Guangguang Yang, D. Ndzi, K. Paulson, M. Filip, Abdul-Hadi Al-Hassani
— The ability to predict rain characteristics at small space-time scales is important, particularly in the planning, design and deployment of wireless networks operating at frequencies above 10 GHz. For wide area networks, high space and time resolution rainfall data is often not available and the cost of such measurements are prohibitive. This paper thus presents a new approach to address this problem using rain radar measurements to obtain rain estimates at finer resolutions than is available from the original measured data. This paper proposes three innovative methodologies: 1) the approach is not directly applied to measured rainfall rate data but focuses on the parameters of fitted lognormal distribution parameters and/or computed rain characteristics for each location; 2) to facilitate the application in wireless communication networks operating above 10 GHz, a set of databases and contour maps of rain parameters spanning North West Europe have been created. These conveniently and efficiently provide rain parameters for any location within the area under study; and 3) the proposed 3𝐷 space-time interpolation approach can extrapolate rain parameters at space-time resolutions that are shorter than those found in NIMROD radar databases.The results show that the approach presented in this paper can be used to provide { 1 𝑘𝑚, 5 𝑚𝑖𝑛𝑠 } space-time rain rate resolution from { 5 𝑘𝑚, 15 𝑚𝑖𝑛𝑠 } data for the whole of North West Europe with error percentages of less than 4%. This is far superior to estimates provided by the International Telecommunication Union recommended model.
{"title":"RAINFALL RATE FIELD SPACE-TIME INTERPOLATION TECHNIQUE FOR NORTH WEST EUROPE","authors":"Guangguang Yang, D. Ndzi, K. Paulson, M. Filip, Abdul-Hadi Al-Hassani","doi":"10.2528/PIERM19051608","DOIUrl":"https://doi.org/10.2528/PIERM19051608","url":null,"abstract":"— The ability to predict rain characteristics at small space-time scales is important, particularly in the planning, design and deployment of wireless networks operating at frequencies above 10 GHz. For wide area networks, high space and time resolution rainfall data is often not available and the cost of such measurements are prohibitive. This paper thus presents a new approach to address this problem using rain radar measurements to obtain rain estimates at finer resolutions than is available from the original measured data. This paper proposes three innovative methodologies: 1) the approach is not directly applied to measured rainfall rate data but focuses on the parameters of fitted lognormal distribution parameters and/or computed rain characteristics for each location; 2) to facilitate the application in wireless communication networks operating above 10 GHz, a set of databases and contour maps of rain parameters spanning North West Europe have been created. These conveniently and efficiently provide rain parameters for any location within the area under study; and 3) the proposed 3𝐷 space-time interpolation approach can extrapolate rain parameters at space-time resolutions that are shorter than those found in NIMROD radar databases.The results show that the approach presented in this paper can be used to provide { 1 𝑘𝑚, 5 𝑚𝑖𝑛𝑠 } space-time rain rate resolution from { 5 𝑘𝑚, 15 𝑚𝑖𝑛𝑠 } data for the whole of North West Europe with error percentages of less than 4%. This is far superior to estimates provided by the International Telecommunication Union recommended model.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2019-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43108287","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}
The possibility of continuous tuning of the spectral properties of two types of planar metamaterials based on the moire effect by changing their geometric parameters is demonstrated both experimentally and numerically. It is shown that for a one-dimensional moire metamaterial obtained by superposition of two microstrip photonic crystals with close periods, the position of the stop band in the spectrum can be controlled by changing these periods. For the two-dimensional moire metamaterial formed by two identical periodic crossed structures with hexagonal symmetry, the ability to control the frequency of the surface state mode by changing the crossing angle of these structures relative to each other has been experimentally and numerically shown. It is numerically demonstrated that if the moire metamaterial is irradiated by the horn antenna, a surface wave propagating in the metamaterial plane appears in all directions beginning from its intersection point with the axis of the incident wave beam. From the application point of view, moire metamaterials of this type can be considered as promising prototype of microwave filters, whose spectral properties can be continuously and smoothly mechanically rearranged.
