Pub Date : 2016-08-01DOI: 10.1109/URSI-EMTS.2016.7571530
D. Haor, R. Shavit, A. Geva
In this work, a new cortical potential imaging (CPI) method is presented. The potential distribution on the scalp is back-projected to the cortex surface using an electrostatic propagation mechanism. Combining the information from MRI derived realistic head conductivity model and the ability of the surface Laplacian (SL) to estimate the cortical normal currents, together with the finite element method (FEM) we illustrate the back-projection CPI (BP-CPI) which gives a simple, fast, high-resolution and accurate CPI, solved in only one iteration. In this paper we describe the new method and show simulative validation results. The BP-CPI was designed for easy integration with monitoring and stimulation tools for better understanding the underlying cortical activity.
{"title":"Back-projected cortical potential imaging for monitoring and stimulation tools","authors":"D. Haor, R. Shavit, A. Geva","doi":"10.1109/URSI-EMTS.2016.7571530","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571530","url":null,"abstract":"In this work, a new cortical potential imaging (CPI) method is presented. The potential distribution on the scalp is back-projected to the cortex surface using an electrostatic propagation mechanism. Combining the information from MRI derived realistic head conductivity model and the ability of the surface Laplacian (SL) to estimate the cortical normal currents, together with the finite element method (FEM) we illustrate the back-projection CPI (BP-CPI) which gives a simple, fast, high-resolution and accurate CPI, solved in only one iteration. In this paper we describe the new method and show simulative validation results. The BP-CPI was designed for easy integration with monitoring and stimulation tools for better understanding the underlying cortical activity.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129377403","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360407
G. Kolezas, G. P. Zouros, J. Roumeliotis
A closed-form solution for the electromagnetic scattering of a plane wave by a perfectly conducting body of revolution (BoR) is presented in this work. The BoR is considered as a shape perturbation of a sphere and the solution is obtained using asymptotic expansions, for small values of a perturbation parameter h. Our method is validated by comparison to another independent numerical technique and various numerical results are given.
{"title":"Asymptotic technique for electromagnetic scattering by perfectly conducting bodies of revolution","authors":"G. Kolezas, G. P. Zouros, J. Roumeliotis","doi":"10.1109/COMCAS.2015.7360407","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360407","url":null,"abstract":"A closed-form solution for the electromagnetic scattering of a plane wave by a perfectly conducting body of revolution (BoR) is presented in this work. The BoR is considered as a shape perturbation of a sphere and the solution is obtained using asymptotic expansions, for small values of a perturbation parameter h. Our method is validated by comparison to another independent numerical technique and various numerical results are given.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114669561","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360377
R. Zaridze, V. Tabatadze, I. Petoev, T. Tchabukiani
By means of the scattered field singularities localization, optimal antenna synthesis problem solution with predefined pattern directivity is considered. Using the analytical continuation of the scattered field, along and backwards its propagation, could be determined the positions of their singularities. Determining the coordinates of these singularity points with appropriate polarization and placing in these points the field sources as a corresponding currents, we get the desired directional pattern. Numerical realization of described above algorithm showed ability to determine the positions of the scattered field singularities of the given pattern and the possibility to find optimal distribution of the currents, which creates the predefined far field's pattern.
{"title":"Optimal antenna synthesis problem solution using the method of auxiliary sources","authors":"R. Zaridze, V. Tabatadze, I. Petoev, T. Tchabukiani","doi":"10.1109/COMCAS.2015.7360377","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360377","url":null,"abstract":"By means of the scattered field singularities localization, optimal antenna synthesis problem solution with predefined pattern directivity is considered. Using the analytical continuation of the scattered field, along and backwards its propagation, could be determined the positions of their singularities. Determining the coordinates of these singularity points with appropriate polarization and placing in these points the field sources as a corresponding currents, we get the desired directional pattern. Numerical realization of described above algorithm showed ability to determine the positions of the scattered field singularities of the given pattern and the possibility to find optimal distribution of the currents, which creates the predefined far field's pattern.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125122859","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360497
Dale F. Reding
Maritime Information Warfare (MIW) provides a unifying concept for the integration, within naval operations, of information; command and control (C2); intelligence, surveillance and reconnaissance (ISR); electronic warfare (EW); and cyber systems. MIW leverages the plethora of socio-technical networks, sensors and information sources (e.g. terrestrial, space based, open sources) to support the development of a multilayered, multi-domain operational maritime picture. However, modern navies are relentlessly challenged by the rapid changes in communications; sensors; signal processing; information management; and, imaging technologies. To illustrate the MIW R&D challenges and opportunities facing the Royal Canadian Navy (RCN), this presentation highlights some of the concepts and technologies being explored within the current research program. This will include new sensors and information management technologies being developed within Defence R&D Canada. This research will be exploited to ensure optimal operational and tactical level decisions for both independent and coalition maritime operations in domestic and global theatres; and, support Command's ability to maintain both effective and technologically relevant Command Decision Support and Control.
