yatsenko","doi":"10.1109/MMET.2002.1107046","DOIUrl":"https://doi.org/10.1109/MMET.2002.1107046","url":null,"abstract":"We apply a method of Linshtedt, also called improved expansion, to solve the equations of motion and obtain single-particle trajectories of electrons moving in crossed static magnetic fields of a hybrid non-relativistic free electron laser. Making use of a natural small parameter, the ratio of the amplitude of spatially periodic magnetic field and the guide magnetic field, one can re-write the motion equations for an electron in a form, which allows their solution by an asymptotic series. In such a way the non-linear frequency shifts and renormalized mean electron velocity are calculated analytically. The analytical results are in a good compared with numerical simulations of the electron trajectories.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127332643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adapted grids for the wavelet-based simulation of complex planar circuits 适用于基于小波的复杂平面电路仿真的网格
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106852
G. Schneider, A. Jacob
{"title":"Adapted grids for the wavelet-based simulation of complex planar circuits","authors":"G. Schneider, A. Jacob","doi":"10.1109/MMET.2002.1106852","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106852","url":null,"abstract":"Wavelets are well-known to accelerate the simulation of planar microwave circuits. In this paper computational savings in both CPU time and memory are discussed that can be achieved by properly implementing a wavelet base for the analysis of complex microstrip circuits. The choice of a suitable grid is discussed for two examples.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126116800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Modeling of electromagnetic field from mobile phone distributed in the human head phantom 手机电磁场在人体头部幻像中的分布建模
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1107016
V. Goblyk, Y. Yakovenko
{"title":"Modeling of electromagnetic field from mobile phone distributed in the human head phantom","authors":"V. Goblyk, Y. Yakovenko","doi":"10.1109/MMET.2002.1107016","DOIUrl":"https://doi.org/10.1109/MMET.2002.1107016","url":null,"abstract":"Modeling of electromagnetic field from a mobile phone distributed in the human head phantom was carried out. The modeling was done by the integral equation method with unknown polarization currents induced by the mobile phone antenna. The induced current distribution was determined in inhomogeneous environment with complex-valued dielectric permittivity.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115525549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Approximated factorizations for kernels involved in the scattering due to a wedge at skew incidence 楔形斜入射散射中涉及的核的近似分解
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106846
V. Daniele, R. Zich
{"title":"Approximated factorizations for kernels involved in the scattering due to a wedge at skew incidence","authors":"V. Daniele, R. Zich","doi":"10.1109/MMET.2002.1106846","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106846","url":null,"abstract":"The theory of the factorization is better mathematically founded in comparison to the theory of the difference equations. This aspect is particularly important when no closed form solutions of the difference equations are available or even possible, and approximated techniques become necessary to overcome the problem. According to the opinion of the authors, approximated factorizations face these problems in a more suitable and effective way. Some approximated factorization techniques related to wedge problems have been addressed.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122313590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
FEM and its generalization for the diffraction by polygonal profile gratings 多边形光栅衍射的有限元法及其推广
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106937
J. Elschner, A. Rathsfeld, G. Schmidt
{"title":"FEM and its generalization for the diffraction by polygonal profile gratings","authors":"J. Elschner, A. Rathsfeld, G. Schmidt","doi":"10.1109/MMET.2002.1106937","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106937","url":null,"abstract":"For the numerical computation of the efficiencies for optical gratings, there exists a huge variety of algorithms. Dealing with a boundary value problem for an elliptic partial differential equation, the application of finite element methods (FEM) is natural also. However, the oscillatory nature of the electromagnetic fields requires some modifications. The resulting FEM program can be used as a part of an algorithm to design optimal gratings.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124701154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Energy transformation of a transient wave on radiating aperture 瞬态波在辐射孔径上的能量转换
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1106857
A. Dumin, V. Katrich
{"title":"Energy transformation of a transient wave on radiating aperture","authors":"A. Dumin, V. Katrich","doi":"10.1109/MMET.2002.1106857","DOIUrl":"https://doi.org/10.1109/MMET.2002.1106857","url":null,"abstract":"Energy transformation of a transient TEM-wave in a coaxial waveguide into energy of reflected and radiated waves on a coaxial aperture is investigated. The radiation problem is solved by means of the modal basis method in the time domain. The analytical expressions for amplitudes of fields radiated into free space and reflected inside the waveguide are obtained for step-wise time dependence of amplitude. of exciting TEM-wave. Time dependencies of instant power of the electromagnetic waves in waveguide and free space are obtained. The analysis of the influence of the problem geometry and exciting signal parameters on effectiveness of radiation is carried out.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114070102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The technique for calculating of HF-signals characteristics taking into consideration ionosphere waveguide propagation 考虑电离层波导传播的高频信号特性计算技术
International Conference on Mathematical Methods in Electromagnetic Theory Pub Date : 2002-09-10 DOI: 10.1109/MMET.2002.1107036
A. Oinats, V. Kurkin, S. Ponomarchuk
{"title":"The technique for calculating of HF-signals characteristics taking into consideration ionosphere waveguide propagation","authors":"A. Oinats, V. Kurkin, S. Ponomarchuk","doi":"10.1109/MMET.2002.1107036","DOIUrl":"https://doi.org/10.1109/MMET.2002.1107036","url":null,"abstract":"A technique based on the waveguide approach for calculating ionosphere oblique-incidence sounding signal characteristics and taking account of ionosphere waveguide excitation is offered. Comparison of our calculation results and experimental ionograms on the path Alice-Springs (Australia) rkutsk (Russia) is given.","PeriodicalId":315649,"journal":{"name":"International Conference on Mathematical Methods in Electromagnetic Theory","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126200075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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