{"title":"CONTROLLING SURFACE STATES OF PLANAR METAMATERIAL BASED ON MOIRE EFFECT","authors":"S. Polevoy, S. Tarapov","doi":"10.2528/pierm19060708","DOIUrl":"https://doi.org/10.2528/pierm19060708","url":null,"abstract":"The possibility of continuous tuning of the spectral properties of two types of planar metamaterials based on the moire effect by changing their geometric parameters is demonstrated both experimentally and numerically. It is shown that for a one-dimensional moire metamaterial obtained by superposition of two microstrip photonic crystals with close periods, the position of the stop band in the spectrum can be controlled by changing these periods. For the two-dimensional moire metamaterial formed by two identical periodic crossed structures with hexagonal symmetry, the ability to control the frequency of the surface state mode by changing the crossing angle of these structures relative to each other has been experimentally and numerically shown. It is numerically demonstrated that if the moire metamaterial is irradiated by the horn antenna, a surface wave propagating in the metamaterial plane appears in all directions beginning from its intersection point with the axis of the incident wave beam. From the application point of view, moire metamaterials of this type can be considered as promising prototype of microwave filters, whose spectral properties can be continuously and smoothly mechanically rearranged.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2019-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/pierm19060708","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48769195","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}
The standard expression for the magnetic interaction energy used in the study of the Aharonov-Bohm effect is investigated. We calculate the magnetic interaction energy between a point charge and an ...
{"title":"The Magnetic Interaction Energy between an Infinite Solenoid and a Passing Point Charge","authors":"H. Essén, J. Stén","doi":"10.2528/PIERM18052908","DOIUrl":"https://doi.org/10.2528/PIERM18052908","url":null,"abstract":"The standard expression for the magnetic interaction energy used in the study of the Aharonov-Bohm effect is investigated. We calculate the magnetic interaction energy between a point charge and an ...","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"71 1","pages":"145-156"},"PeriodicalIF":1.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18052908","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43490276","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}
A frequency-domain-based electromagnetic model of the lightning protection system of buildings is presented in this paper. Numerical model can accurately take into account all conductors of the lightning protection system, i.e., air-termination system, down-conductor system and earthtermination system. Using the presented electromagnetic model, attenuation effects of a grid-like spatial shield — sometimes used in lightning protection of buildings — will be analyzed for both the electric field and the magnetic field caused by a lightning strike. Three-dimensional distributions of the fields inside the shield are provided in the paper.
{"title":"Analysis of Attenuation Effect of Grid-Like Spatial Shields Used in Lightning Protection of Buildings","authors":"Dino Lovrić, S. Vujević","doi":"10.2528/PIERM18022006","DOIUrl":"https://doi.org/10.2528/PIERM18022006","url":null,"abstract":"A frequency-domain-based electromagnetic model of the lightning protection system of buildings is presented in this paper. Numerical model can accurately take into account all conductors of the lightning protection system, i.e., air-termination system, down-conductor system and earthtermination system. Using the presented electromagnetic model, attenuation effects of a grid-like spatial shield — sometimes used in lightning protection of buildings — will be analyzed for both the electric field and the magnetic field caused by a lightning strike. Three-dimensional distributions of the fields inside the shield are provided in the paper.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"69 1","pages":"137-149"},"PeriodicalIF":1.0,"publicationDate":"2018-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18022006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45918421","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}
This paper presents a compact and novel coupling structure for diplexers and power dividers based exclusively on coupled resonators. It consists of two cross-coupled structures joined together by two common resonators with a cluster of only four resonators. For a diplexer, it represents one of the most compact topologies that produces two 2nd-order channel filters with two fully controllable transmission zeros. This can be used to increase the rejection and isolations between channels without increasing the number of resonators. The same topology can also be used to realise a 3rd-order filtering power divider (FPD), with its embedded cascade trisection (CT) structure generating an asymmetric transmission zero. The coupling matrices of several diplexers and power dividers have been synthesized. Two microstrip diplexers with different positions of the transmission zeros have been demonstrated to verify the device concept. A 1.8 GHz FPD with a fractional bandwidth of 5% has also been prototyped, showing an improved out-of-band rejection from 15 dB to 25 dB below 1.71 GHz. The isolation performance of the divider has been investigated and improved from 7 dB to 18 dB across the band by adding only one resistor.
