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Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)最新文献

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Maximum likelihood technique for direction of arrival estimation in adaptive arrays 自适应阵列中到达方向估计的最大似然技术
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888562
I.R. Urazgildiyev
{"title":"Maximum likelihood technique for direction of arrival estimation in adaptive arrays","authors":"I.R. Urazgildiyev","doi":"10.1109/MMET.2000.888562","DOIUrl":"https://doi.org/10.1109/MMET.2000.888562","url":null,"abstract":"A direction of arrival estimation technique based on unification of eigenstructure and maximum likelihood estimators is considered. The basic stages of the proposed technique are estimation the number of signals, fast evaluation of the rough initial DOA estimates, and fast accurate definition of the initial ones.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124944894","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
Numerical models in the problems of the scattered fields interaction 散射场相互作用问题的数值模型
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888542
A.B. Hashimov
{"title":"Numerical models in the problems of the scattered fields interaction","authors":"A.B. Hashimov","doi":"10.1109/MMET.2000.888542","DOIUrl":"https://doi.org/10.1109/MMET.2000.888542","url":null,"abstract":"A numerical method is suggested for the analysis of electromagnetic interactions by scattering fields from perfect conducting obstacles. It is based on the using of the cell collocation technique. Parameters of the numerical models are defined by minimizing the regularization functional. Estimates of accuracy for the different obstacles are obtained.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130218733","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
Comparative analysis of approximate and exact solutions of transient wave radiation problems 瞬态波辐射问题近似解与精确解的比较分析
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888521
A.N. Dumin, V. Katrich, S. Pivnenko, O. Tretyakov
{"title":"Comparative analysis of approximate and exact solutions of transient wave radiation problems","authors":"A.N. Dumin, V. Katrich, S. Pivnenko, O. Tretyakov","doi":"10.1109/MMET.2000.888521","DOIUrl":"https://doi.org/10.1109/MMET.2000.888521","url":null,"abstract":"The problem of transient wave radiation from open end of a coaxial waveguide is solved by means of the modal basis method in time domain. The analytical expressions of fields radiated into free space and reflected inside the waveguide are obtained for step-wise time dependence of amplitude of the exciting TEM-wave. The solution for exciting TEM-wave with arbitrary time dependence of amplitude is obtained by calculation of Duhamel's integral. The exact solution of the problem is compared with the same one obtained in Kirchhoff approximation. The spatial and time dependencies of the field radiated from the coaxial aperture are obtained experimentally to examine theoretical results. A comparative analysis of the theoretical and experimental results is made.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130865170","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: 5
Physical and mathematical aspects of some mode matching method modifications 对物理和数学方面的一些模式匹配方法进行修改
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.890475
A. Yushchenko
{"title":"Physical and mathematical aspects of some mode matching method modifications","authors":"A. Yushchenko","doi":"10.1109/MMET.2000.890475","DOIUrl":"https://doi.org/10.1109/MMET.2000.890475","url":null,"abstract":"The effective mathematical approach making possible the understanding of different physical phenomena, which have been observed in complicated waveguide structures, from the standpoint of some properties of a semi-open resonator, based on cut-off waveguide splitters, has been discussed.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131120383","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
The role of excited molecular ions in the variation of the E-layer peak height caused by the solar activity 受激分子离子在太阳活动引起的e层峰高变化中的作用
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.890524
T. Zhivolup
{"title":"The role of excited molecular ions in the variation of the E-layer peak height caused by the solar activity","authors":"T. Zhivolup","doi":"10.1109/MMET.2000.890524","DOIUrl":"https://doi.org/10.1109/MMET.2000.890524","url":null,"abstract":"The data obtained by the Kharkov incoherent scatter radar show a monotonous linear decrease of the E-layer peak height (h/sub m/E) in the transition from the low to medium solar activity. Such behavior of the E-layer peak height is accounted for by the influence of oscillation-excited ions O/sub 2//sup +/ on the h/sub m/E variations depending on the level of solar activity. The theoretical dependences h/sub m/E(F/sub 10.7/) are in a good agreement with the experimental data.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129830185","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
Simulation modeling of statistical characteristics of the radio wave in a layer with random inhomogeneities of dielectric permittivity 介电常数随机非均匀层中无线电波统计特性的仿真建模
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888603
N. T. Afanasiev, S. N. Kolesnik, M. Tinin
{"title":"Simulation modeling of statistical characteristics of the radio wave in a layer with random inhomogeneities of dielectric permittivity","authors":"N. T. Afanasiev, S. N. Kolesnik, M. Tinin","doi":"10.1109/MMET.2000.888603","DOIUrl":"https://doi.org/10.1109/MMET.2000.888603","url":null,"abstract":"This paper presents the methods of generation a random field of dielectric permittivity with a given correlation function. Results are derived from performing a simulation modeling of the mean intensity and a spatial correlation function of the wave field, the dispersion of angles of arrival, and spatial correlation functions of the amplitude and phase of the wave that has propagated through a layer with random inhomogeneities of dielectric permittivity. A comparison is made of the results of calculations of fluctuation characteristics of the radio wave by approximate formulas obtained with the perturbation method with the results of simulation modeling.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130039037","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
