DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)最新文献
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822144
D. Kuryliak, Z. Nazarchuk
The analysis of electromagnetic wave scattering by finite metallic conical screens has received much attention in connection with prediction of the radar cross section of a target. This problem serves as a simple model of horn antennas and materials defects. We consider the scalar wave diffraction by a perfectly conducting finite cone as a basic problem for the given geometry and analyze the scattering field patterns. The considered approach is based on the exact analytical inversion of the asymptote of the infinite system of linear algebraic equations.
{"title":"Rigorous analysis of axial symmetric wave diffraction by finite conical screen","authors":"D. Kuryliak, Z. Nazarchuk","doi":"10.1109/DIPED.1999.822144","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822144","url":null,"abstract":"The analysis of electromagnetic wave scattering by finite metallic conical screens has received much attention in connection with prediction of the radar cross section of a target. This problem serves as a simple model of horn antennas and materials defects. We consider the scalar wave diffraction by a perfectly conducting finite cone as a basic problem for the given geometry and analyze the scattering field patterns. The considered approach is based on the exact analytical inversion of the asymptote of the infinite system of linear algebraic equations.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130758952","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822137
G. Bit‐Babik, P. Shubitidze, R. Zaridze, D. Karkashadze, K. Tavzarashvili, A. Bijamov
The modification of the method of auxiliary sources (MAS) for solving the electromagnetic (EM) diffraction problems is discussed. The presented approach explores the integrated auxiliary sources reducing in may cases the number of unknowns of a particular problem. This is especially important for scattering problems on open structures, scatterers with thin geometry, dielectric scatterers with very high permittivity. The results of particular problems solution are presented to demonstrate the capabilities of the method (e.g. diffraction on thin dielectric parallelepiped and scattering by perfectly conducting cube with one open side).
{"title":"Generalized method of auxiliary sources (integrated auxiliary sources)","authors":"G. Bit‐Babik, P. Shubitidze, R. Zaridze, D. Karkashadze, K. Tavzarashvili, A. Bijamov","doi":"10.1109/DIPED.1999.822137","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822137","url":null,"abstract":"The modification of the method of auxiliary sources (MAS) for solving the electromagnetic (EM) diffraction problems is discussed. The presented approach explores the integrated auxiliary sources reducing in may cases the number of unknowns of a particular problem. This is especially important for scattering problems on open structures, scatterers with thin geometry, dielectric scatterers with very high permittivity. The results of particular problems solution are presented to demonstrate the capabilities of the method (e.g. diffraction on thin dielectric parallelepiped and scattering by perfectly conducting cube with one open side).","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115459492","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822131
S.M. Yaroshko, S.A. Yaroshko
To solve the eigenvalue problem with a completely continuous operator the modified successive approximation method is used. A method to estimate the linear part of the calculation errors is proposed. The questions of a priori estimation of the calculated characteristic numbers of the operator is discussed.
{"title":"Error estimation of characteristic numbers in the modified successive approximation method","authors":"S.M. Yaroshko, S.A. Yaroshko","doi":"10.1109/DIPED.1999.822131","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822131","url":null,"abstract":"To solve the eigenvalue problem with a completely continuous operator the modified successive approximation method is used. A method to estimate the linear part of the calculation errors is proposed. The questions of a priori estimation of the calculated characteristic numbers of the operator is discussed.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115614451","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822120
A. Ramm
Summary form only given, as follows. An overview of the author's results is given. The inverse problems for obstacle, geophysical and potential scattering are considered. The basic method for proving uniqueness theorems in one- and multi-dimensional inverse problems is discussed and illustrated by numerous examples. The method is based on property C for pairs of differential operators. Property C stands for completeness of the sets of products of solutions to homogeneous differential equations. To prove a uniqueness theorem in the inverse scattering problem one assumes that there are two operators which generate the same scattering data. This assumption allows one to derive an orthogonality relation from which, via property C, the uniqueness theorem follows. New results are discussed. These include property C for ordinary differential equations, inversion of I-function (impedance function), inversion of incomplete scattering data (for example, the phase shift of s-wave without the knowledge of bound states and norming constants but assuming a priori that the potential has compact support, etc). Analytical solution of the ground-penetrating radar problem is outlined. Open problems are formulated.