{"title":"A COMPACT COUPLING STRUCTURE FOR DIPLEXERS AND FILTERING POWER DIVIDERS","authors":"Yunying Wu, R. Wu, Yi Wang","doi":"10.2528/PIERM18041403","DOIUrl":"https://doi.org/10.2528/PIERM18041403","url":null,"abstract":"This paper presents a compact and novel coupling structure for diplexers and power dividers based exclusively on coupled resonators. It consists of two cross-coupled structures joined together by two common resonators with a cluster of only four resonators. For a diplexer, it represents one of the most compact topologies that produces two 2nd-order channel filters with two fully controllable transmission zeros. This can be used to increase the rejection and isolations between channels without increasing the number of resonators. The same topology can also be used to realise a 3rd-order filtering power divider (FPD), with its embedded cascade trisection (CT) structure generating an asymmetric transmission zero. The coupling matrices of several diplexers and power dividers have been synthesized. Two microstrip diplexers with different positions of the transmission zeros have been demonstrated to verify the device concept. A 1.8 GHz FPD with a fractional bandwidth of 5% has also been prototyped, showing an improved out-of-band rejection from 15 dB to 25 dB below 1.71 GHz. The isolation performance of the divider has been investigated and improved from 7 dB to 18 dB across the band by adding only one resistor.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"69 1","pages":"161-170"},"PeriodicalIF":1.0,"publicationDate":"2018-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18041403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44355045","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}
D. Henry, H. Aubert, E. Ricard, D. Hazard, M. Lihoreau
In animal production, behavioral selection is becoming increasingly important to improvethe docility of livestock. Several behavioral traits, including motion, are experimentally recorded in orderto characterize the reactivity of animals and investigate its genetic determinism. Behavioral analysesare often time consuming because large numbers of animals have to be compared. For this reason,automatization is needed to develop high throughput data recording and efficient phenotyping. Herewe introduce a new method to monitor the position and motion of an individual sheep using a 24 GHzfrequency-modulated continuous-wave radar in a classical experimental paradigm called thearena test.The measurement method is non-invasive, does not require equipping animals with electronic tags,and offers a depth measurement resolution less than 10 cm. Parasitic echoes (or “clutters”) that couldalter the sheep backscattered signal are removed by using the singular value decomposition analysis.In order to enhance the clutters mitigation, the direction-of-arrivals of electromagnetic backscatteredsignals are derived from applying the MUltiple Signals Classification algorithm. We discuss how theproposed automatized monitoring of individual sheep could be applied to a wider range of species andexperimental contexts for animal behavior research.
{"title":"Automated Monitoring of Livestock Behavior Using Frequency-Modulated Continuous-Wave Radars","authors":"D. Henry, H. Aubert, E. Ricard, D. Hazard, M. Lihoreau","doi":"10.2528/PIERM18040404","DOIUrl":"https://doi.org/10.2528/PIERM18040404","url":null,"abstract":"In animal production, behavioral selection is becoming increasingly important to improvethe docility of livestock. Several behavioral traits, including motion, are experimentally recorded in orderto characterize the reactivity of animals and investigate its genetic determinism. Behavioral analysesare often time consuming because large numbers of animals have to be compared. For this reason,automatization is needed to develop high throughput data recording and efficient phenotyping. Herewe introduce a new method to monitor the position and motion of an individual sheep using a 24 GHzfrequency-modulated continuous-wave radar in a classical experimental paradigm called thearena test.The measurement method is non-invasive, does not require equipping animals with electronic tags,and offers a depth measurement resolution less than 10 cm. Parasitic echoes (or “clutters”) that couldalter the sheep backscattered signal are removed by using the singular value decomposition analysis.In order to enhance the clutters mitigation, the direction-of-arrivals of electromagnetic backscatteredsignals are derived from applying the MUltiple Signals Classification algorithm. We discuss how theproposed automatized monitoring of individual sheep could be applied to a wider range of species andexperimental contexts for animal behavior research.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"69 1","pages":"151-160"},"PeriodicalIF":1.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18040404","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41970887","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}
H. Chattha, M. Hanif, Xiaodong Yang, Q. Abbasi, I. Rana
A compact printed multi-band frequency reconfigurable patch antenna for 4G LTE applications is presented in this paper (50 x 60 x 1.6 mm3). The antenna consists of W-shaped and Inverted-U shaped patch lines connected in a Tree-shape on the front side of the antenna. The back-side of the antenna contains a 90°-tilted T-shaped strip connected with an Inverted-L shaped strip which is shorted with a patch on the front side for increasing the electrical length to cover lower frequency bands. Frequency reconfigurability is achieved by inserting three switches i.e., PIN diodes. The most critical part of this work is the designing of RLC-based DC line circuits for providing the DC biasing to the PIN diodes used as switches and inserting them at optimum locations. This antenna is reconfigurable among eight different 4G LTE frequency bands including 0.9 GHz, 1.4 GHz, 1.5 GHz, 1.6 GHz, 1.7 GHz, 1.8 GHz, 2.6 GHz, 3.5 GHz and WLAN band 2.5 GHz. The antenna exhibits different radiation patterns having a different direction of peak gain at different frequencies and for different switching combinations. The antenna is simulated with CST, and a prototype is fabricated to compare the measured and simulated results with good accuracy.
