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Solution of the three-dimensional corner reflector antenna problems using the method of moments 用矩量法求解三维角反射面天线问题
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551105
H. Elkamchouchi, M. Elrakaiby
{"title":"Solution of the three-dimensional corner reflector antenna problems using the method of moments","authors":"H. Elkamchouchi, M. Elrakaiby","doi":"10.1109/NRSC.1996.551105","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551105","url":null,"abstract":"A reflector antenna utilizing three planar reflectors and a 3/4/spl lambda/-unipole radiator has been used to increase the gain of the two-dimensional corner reflector antenna. The calculation of the antenna parameters were based on the image and electromotive force (EMF) methods. The method of moments is used for calculating the input impedance, gain and radiation patterns for two cases. In the first case continuous grounded conducting plane reflectors were used with the method of images. In the second case grided type plane reflectors consisting of parallel wires of suitable radii separation and length are used directly without the method of images. A good agreement between the results is indicated.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131697846","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: 2
Channel sharing policies for a mobile radio network providing wireless telephone and dispatch services 提供无线电话和调度服务的移动无线网络的信道共享策略
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551121
M. Nofal
{"title":"Channel sharing policies for a mobile radio network providing wireless telephone and dispatch services","authors":"M. Nofal","doi":"10.1109/NRSC.1996.551121","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551121","url":null,"abstract":"Channel sharing policies are proposed for a mobile radio network that provides telephone and dispatch services. The two services have different features and different service fields. The salient features and operational principles of both services are described. Based on these features, channel sharing policies are proposed. Analytical models are established for the policies in order to gauge the performance of the network. Results are provided and discussed for nominal network parameters.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"9 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125619391","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
A simple invariant neural network for 2-D image recognition 二维图像识别的简单不变神经网络
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551116
A. Abo-Zaid
{"title":"A simple invariant neural network for 2-D image recognition","authors":"A. Abo-Zaid","doi":"10.1109/NRSC.1996.551116","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551116","url":null,"abstract":"A simple invariant neural network has been proposed. The network has invariance against scale and, rotation changes, in addition to the inherent shift of starting point on the image contour. This invariance comes from the new use of the MT-transform as a feature vector in a pre-processing stage. Thus, a complete invariance has been achieved, without any complexity in the network. Testing of the network, shows about a 100% recognition rate.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116017712","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
Effect of shunt resistance and reverse saturation current on the performance of solar cells 并联电阻和反向饱和电流对太阳能电池性能的影响
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551143
Z. Kamiel, M. Tayel, M. Elbanna, A. Nasser
{"title":"Effect of shunt resistance and reverse saturation current on the performance of solar cells","authors":"Z. Kamiel, M. Tayel, M. Elbanna, A. Nasser","doi":"10.1109/NRSC.1996.551143","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551143","url":null,"abstract":"A study of the solar cell model concerning the effect of shunt resistance (R/sub sh/) and the reverse saturation current (I/sub O/) on the performance of solar cells is presented. It is found that an upper bound for the fill factor determines the maximum attainable efficiency. Also, there is a shunt value after which the model behaves independently of the value of the shunt resistance. The effect of the product of R/sub sh/ and I/sub O/ on the maximum efficiency was further studied. This resulted in detecting a region of improved performance for both R/sub sh/ and I/sub O/.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132637336","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
An approach to improve airborne radar performance in clutter environment 一种提高杂波环境下机载雷达性能的方法
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551147
A. M. Hamad, H. Abdel-Wahab, E.A.B. El-Sehely
