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IEEE Antennas and Propagation Society International Symposium 1992 Digest最新文献

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Bayesian probability theory applied to the problem of radar target discrimination 贝叶斯概率论在雷达目标识别问题中的应用
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221662
L. Riggs, C.R. Smith
{"title":"Bayesian probability theory applied to the problem of radar target discrimination","authors":"L. Riggs, C.R. Smith","doi":"10.1109/APS.1992.221662","DOIUrl":"https://doi.org/10.1109/APS.1992.221662","url":null,"abstract":"The task of discriminating among a set of N known targets based on their radar returns is viewed as a problem of information processing, calling for a full application of probability theory. Two distinct problem areas are investigated. First, Bayesian probability theory is used to derive an expression for an enhanced discrimination waveform which, in the two-target case, maximizes the log odds in favor of one target over the other. Numerical results are provided which show that best discrimination, in the simple two-target case, occurs when the incident waveform has its energy concentrated near the frequency where the difference in the impulse response of the two targets reaches a maximum. Second, probability theory is used to discriminate among a set of targets based on their high-range-resolution radar returns. Example calculations show that for the four-target case the Bayesian algorithm identifies the unknown target correctly greater than 90% of the time for signal-to-noise ratios as low as 2 (3 dB).<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124747489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Analysis of the impulse radiating antenna 脉冲辐射天线的分析
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221667
E. Farr
{"title":"Analysis of the impulse radiating antenna","authors":"E. Farr","doi":"10.1109/APS.1992.221667","DOIUrl":"https://doi.org/10.1109/APS.1992.221667","url":null,"abstract":"A procedure is developed for analyzing the radiation on the impulse radiating antenna. High- and low-frequency asymptotes for the radiation on axis are developed, and comparison to a wire-grid model run under the Nuclear Electromagnetics Code is favorable. These preliminary results indicate no late-timing ringing of the radiated waveform.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125034642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Modulated scattering techniques calibration procedure for a 2D array 二维阵列调制散射技术标定程序
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221742
P. Garreau, K. van't Klooster, J. Bolomey, D. Picard
{"title":"Modulated scattering techniques calibration procedure for a 2D array","authors":"P. Garreau, K. van't Klooster, J. Bolomey, D. Picard","doi":"10.1109/APS.1992.221742","DOIUrl":"https://doi.org/10.1109/APS.1992.221742","url":null,"abstract":"The authors present a calibration technique for improving the accuracy of the near-field measurement with a 2D modulated scattering array. It is explained how the nonuniform characteristics in amplitude and in phase of a 2D array can be corrected by using a separate assessment of the array with a plane wave illumination. The calibration file is obtained by measuring a reference electric field provided by the ESTEC compact antenna test range. A comparison of a near-field measurement of a pyramidal horn is shown before and after such calibration.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129464492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Efficient signature estimations in an advanced graphics environment 高效的签名估计在一个先进的图形环境
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221757
R. Shepherd, T. D. Olson, C. Liang
{"title":"Efficient signature estimations in an advanced graphics environment","authors":"R. Shepherd, T. D. Olson, C. Liang","doi":"10.1109/APS.1992.221757","DOIUrl":"https://doi.org/10.1109/APS.1992.221757","url":null,"abstract":"Summary form only given. An advanced technique has been developed for the computation of physical optics backscattering from large, complex targets over multiple frequency bands with unprecedented speed. It takes full advantage of the power of the present (and future) high-performance graphics engines for surface rendering and shadowing. This method has been implemented with a first-generation code labeled VISAGE (Visual Investigation of Scattering in an Advanced Graphics Environment) on the Silicon Graphics Iris 4D series workstations. The computation throughput has been shown to be essentially independent of the target complexity and the desired number of frequencies. In addition, geometrical shadowing of target components is automatically handled.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129757969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
The application of a circuit simulator to the design and analysis of passive and active microstrip antennas 电路模拟器在无源和有源微带天线设计与分析中的应用
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221622
D. Roscoe, A. Ittipiboon, L. Shafai
{"title":"The application of a circuit simulator to the design and analysis of passive and active microstrip antennas","authors":"D. Roscoe, A. Ittipiboon, L. Shafai","doi":"10.1109/APS.1992.221622","DOIUrl":"https://doi.org/10.1109/APS.1992.221622","url":null,"abstract":"A procedure for the analysis and design of passive traveling wave antennas using a commercially available circuit simulator is presented. An example is presented showing its usefulness in providing insight into printed antenna operation. The procedure of analyzing traveling wave antennas using EMSim and calculating the resultant far-field radiation pattern has been applied to a circularly polarized rampart and four-arm traveling-wave antenna. Results look promising and a further extension to the analysis of integrated antennas is under way.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128376254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
FEM modelling of electromagnetic scattering from 2-D RAM-coated objects 二维ram涂层物体电磁散射的有限元模拟
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221886
A. McCowen, J.A.R. Macnab, M. Towers