本文提出了一种适用于4G LTE应用的紧凑型印刷多频带频率可重构贴片天线（50 x 60 x 1.6 mm3）。天线由W形和倒U形接线组成，接线以树形连接在天线的前侧。天线的背面包含一个90°倾斜的T形带，该T形带与一个倒L形带相连，该倒L形条与正面的贴片短路，以增加电气长度以覆盖较低的频带。通过插入三个开关（即PIN二极管）实现频率可重新配置。这项工作最关键的部分是设计基于RLC的直流线路电路，用于向用作开关的PIN二极管提供直流偏置，并将其插入最佳位置。该天线可在八个不同的4G LTE频带中重新配置，包括0.9 GHz、1.4 GHz、1.5 GHz、1.6 GHz、1.7 GHz、1.8 GHz、2.6 GHz、3.5 GHz和WLAN频带2.5 GHz。天线在不同的频率和不同的开关组合下表现出具有不同峰值增益方向的不同辐射方向图。利用CST对天线进行了仿真，并制作了样机，对测量结果和仿真结果进行了精度比较。
{"title":"Frequency Reconfigurable Patch Antenna for 4G LTE Applications","authors":"H. Chattha, M. Hanif, Xiaodong Yang, Q. Abbasi, I. Rana","doi":"10.2528/PIERM18022101","DOIUrl":"https://doi.org/10.2528/PIERM18022101","url":null,"abstract":"A compact printed multi-band frequency reconfigurable patch antenna for 4G LTE applications is presented in this paper (50 x 60 x 1.6 mm3). The antenna consists of W-shaped and Inverted-U shaped patch lines connected in a Tree-shape on the front side of the antenna. The back-side of the antenna contains a 90°-tilted T-shaped strip connected with an Inverted-L shaped strip which is shorted with a patch on the front side for increasing the electrical length to cover lower frequency bands. Frequency reconfigurability is achieved by inserting three switches i.e., PIN diodes. The most critical part of this work is the designing of RLC-based DC line circuits for providing the DC biasing to the PIN diodes used as switches and inserting them at optimum locations. This antenna is reconfigurable among eight different 4G LTE frequency bands including 0.9 GHz, 1.4 GHz, 1.5 GHz, 1.6 GHz, 1.7 GHz, 1.8 GHz, 2.6 GHz, 3.5 GHz and WLAN band 2.5 GHz. The antenna exhibits different radiation patterns having a different direction of peak gain at different frequencies and for different switching combinations. The antenna is simulated with CST, and a prototype is fabricated to compare the measured and simulated results with good accuracy.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"69 1","pages":"1-13"},"PeriodicalIF":1.0,"publicationDate":"2018-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18022101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47932178","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}
A symplectic pseudospectral time-domain (SPSTD) scheme is developed to solve Schrodinger equation. Instead of spatial finite differences in conventional finite-difference time-domain (FDTD) method, the fast Fourier transform is used to calculate the spatial derivatives. In time domain, the scheme adopts high-order symplectic integrators to simulate time evolution of Schrodinger equation. A detailed numerical study on the eigenvalue problems of 1D quantum well and 3D harmonic oscillator is carried out. The simulation results strongly confirm the advantages of the SPSTD scheme over the traditional PSTD method and FDTD approach. Furthermore, by comparing to the traditional PSTD method and the non-symplectic Runge-Kutta (RK) method, the explicit SPSTD scheme which is an infinite order of accuracy in space domain and energy-conserving in time domain, is well suited for a long-term simulation.
