Pub Date : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428266
E. Ibatoulline
In this report, the use of iterative method of maximum likelihood is considered, which common algorithm was circumscribed earlier, for the parameter estimation of the non-Gaussian probability density of one-dimensional signals and interferences. The formulas for determination of means and variances maximizing the logarithms of private likelihood functions are obtained. The simulation is carried out and the numerical results indicating good the capabilities of method are obtained
{"title":"Parameter estimation of non-Gaussian probability density of one-dimensional signals and interferences by iterative method of maximum likelihood","authors":"E. Ibatoulline","doi":"10.1109/ICSMC2.2003.1428266","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428266","url":null,"abstract":"In this report, the use of iterative method of maximum likelihood is considered, which common algorithm was circumscribed earlier, for the parameter estimation of the non-Gaussian probability density of one-dimensional signals and interferences. The formulas for determination of means and variances maximizing the logarithms of private likelihood functions are obtained. The simulation is carried out and the numerical results indicating good the capabilities of method are obtained","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115468959","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 : 2003-05-16DOI: 10.1142/9789812702593_0012
P. P. Lemos, A. Magoulas, D. Peppas, I. K. Hatzilau
In the present paper an approach to investigate the shape dependence of a perfect axissymetric scatterer and especially a spheroid, with relation to its scattered electromagnetic field is attempted. For this investigation a spheroid has been selected with varying ratio of its dimensions. The investigation is based on the principle of maintaining the scatterers area constant while changing its shape from oblate to spherical and then to prolate. For this purpose, the method of moments with the use of numerical electromagnetics code (NEC) and a hybrid method are applied and the results of the bistatic and monostatic radar cross section computations are analyzed and presented. For these spheroids, it is shown that when the incident plane wave travels towards the -z axis, there are some elevation angle regions that the radar cross section of the bodies keeps to remain in very low levels even when the ratio of the spheroids' dimensions change
{"title":"Shape dependence of the scattered electromagnetic field of spheroidal perfect scatterers","authors":"P. P. Lemos, A. Magoulas, D. Peppas, I. K. Hatzilau","doi":"10.1142/9789812702593_0012","DOIUrl":"https://doi.org/10.1142/9789812702593_0012","url":null,"abstract":"In the present paper an approach to investigate the shape dependence of a perfect axissymetric scatterer and especially a spheroid, with relation to its scattered electromagnetic field is attempted. For this investigation a spheroid has been selected with varying ratio of its dimensions. The investigation is based on the principle of maintaining the scatterers area constant while changing its shape from oblate to spherical and then to prolate. For this purpose, the method of moments with the use of numerical electromagnetics code (NEC) and a hybrid method are applied and the results of the bistatic and monostatic radar cross section computations are analyzed and presented. For these spheroids, it is shown that when the incident plane wave travels towards the -z axis, there are some elevation angle regions that the radar cross section of the bodies keeps to remain in very low levels even when the ratio of the spheroids' dimensions change","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130119186","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428340
N. Taavousi, R. Moini, S. Sadeghi
A new technique based on an artificial neural network (ANN) is proposed to locate cloud-to-ground lightning return stroke channels (RSCs). The technique uses a two-layer resilient backpropagation neural network to estimate the RSC-to-measuring station distance. The training of the implemented ANN is based on simulated electric field data, using the model of modified transmission line (MTL) for lightning RSC. The performance of the proposed technique is evaluated by applying it to real measured data given by Lin et al, 1979. It is shown that the technique predicts the location of RSC more accurately when the data associated with the subsequent return stroke are used. This stems from the fact the MTL model of RSC used in the training of the ANN is closer to the second return stroke than the first one
{"title":"An improved neuro-based approach for locating cloud-to-ground lightning using radiated electric field waveform data","authors":"N. Taavousi, R. Moini, S. Sadeghi","doi":"10.1109/ICSMC2.2003.1428340","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428340","url":null,"abstract":"A new technique based on an artificial neural network (ANN) is proposed to locate cloud-to-ground lightning return stroke channels (RSCs). The technique uses a two-layer resilient backpropagation neural network to estimate the RSC-to-measuring station distance. The training of the implemented ANN is based on simulated electric field data, using the model of modified transmission line (MTL) for lightning RSC. The performance of the proposed technique is evaluated by applying it to real measured data given by Lin et al, 1979. It is shown that the technique predicts the location of RSC more accurately when the data associated with the subsequent return stroke are used. This stems from the fact the MTL model of RSC used in the training of the ANN is closer to the second return stroke than the first one","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"41 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128555321","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428216