{"title":"Multidimensional inverse scattering problems","authors":"A. Ramm","doi":"10.1109/DIPED.1999.822120","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822120","url":null,"abstract":"Summary form only given, as follows. An overview of the author's results is given. The inverse problems for obstacle, geophysical and potential scattering are considered. The basic method for proving uniqueness theorems in one- and multi-dimensional inverse problems is discussed and illustrated by numerous examples. The method is based on property C for pairs of differential operators. Property C stands for completeness of the sets of products of solutions to homogeneous differential equations. To prove a uniqueness theorem in the inverse scattering problem one assumes that there are two operators which generate the same scattering data. This assumption allows one to derive an orthogonality relation from which, via property C, the uniqueness theorem follows. New results are discussed. These include property C for ordinary differential equations, inversion of I-function (impedance function), inversion of incomplete scattering data (for example, the phase shift of s-wave without the knowledge of bound states and norming constants but assuming a priori that the potential has compact support, etc). Analytical solution of the ground-penetrating radar problem is outlined. Open problems are formulated.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114569488","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822122
D. Shepelsky
An inverse problem for a non-homogeneous (stratified) dispersive chiral slab is considered in the frequency domain. The problem is treated as a holomorphic factorization problem in the frequency complex plane. The reconstruction algorithm is based on the reformulation of the scattering problem as a Riemann-Hilbert problem. Uniqueness in the parameter reconstruction under normal incidence of the exciting waves is studied.
{"title":"Inverse scattering problem for a stratified dispersive chiral medium","authors":"D. Shepelsky","doi":"10.1109/DIPED.1999.822122","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822122","url":null,"abstract":"An inverse problem for a non-homogeneous (stratified) dispersive chiral slab is considered in the frequency domain. The problem is treated as a holomorphic factorization problem in the frequency complex plane. The reconstruction algorithm is based on the reformulation of the scattering problem as a Riemann-Hilbert problem. Uniqueness in the parameter reconstruction under normal incidence of the exciting waves is studied.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"17 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124360352","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822154
L.M. Pasnak, P. Savenko
We consider the synthesis problem of an antenna array, which consists of thin wire radiators, through the given amplitude directivity pattern (DP) taking into account the mutual coupling of radiators and the vector character of the electromagnetic field. The regularization functional, which regards the mean-square deviations of components of the synthesis and the given magnitudes, and the limitation on the norm of extrinsic currents, is used as a criterion of optimization. The numerical solution of the synthesis problem is reduced to finding solutions of the nonlinear system of algebraic equations. In the iterative process we implement an implicit scheme of the successive approximation method. The analysis problem is reduced to a system of linear integral Poklington type equations. The example of the synthesis of an antenna array with conical two-arm spiral radiators is presented.
{"title":"Numerical solving of the synthesis problem of conical spiral antenna array with regard the mutual coupling","authors":"L.M. Pasnak, P. Savenko","doi":"10.1109/DIPED.1999.822154","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822154","url":null,"abstract":"We consider the synthesis problem of an antenna array, which consists of thin wire radiators, through the given amplitude directivity pattern (DP) taking into account the mutual coupling of radiators and the vector character of the electromagnetic field. The regularization functional, which regards the mean-square deviations of components of the synthesis and the given magnitudes, and the limitation on the norm of extrinsic currents, is used as a criterion of optimization. The numerical solution of the synthesis problem is reduced to finding solutions of the nonlinear system of algebraic equations. In the iterative process we implement an implicit scheme of the successive approximation method. The analysis problem is reduced to a system of linear integral Poklington type equations. The example of the synthesis of an antenna array with conical two-arm spiral radiators is presented.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132657147","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822142
A. Boryssenko
This paper presents a 2-D scalar numerical time-domain model with evident physical meaning for simulation of electromagnetic diffraction in the act of electromagnetic sounding implemented by ground-penetrating microwave radar. The data obtained as a result of the radar survey should be interpreted for detection, discrimination and location of hidden objects caused scattering phenomena. The proposed approach allows consideration of the basic physical principles, governing these physical events to form an electromagnetic image of the subsurface region with simulated radar returns. It can also be applied to real radar image processing.