{"title":"The technological challenges of maritime information warfare","authors":"Dale F. Reding","doi":"10.1109/COMCAS.2015.7360497","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360497","url":null,"abstract":"Maritime Information Warfare (MIW) provides a unifying concept for the integration, within naval operations, of information; command and control (C2); intelligence, surveillance and reconnaissance (ISR); electronic warfare (EW); and cyber systems. MIW leverages the plethora of socio-technical networks, sensors and information sources (e.g. terrestrial, space based, open sources) to support the development of a multilayered, multi-domain operational maritime picture. However, modern navies are relentlessly challenged by the rapid changes in communications; sensors; signal processing; information management; and, imaging technologies. To illustrate the MIW R&D challenges and opportunities facing the Royal Canadian Navy (RCN), this presentation highlights some of the concepts and technologies being explored within the current research program. This will include new sensors and information management technologies being developed within Defence R&D Canada. This research will be exploited to ensure optimal operational and tactical level decisions for both independent and coalition maritime operations in domestic and global theatres; and, support Command's ability to maintain both effective and technologically relevant Command Decision Support and Control.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125761883","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360400
D. Rieth, C. Heller, G. Ascheid
Due to spectral finiteness and energy limitations, there is an undiminished attractiveness of Continuous Phase Modulations (CPMs), where Shaped Offset QPSK (SOQPSK) is a particularly well suited example in this class of single carrier and constant envelope waveforms to tackle these restrictions. A broad variety of wireless communication systems, such as deep-space, Unmanned Aerial Vehicle (UAV) and telemetry links are applications that benefit from the properties of these modulations. Based on an analysis of SOQPSK's binary to ternary precoder rules and their effect on the signal's spectrum, a new precoding technique is derived in this paper, to incorporate into the modulated signal more than one bit per symbol. The result is Constrained Ternary Precoded CPM (CTP-CPM), a novel modulation technique with a 25% increase in spectral efficiency compared to SOQPSK, usable to enlarge the data rate without spectrum modification, or to decrease the required radio frequency bandwidth for a given data rate.
{"title":"A novel modulation technique for spectral efficiency enhancement of ternary precoded Continuous Phase Modulation","authors":"D. Rieth, C. Heller, G. Ascheid","doi":"10.1109/COMCAS.2015.7360400","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360400","url":null,"abstract":"Due to spectral finiteness and energy limitations, there is an undiminished attractiveness of Continuous Phase Modulations (CPMs), where Shaped Offset QPSK (SOQPSK) is a particularly well suited example in this class of single carrier and constant envelope waveforms to tackle these restrictions. A broad variety of wireless communication systems, such as deep-space, Unmanned Aerial Vehicle (UAV) and telemetry links are applications that benefit from the properties of these modulations. Based on an analysis of SOQPSK's binary to ternary precoder rules and their effect on the signal's spectrum, a new precoding technique is derived in this paper, to incorporate into the modulated signal more than one bit per symbol. The result is Constrained Ternary Precoded CPM (CTP-CPM), a novel modulation technique with a 25% increase in spectral efficiency compared to SOQPSK, usable to enlarge the data rate without spectrum modification, or to decrease the required radio frequency bandwidth for a given data rate.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123521163","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360383
I. Klein, Y. Bar-Shalom, Yeshaya Lipman
Target tracking with multiple synchronous passive sensors is well studied in the literature. If the LOS measurements are not synchronized, the formation of composite measurements (full position) requires at least three LOS. In this paper, we examine the case where the sensors initiate tracking with a random constant offset. Furthermore, to validate the numerical results on the required number of LOS for both synchronous and asynchronous measurements, an analytical proof is provided.
{"title":"Observability conditions for fusion of asynchronous measurements from multiple passive sensors","authors":"I. Klein, Y. Bar-Shalom, Yeshaya Lipman","doi":"10.1109/COMCAS.2015.7360383","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360383","url":null,"abstract":"Target tracking with multiple synchronous passive sensors is well studied in the literature. If the LOS measurements are not synchronized, the formation of composite measurements (full position) requires at least three LOS. In this paper, we examine the case where the sensors initiate tracking with a random constant offset. Furthermore, to validate the numerical results on the required number of LOS for both synchronous and asynchronous measurements, an analytical proof is provided.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114410748","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360429
L. Anishchenko
In present work we discuss the usage of empirical mode decomposition algorithm for bioradar data processing. The algorithm of data processing is considered and the value of the threshold criteria is chosen according to the results of the experimental data processing. It is shown that preprocessing of raw bioradar data, which compensate the difference in amplitude of breathing and heartbeat signals, increases the effectiveness of empirical mode decomposition algorithm in bioradar data processing.