M. Hussein, A. Hamid
The radiation properties of axially slotted elliptical antenna coated by a lossy dielectric material are investigated. The analysis is carried out by expressing the fields outside the antenna structure (free space) and inside the lossy dielectric coating in terms of elliptic waves via Mathieu functions, then boundary conditions are employed to solve for the unknown expansion coefficients. Numerical results are presented in graphical form for the transverse magnetic (TM) case to illustrate the radiation pattern, the aperture conductance, and the gain against the coating thickness
{"title":"Radiation by axial slot elliptical antenna coated by a lossy dielectric material","authors":"M. Hussein, A. Hamid","doi":"10.1109/ICSMC2.2003.1428216","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428216","url":null,"abstract":"The radiation properties of axially slotted elliptical antenna coated by a lossy dielectric material are investigated. The analysis is carried out by expressing the fields outside the antenna structure (free space) and inside the lossy dielectric coating in terms of elliptic waves via Mathieu functions, then boundary conditions are employed to solve for the unknown expansion coefficients. Numerical results are presented in graphical form for the transverse magnetic (TM) case to illustrate the radiation pattern, the aperture conductance, and the gain against the coating thickness","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124608097","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428191
A. Kazemipour, D. Allal, X. Begaud, F. Piquemal
This paper addresses the adequacy of the measurement methodology of "three antennas method" of ANSI Standard C63.5. This method requires installing at least one of the three antennas under test, on two different heights i.e. transmission and receiving positions. Although it presents a unique AF for each antenna at its receiving or transmitting position. We propose here a modified method to evaluate the AF of all the three antennas on their two different heights i.e. transmission and receiving positions, in a series of six measurements
{"title":"Modified \"three antennas method\" for determining the antenna factor (AF)","authors":"A. Kazemipour, D. Allal, X. Begaud, F. Piquemal","doi":"10.1109/ICSMC2.2003.1428191","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428191","url":null,"abstract":"This paper addresses the adequacy of the measurement methodology of \"three antennas method\" of ANSI Standard C63.5. This method requires installing at least one of the three antennas under test, on two different heights i.e. transmission and receiving positions. Although it presents a unique AF for each antenna at its receiving or transmitting position. We propose here a modified method to evaluate the AF of all the three antennas on their two different heights i.e. transmission and receiving positions, in a series of six measurements","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"156 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120895161","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428208
J. Yun
The author describes an optimized straight CTL cell whose uniform area is 2cm times 2cm and field uniformity is plusmn1 dB to calibrate small EM field probes in air. We could obtain the cell with the broadband frequency range up to 2.1 GHz. The field uniformity and frequency range of the cell are compared with those of square type CTL cell and symmetric TEM cell with same test zone in this paper. It is shown that the optimized CTL cell can provide the standard EM fields with broadband frequency range. The measured electric fields and resonant frequencies of the designed CTL cell agree well with the simulated results by moment methods (MM) and variational method (VM) respectively
{"title":"Optimized straight CTL cell to calibrate EM field probes in air up to 2.1 GHz","authors":"J. Yun","doi":"10.1109/ICSMC2.2003.1428208","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428208","url":null,"abstract":"The author describes an optimized straight CTL cell whose uniform area is 2cm times 2cm and field uniformity is plusmn1 dB to calibrate small EM field probes in air. We could obtain the cell with the broadband frequency range up to 2.1 GHz. The field uniformity and frequency range of the cell are compared with those of square type CTL cell and symmetric TEM cell with same test zone in this paper. It is shown that the optimized CTL cell can provide the standard EM fields with broadband frequency range. The measured electric fields and resonant frequencies of the designed CTL cell agree well with the simulated results by moment methods (MM) and variational method (VM) respectively","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117228972","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428259
J. Vázquez, E. Olías, A. Barrado, J. Pleite
Continuous measurements of the electromagnetic field strength reveal variations that are not observed in the 6' average period stipulated in CENELEC ENV 50166-2. Several examples are presented here of prolonged measurements at different places and conditions, using a wide band E field meter. Taking each record as a time series, its power spectra were analyzed by means of wavelets. This showed the existence of several cycles, mainly of 24 hours. These oscillations shows that people are normally exposed to a low level field of amplitude modulated by an extremely low frequency, of which the effects are unknown