{"title":"Time-domain diffraction phenomena simulation for subsurface electromagnetic sounding","authors":"A. Boryssenko","doi":"10.1109/DIPED.1999.822142","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822142","url":null,"abstract":"This paper presents a 2-D scalar numerical time-domain model with evident physical meaning for simulation of electromagnetic diffraction in the act of electromagnetic sounding implemented by ground-penetrating microwave radar. The data obtained as a result of the radar survey should be interpreted for detection, discrimination and location of hidden objects caused scattering phenomena. The proposed approach allows consideration of the basic physical principles, governing these physical events to form an electromagnetic image of the subsurface region with simulated radar returns. It can also be applied to real radar image processing.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125622089","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822140
F. Bogdanov, D. Karkashadze, D. A. Metskhvarishvili
The full-mode electrodynamic analysis together with numerical experiments are used to design a passband microwave filter with the desired characteristics. The advantage of this approach compared with circuit element techniques is shown.
{"title":"Design of direct-coupled cavity microwave filters using full-mode electrodynamic analysis","authors":"F. Bogdanov, D. Karkashadze, D. A. Metskhvarishvili","doi":"10.1109/DIPED.1999.822140","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822140","url":null,"abstract":"The full-mode electrodynamic analysis together with numerical experiments are used to design a passband microwave filter with the desired characteristics. The advantage of this approach compared with circuit element techniques is shown.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131376480","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822139
K. Tavzarashvili, R. Zaridze, G. Bit‐Babik, A. Bijamov
The role of scattered field singularities in the solution of EM scattering problems by the method of auxiliary sources is discussed. The example of a hyperbolic surface when the scattered field singularities are mainly located in a single point and the scattered field is represented by a single auxiliary source is presented.
{"title":"Singularities of scattered field","authors":"K. Tavzarashvili, R. Zaridze, G. Bit‐Babik, A. Bijamov","doi":"10.1109/DIPED.1999.822139","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822139","url":null,"abstract":"The role of scattered field singularities in the solution of EM scattering problems by the method of auxiliary sources is discussed. The example of a hyperbolic surface when the scattered field singularities are mainly located in a single point and the scattered field is represented by a single auxiliary source is presented.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121155935","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}
Pub Date : 1900-01-01DOI: 10.1109/DIPED.1999.822143
A. Boryssenko
This paper reviews topics concerning processing of electromagnetic and acoustic signals with some features resulted from their propagation through a real channel where multipath propagation occurs. The processing algorithm should be used to solve the inverse problem of restoring the signal, which is distorted by the channel. This algorithm, implemented by a time-reversal or non-linear echo-based concept, is discussed.
{"title":"Time-reversal algorithm for wave inverse problems in channels with multipath non-stable propagation","authors":"A. Boryssenko","doi":"10.1109/DIPED.1999.822143","DOIUrl":"https://doi.org/10.1109/DIPED.1999.822143","url":null,"abstract":"This paper reviews topics concerning processing of electromagnetic and acoustic signals with some features resulted from their propagation through a real channel where multipath propagation occurs. The processing algorithm should be used to solve the inverse problem of restoring the signal, which is distorted by the channel. This algorithm, implemented by a time-reversal or non-linear echo-based concept, is discussed.","PeriodicalId":426777,"journal":{"name":"DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130067152","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}
DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)
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