{"title":"Empirical mode decomposition algorithm for bioradar data analysis","authors":"L. Anishchenko","doi":"10.1109/COMCAS.2015.7360429","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360429","url":null,"abstract":"In present work we discuss the usage of empirical mode decomposition algorithm for bioradar data processing. The algorithm of data processing is considered and the value of the threshold criteria is chosen according to the results of the experimental data processing. It is shown that preprocessing of raw bioradar data, which compensate the difference in amplitude of breathing and heartbeat signals, increases the effectiveness of empirical mode decomposition algorithm in bioradar data processing.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116314512","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360359
M. Kulygin, S. Shubin, S. H. Salaetdinov, K. Vlasova, G. Denisov, E. Novikov
Laser-driven microwave semiconductor switches demonstrate the ability to commutate power in sub-Terahertz frequency range. The effect of switching is based on photoconductivity induced in semiconductors by external laser emission. It is used to rapidly change and subsequent restore electro-dynamic properties of the switching resonator cavity. The most promising application is dynamic nuclear polarization spectroscopy requiring nanosecond level of switching performance and preserving the switched power from significant phase distortions. Up to now several working prototypes have been built and investigated for frequencies around 260 GHz. The highest switching power level is expected to be about 20W. The switches work seamlessly with pulsed 8-nanosecond 100-nanoJoule green 0.53 μm laser. They also work with 1.06 μm infrared laser demonstrating microsecond switching performance.
{"title":"260 GHz laser-driven semiconductor switches with performance rate up to nanosecond","authors":"M. Kulygin, S. Shubin, S. H. Salaetdinov, K. Vlasova, G. Denisov, E. Novikov","doi":"10.1109/COMCAS.2015.7360359","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360359","url":null,"abstract":"Laser-driven microwave semiconductor switches demonstrate the ability to commutate power in sub-Terahertz frequency range. The effect of switching is based on photoconductivity induced in semiconductors by external laser emission. It is used to rapidly change and subsequent restore electro-dynamic properties of the switching resonator cavity. The most promising application is dynamic nuclear polarization spectroscopy requiring nanosecond level of switching performance and preserving the switched power from significant phase distortions. Up to now several working prototypes have been built and investigated for frequencies around 260 GHz. The highest switching power level is expected to be about 20W. The switches work seamlessly with pulsed 8-nanosecond 100-nanoJoule green 0.53 μm laser. They also work with 1.06 μm infrared laser demonstrating microsecond switching performance.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"2674 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131719792","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360380
A. Zhuravlev, V. Razevig, S. Ivashov, A. Bugaev, M. Chizh
The performance of multi-static and mono-static radar systems is compared using experimental setup consisting of linear drives that move transmit and receive antennas in the programmable positions corresponding to multi-static or mono-static linear antenna arrays. The synthetic aperture in the direction perpendicular to the imitated linear arrays is formed by moving the target by an additional linear drive. Simulated and experimental radar images are obtained for various multi-static antenna configurations, and compared to their mono-static equivalents. The mono-static and multi-static signal processing technique is given. Possible applications of the described experimental technique are suggested.
{"title":"Experimental comparison of multi-static and mono-static antenna arrays for subsurface radar imaging","authors":"A. Zhuravlev, V. Razevig, S. Ivashov, A. Bugaev, M. Chizh","doi":"10.1109/COMCAS.2015.7360380","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360380","url":null,"abstract":"The performance of multi-static and mono-static radar systems is compared using experimental setup consisting of linear drives that move transmit and receive antennas in the programmable positions corresponding to multi-static or mono-static linear antenna arrays. The synthetic aperture in the direction perpendicular to the imitated linear arrays is formed by moving the target by an additional linear drive. Simulated and experimental radar images are obtained for various multi-static antenna configurations, and compared to their mono-static equivalents. The mono-static and multi-static signal processing technique is given. Possible applications of the described experimental technique are suggested.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115327336","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 : 2015-12-21DOI: 10.1109/COMCAS.2015.7360358
L. Peled-Eitan, I. Rusnak
This work deals with estimation of parabolic chirp signal with unknown parameters such as frequency, frequency change rate, frequency acceleration, amplitude and phase. The current estimation approaches of harmonic signals and chirps with unknown parameters are mainly based on parameter estimation. In this work the parabolic-chirp signal is represented as a rotating vector in a plane. The I and Q components of the chirp signal are similar to two dimensional circle motion in a plane with varying rotating rate. The main novelty of this approach is an estimation of a dynamic state of the signal like tracking of a spiraling motion. This estimation is based on a state dependent differential Riccati equation (SDDRE) estimation algorithm. The equivalence between parabolic chirp signal and spiraling motion is elaborated. Simulations of the vitality of this approach are presented.
{"title":"New approach to estimation of parabolic chirp signal with unknown parameters","authors":"L. Peled-Eitan, I. Rusnak","doi":"10.1109/COMCAS.2015.7360358","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360358","url":null,"abstract":"This work deals with estimation of parabolic chirp signal with unknown parameters such as frequency, frequency change rate, frequency acceleration, amplitude and phase. The current estimation approaches of harmonic signals and chirps with unknown parameters are mainly based on parameter estimation. In this work the parabolic-chirp signal is represented as a rotating vector in a plane. The I and Q components of the chirp signal are similar to two dimensional circle motion in a plane with varying rotating rate. The main novelty of this approach is an estimation of a dynamic state of the signal like tracking of a spiraling motion. This estimation is based on a state dependent differential Riccati equation (SDDRE) estimation algorithm. The equivalence between parabolic chirp signal and spiraling motion is elaborated. Simulations of the vitality of this approach are presented.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128851102","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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