{"title":"Symplectic Pseudospectral Time-Domain Scheme for Solving Time-Dependent Schrodinger Equation","authors":"Jing Shen, W. Sha, Xiaojing Kuang, Jinhua Hu, Zhixiang Huang, Xianliang Wu","doi":"10.2528/PIERM18010808","DOIUrl":"https://doi.org/10.2528/PIERM18010808","url":null,"abstract":"A symplectic pseudospectral time-domain (SPSTD) scheme is developed to solve Schrodinger equation. Instead of spatial finite differences in conventional finite-difference time-domain (FDTD) method, the fast Fourier transform is used to calculate the spatial derivatives. In time domain, the scheme adopts high-order symplectic integrators to simulate time evolution of Schrodinger equation. A detailed numerical study on the eigenvalue problems of 1D quantum well and 3D harmonic oscillator is carried out. The simulation results strongly confirm the advantages of the SPSTD scheme over the traditional PSTD method and FDTD approach. Furthermore, by comparing to the traditional PSTD method and the non-symplectic Runge-Kutta (RK) method, the explicit SPSTD scheme which is an infinite order of accuracy in space domain and energy-conserving in time domain, is well suited for a long-term simulation.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"66 1","pages":"109-118"},"PeriodicalIF":1.0,"publicationDate":"2018-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18010808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42319161","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}
Hyung-Ju Kim, K. Bae, Won-Young Song, Eunjung Yang, N. Myung
This paper proposes a two-dimensional (2-D) inverse synthetic aperture radar (ISAR) imaging method with nonuniformly obtained angle samples. A one-dimensional (1-D) radar image, a range profile, is obtained using frequency samples within a given bandwidth. 2-D ISAR images are then obtained by acquiring the Doppler spectrum using range profiles obtained from multiple observation angles having a constant interval. However, when ISAR images are obtained by applying the rangeDoppler imaging method for a target scattered signal with nonuniform angle samples, a clear image cannot be obtained. In this paper, we propose a method to generate a covariance matrix from a nonuniform angle sample and obtain an ISAR image based on the multiple signal characterization (MUSIC) technique. The proposed method can be applied to the target scattering signal using a search radar, which observes target with nonuniform aspect angles. We present a scattering signal model of a target for the search radar and provide ISAR images obtained by applying the proposed method to simulated and measured data, respectively. Results reveal that the proposed method improves image quality and reduces computation time compared to the conventional method.
{"title":"An ISAR Imaging Method for Search Radar Involving Nonuniform Angle Samples","authors":"Hyung-Ju Kim, K. Bae, Won-Young Song, Eunjung Yang, N. Myung","doi":"10.2528/pierm18011802","DOIUrl":"https://doi.org/10.2528/pierm18011802","url":null,"abstract":"This paper proposes a two-dimensional (2-D) inverse synthetic aperture radar (ISAR) imaging method with nonuniformly obtained angle samples. A one-dimensional (1-D) radar image, a range profile, is obtained using frequency samples within a given bandwidth. 2-D ISAR images are then obtained by acquiring the Doppler spectrum using range profiles obtained from multiple observation angles having a constant interval. However, when ISAR images are obtained by applying the rangeDoppler imaging method for a target scattered signal with nonuniform angle samples, a clear image cannot be obtained. In this paper, we propose a method to generate a covariance matrix from a nonuniform angle sample and obtain an ISAR image based on the multiple signal characterization (MUSIC) technique. The proposed method can be applied to the target scattering signal using a search radar, which observes target with nonuniform aspect angles. We present a scattering signal model of a target for the search radar and provide ISAR images obtained by applying the proposed method to simulated and measured data, respectively. Results reveal that the proposed method improves image quality and reduces computation time compared to the conventional method.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"65 1","pages":"9-17"},"PeriodicalIF":1.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/pierm18011802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48226127","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}
This paper deals with the calculation of electric field in a copper piece of cubic shape which is submitted to a sinusoidal magnetic field. This 3D problem is set into equation and solved by means of two different approaches. A stochastic method for 3-D electric field computations is presented and compared to a finite element method. The main goal of this paper is to compare these two methods on a classical problem putting forward the advantages of the chosen method. First of all, we present the problem modelling. Then, the Monte-Carlo method used to solve 3D time dependent problem is described and is compared to the finite element method, in the last part.
{"title":"3D Computation of Electric Field by a Stochastic Method","authors":"J. Lévêque, M. Hinaje, K. Berger, M. Panfilov","doi":"10.2528/PIERM18010815","DOIUrl":"https://doi.org/10.2528/PIERM18010815","url":null,"abstract":"This paper deals with the calculation of electric field in a copper piece of cubic shape which is submitted to a sinusoidal magnetic field. This 3D problem is set into equation and solved by means of two different approaches. A stochastic method for 3-D electric field computations is presented and compared to a finite element method. The main goal of this paper is to compare these two methods on a classical problem putting forward the advantages of the chosen method. First of all, we present the problem modelling. Then, the Monte-Carlo method used to solve 3D time dependent problem is described and is compared to the finite element method, in the last part.","PeriodicalId":39028,"journal":{"name":"Progress in Electromagnetics Research M","volume":"67 1","pages":"119-128"},"PeriodicalIF":1.0,"publicationDate":"2018-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2528/PIERM18010815","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43346557","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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