{"title":"Assessment of the environmental electromagnetic field by time series of continuous measurements","authors":"J. Vázquez, E. Olías, A. Barrado, J. Pleite","doi":"10.1109/ICSMC2.2003.1428259","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428259","url":null,"abstract":"Continuous measurements of the electromagnetic field strength reveal variations that are not observed in the 6' average period stipulated in CENELEC ENV 50166-2. Several examples are presented here of prolonged measurements at different places and conditions, using a wide band E field meter. Taking each record as a time series, its power spectra were analyzed by means of wavelets. This showed the existence of several cycles, mainly of 24 hours. These oscillations shows that people are normally exposed to a low level field of amplitude modulated by an extremely low frequency, of which the effects are unknown","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115758060","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428245
O. Saracoglu, R. Kılıç
This paper deals with the investigation EMI effects in autonomous Chua's chaotic circuit. We did this investigation by applying a 5 MHz-30 MHz/100mV EMI signal to one of the input pin of op-amps used for realizing nonlinear resistor in Chua's circuit. In addition, we also investigated whether EMI signals affect the chaos synchronization between two Chua's chaotic circuits or not
{"title":"A simulation study on EMI effects in autonomous Chua's chaotic circuit","authors":"O. Saracoglu, R. Kılıç","doi":"10.1109/ICSMC2.2003.1428245","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428245","url":null,"abstract":"This paper deals with the investigation EMI effects in autonomous Chua's chaotic circuit. We did this investigation by applying a 5 MHz-30 MHz/100mV EMI signal to one of the input pin of op-amps used for realizing nonlinear resistor in Chua's circuit. In addition, we also investigated whether EMI signals affect the chaos synchronization between two Chua's chaotic circuits or not","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126184149","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428345
A. Raymond, V. Lyandres, R.C. Santiago
As the demand for bandwidth in cellular communications grows rapidly, fast and effective frequency assignment algorithms are becoming a very critical item in the design process. We consider a realistic radio network with non equal cells and non uniform traffic and propose a stochastic algorithm for the search of a quasi optimal solution for the corresponding frequency assignment problem. The algorithm represents certain modification of the known guided genetic algorithm and is rather fast due to the fact that it escapes local minimums and on the other hand spends more time in the spots with the highest conflict
{"title":"On a guided genetic algorithm for frequency assignment in nonhomogeneous cellular networks","authors":"A. Raymond, V. Lyandres, R.C. Santiago","doi":"10.1109/ICSMC2.2003.1428345","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428345","url":null,"abstract":"As the demand for bandwidth in cellular communications grows rapidly, fast and effective frequency assignment algorithms are becoming a very critical item in the design process. We consider a realistic radio network with non equal cells and non uniform traffic and propose a stochastic algorithm for the search of a quasi optimal solution for the corresponding frequency assignment problem. The algorithm represents certain modification of the known guided genetic algorithm and is rather fast due to the fact that it escapes local minimums and on the other hand spends more time in the spots with the highest conflict","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130713576","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 : 2003-05-16DOI: 10.1109/ICSMC2.2003.1428231
K. Tanabe, A. Asakawa
It is important to study the transient performance of grounding systems for lightning surges in order to realize electromagnetic compatibility (EMC) of sensitive electronics, such as information devices and digital relays in substations and/or residential houses. Grounding grids of buried conductors are considered as the most effective solution for grounding systems of high-voltage substations and large plants, and buried earth rings are effective solutions for grounding systems of communication buildings and residential houses. In this paper, computer analysis based on the finite-difference time-domain (FDTD) method and experimental results of the transient performance with respect to a grounding grid element, which is also considered as a buried earth ring, are presented and it is confirmed that the novel simulation method is practical for analyzing the transient performance of the grounding grids through comparison of experimental and analytical results
{"title":"Computer analysis of transient performance of grounding grid element based on the finite-difference time-domain method","authors":"K. Tanabe, A. Asakawa","doi":"10.1109/ICSMC2.2003.1428231","DOIUrl":"https://doi.org/10.1109/ICSMC2.2003.1428231","url":null,"abstract":"It is important to study the transient performance of grounding systems for lightning surges in order to realize electromagnetic compatibility (EMC) of sensitive electronics, such as information devices and digital relays in substations and/or residential houses. Grounding grids of buried conductors are considered as the most effective solution for grounding systems of high-voltage substations and large plants, and buried earth rings are effective solutions for grounding systems of communication buildings and residential houses. In this paper, computer analysis based on the finite-difference time-domain (FDTD) method and experimental results of the transient performance with respect to a grounding grid element, which is also considered as a buried earth ring, are presented and it is confirmed that the novel simulation method is practical for analyzing the transient performance of the grounding grids through comparison of experimental and analytical results","PeriodicalId":272545,"journal":{"name":"2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03.","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130897587","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}
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