Displays of possible harbigers of earthquakes on recordings of VLF-signals depending on their characteristics 根据vlf信号的特征，显示可能的地震前兆
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.890525
N. A. Kazakova, A. G. Kolesnik, B.M. Shinkevich
{"title":"Displays of possible harbigers of earthquakes on recordings of VLF-signals depending on their characteristics","authors":"N. A. Kazakova, A. G. Kolesnik, B.M. Shinkevich","doi":"10.1109/MMET.2000.890525","DOIUrl":"https://doi.org/10.1109/MMET.2000.890525","url":null,"abstract":"A complex of electromagnetic disturbances precedes an earthquake. One of the methods of searching for seismoionospheric effects in the D-region is a radiograph of the Earth-ionosphere waveguide by VLF waves. Such research of of the parameters of the environment allows to obtain additional information about the physical mechanisms of electromagnetic precursors of earthquakes, and the solution of the given problem is directly connected to forecasting possible time intervals between the beginning of preparation and the moment of the earthquake. Records of VLF-signal amplitude show abnormal variations of different intensity above the seismically active region before and after strong earthquakes. The validity of the dependence between the registered disturbances and earthquakes can be experimentally proven either by a statistical method based on general regularities, or by the presence of special characteristics in the signal, inherent to the specific process with regard to the geophysical conditions as a whole.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130262616","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
Fractionalization methods and their applications to radiation and scattering problems 分馏方法及其在辐射和散射问题中的应用
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888504
N. Engheta
{"title":"Fractionalization methods and their applications to radiation and scattering problems","authors":"N. Engheta","doi":"10.1109/MMET.2000.888504","DOIUrl":"https://doi.org/10.1109/MMET.2000.888504","url":null,"abstract":"Exploring the possible links between the mathematical field of fractional calculus and the electromagnetic theory has been one of the topics of our research interests. We have studied the possibility of bringing the tools of fractional calculus and electromagnetic theory together, and have explored and developed the topic of fractional paradigm in electromagnetic theory. Fractional calculus is a branch of mathematics that addresses the mathematical properties of operation of fractional differentiation and fractional integration operators involving derivatives and integrals to arbitrary non-integer orders. We have applied the tools of fractional calculus in various problems in electromagnetic fields and waves, and have obtained interesting results that highlight certain notable features and promising potential applications of these operators in electromagnetic theory. Moreover, since fractional derivatives/integrals are effectively the result of fractionalization of differentiation and integration operators, we have investigated the notion of fractionalization of some other linear operators in electromagnetic theory. Searching for such operator fractionalization has led us to interesting solutions in radiation and scattering problems.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"387 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116495051","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: 11
The scattering by a perfectly conducting paraboloid of rotation with an absorbing coating of the edges 由边缘有吸收涂层的完全导电的旋转抛物面散射
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.890462
S. Nechitaylo, S.V. Orekhov, K. Tkachuk
{"title":"The scattering by a perfectly conducting paraboloid of rotation with an absorbing coating of the edges","authors":"S. Nechitaylo, S.V. Orekhov, K. Tkachuk","doi":"10.1109/MMET.2000.890462","DOIUrl":"https://doi.org/10.1109/MMET.2000.890462","url":null,"abstract":"The plane electromagnetic wave scattering by perfectly conducting paraboloid of rotation with toroidal absorbing coating of edge is considered. The calculation method is based on combination of the solution (in the near-field zone) of the model problem of the plane electromagnetic wave scattering by perfectly conducting wedge with absorbing cylinder on the edge and asymptotic high-frequency methods. Calculation results are presented.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116500925","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
Successive approximation method for the linear system of double longitudinal slots in a rectangular waveguide 矩形波导双纵槽线性系统的逐次逼近方法
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.890472
N. Blinova, A. V. Zhironkina, L. Yatsuk
{"title":"Successive approximation method for the linear system of double longitudinal slots in a rectangular waveguide","authors":"N. Blinova, A. V. Zhironkina, L. Yatsuk","doi":"10.1109/MMET.2000.890472","DOIUrl":"https://doi.org/10.1109/MMET.2000.890472","url":null,"abstract":"An efficient approximation method is used to calculate energetic parameters and amplitude-phase distribution along a linear waveguide-slot antenna with double longitudinal slots in a broad wall of a rectangular waveguide having an arbitrary end loading. The approach is used when the E-field in slots is approximated with only one sinusoidal function. The mutual coupling of the slots over a waveguide and free space is taken into account, as well as the thickness of a waveguide wall and dielectric filling of the slots.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"285 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131781517","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
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