{"title":"FEM modelling of electromagnetic scattering from 2-D RAM-coated objects","authors":"A. McCowen, J.A.R. Macnab, M. Towers","doi":"10.1109/APS.1992.221886","DOIUrl":"https://doi.org/10.1109/APS.1992.221886","url":null,"abstract":"The FEM (finite element method) technique using infinite elements to model the open boundary is applied to RAM (radar absorbing material)-coated 2-D circular cylinders. The far fields computed from both the infinite elements and the current distribution on the scatterer are shown to give good agreement with analytic solutions. The advantages of solving for the local near fields is also demonstrated.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128528040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of meanderline polarizer based on modal technique 基于模态技术的曲线偏振器设计
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221841
K.K. Chan, S.R. Gauthier
{"title":"Design of meanderline polarizer based on modal technique","authors":"K.K. Chan, S.R. Gauthier","doi":"10.1109/APS.1992.221841","DOIUrl":"https://doi.org/10.1109/APS.1992.221841","url":null,"abstract":"In the modal technique for the analysis of multilayered structures, a generalized S-matrix description of each infinite, periodic, metallic screen is obtained by the Floquet mode expansion moment method. These S-matrices are then cascaded together with those of the intervening dielectric layers to form an overall S-matrix. At the input plane of the polarizer, the electric field vector of a linearly polarized incident plane of the polarizer, the electric field vector of a linearly polarized incident plane wave is inclined at 45 degrees to the meanderline line axis so that either a TE (transverse electric) or a TM (transverse magnetic) mode is present. The polarizer then provides the necessary coupling between or conversion into the TE and TM modes so that, at the output plane, a circularly polarized wave exists, consisting of a TE00 and TM00 mode, all other modes being evanescent. The S-matrix of the layered structure describes this mode conversion. By attaching an optimizer to the analysis module, a synthesis program is obtained. The dimensions of the meanderline within the cell, the cell periodicities, and the thickness of the supporting layers are manipulated to provide low axial ratio and good match over a range of frequencies and incident angles.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129375080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Body effect on characteristics of small loop antenna in pager systems 传呼系统中小环形天线特性的体效应
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221583
K. Ito, I. Ida, Menghan Wu
{"title":"Body effect on characteristics of small loop antenna in pager systems","authors":"K. Ito, I. Ida, Menghan Wu","doi":"10.1109/APS.1992.221583","DOIUrl":"https://doi.org/10.1109/APS.1992.221583","url":null,"abstract":"A small rectangular loop antenna has been studied and widely used as a mobile communication antenna especially in pager systems. Since it is usually installed in a pager and used very close to a human body, its effect against the human body has to be taken into consideration. For simplicity, the surface of the human body may be replaced by a conducting reflector. The authors experimentally and theoretically examine the influence of a reflector on the input impedance of a small loop antenna. Calculated results are obtained by using the method of moments and compared with experimental data. The validity of the method of moments is confirmed. Then, using the method, a positive effect of the human body on the actual gain of the antenna is found analytically. Simulations carried out using practical models seen in the pager show interesting characteristics of the capacitor-loaded small loop antennas.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"1606 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127449385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
On a class of complete and incomplete generalized Airy functions and their application to high-frequency scattering and diffraction problems 一类完全和不完全广义Airy函数及其在高频散射和衍射问题中的应用
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221909
E. Constantinides, R. Marhefka
{"title":"On a class of complete and incomplete generalized Airy functions and their application to high-frequency scattering and diffraction problems","authors":"E. Constantinides, R. Marhefka","doi":"10.1109/APS.1992.221909","DOIUrl":"https://doi.org/10.1109/APS.1992.221909","url":null,"abstract":"The generalized Airy functions and their derivations serve as canonical functions for the uniform asymptotic evaluation of a class of integrals characterized by multiple saddle points that are arbitrarily close to one another or to an integration endpoint. The complete asymptotic representations for this class of functions are rigorously derived, and some scattering and diffraction problems in which they apply are discussed.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127046430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Scaling and asymptotic compensation techniques for early-time response calculation by transform methods 变换法计算早期响应的标度和渐近补偿技术
IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI: 10.1109/APS.1992.221854
T. Wong, M. Aly, K. Han
{"title":"Scaling and asymptotic compensation techniques for early-time response calculation by transform methods","authors":"T. Wong, M. Aly, K. Han","doi":"10.1109/APS.1992.221854","DOIUrl":"https://doi.org/10.1109/APS.1992.221854","url":null,"abstract":"Various approaches to improving the computational efficiency in obtaining the early-time response, by inverse Laplace transform, in pulse propagation and transient scattering analysis are described. Depending on the asymptotic characteristics of the response function in the frequency domain, expanding the time scale and shifting the origin of time often result in accelerated convergence of the numerical Bromwich integral. The use of multiplicative functions such as sech (as) to control the asymptotic growth of the response function in the frequency domain enables the early-time return signals in scattering problems to be represented in terms of the superposition of exponential functions.<<ETX>>","PeriodicalId":289865,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1992 Digest","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127186446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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