{"title":"An approach to improve airborne radar performance in clutter environment","authors":"A. M. Hamad, H. Abdel-Wahab, E.A.B. El-Sehely","doi":"10.1109/NRSC.1996.551147","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551147","url":null,"abstract":"This paper introduces a technique for clutter reduction in airborne radar systems. This technique is based on the fact that the nature of the clutter and target are different in the sense that the clutter returns are randomly distributed from scan to scan, while those for target have a deterministic behavior. An algorithm is developed to discriminate between target and clutter returns from one scan frame to another, where 3 out of 5 criteria used to correlate successive scan frames were adopted. A series of simulation experiments are carried out where the algorithm is applied on range-scan frames. The results show a reduction in P/sub fa/ with an increase in P/sub D/ for different target scenarios.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133682964","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
Objective methods for radar systems evaluation 雷达系统评价的客观方法
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551427
F. Ibrahim, A. Hanafy
{"title":"Objective methods for radar systems evaluation","authors":"F. Ibrahim, A. Hanafy","doi":"10.1109/NRSC.1996.551427","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551427","url":null,"abstract":"In view of lack of a simple and generalized procedure to technically compare between a group of radars, a set of theoretical criteria have been adopted, and mathematical relations are derived for radar system evaluation. These radars may have different structures and technologies but they are utilized in the same application. In order to utilize the derived equations, the technical parameters of the radar modules (transmitter, receiver, antenna, signal processing, displays, ECCM techniques, and other radar system control functions) are required in advance. If some of the major radar parameters are not available default values are assigned for these parameters. These values are either known to the radar specialists or derived from other radar parameters based on mathematical expressions. Examples are given and the application of the calculated results to radar system analysis and design are discussed.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132855923","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
A modified charge-control model for HEMTs 改进的hemt电荷控制模型
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551144
M. Aziz, M. El-Banna
{"title":"A modified charge-control model for HEMTs","authors":"M. Aziz, M. El-Banna","doi":"10.1109/NRSC.1996.551144","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551144","url":null,"abstract":"A modified model for the charge control in HEMT devices is presented. The model is based on the solution of Poisson's equation in the AlGaAs layer using an accurate numerical method. The model assumes a non-uniform ionized donor concentration, this nonuniformity is assumed to follow the Fermi-Dirac statistics. The free carrier concentration in AlGaAs is deduced from the drift/diffusion equation assuming zero current density at the heterointerface. The obtained results have been compared with other models. The effects of structural and processing parameters on the charge control mechanism are extensively examined and optimization of these parameters for design of high performance devices are also discussed.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122250035","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
A channel assignment scheme for micro-cellular communication systems 一种微蜂窝通信系统的信道分配方案
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551138
M. Ashour, F. W. Zaki, R. El-Zanfally, R. El-Awadi
{"title":"A channel assignment scheme for micro-cellular communication systems","authors":"M. Ashour, F. W. Zaki, R. El-Zanfally, R. El-Awadi","doi":"10.1109/NRSC.1996.551138","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551138","url":null,"abstract":"A modified hybrid channel assignment scheme (MHCA) for micro-cellular mobile radio system is introduced. This algorithm is based on the conventional hybrid channel allocation scheme with reassignment and looking forward strategies. The reassignment strategy is activated when a call is terminated on a fixed channel to switch a call in progress in a dynamic channel. Also, another switching scheme between dynamic channels is proposed to enhance the performance. The forward-looking strategy is used in order to obtain a better performance at high traffic loads. Computer simulation experiments on a 49 hexagonal cellular system show the superiority of the modified hybrid scheme as compared to other hybrid channel assignment schemes reported elsewhere.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"17 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129283342","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
Full wave analysis of HTS superconducting microstrip transmission lines using spectral-domain immittance approach 用谱域阻抗法分析高温超导微带传输线的全波
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551106
A.I. Amora, H. Ghali
{"title":"Full wave analysis of HTS superconducting microstrip transmission lines using spectral-domain immittance approach","authors":"A.I. Amora, H. Ghali","doi":"10.1109/NRSC.1996.551106","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551106","url":null,"abstract":"This paper presents a modified spectral domain immittance approach method used for full-wave analysis of high-temperature superconducting microstrip transmission lines. A strip transformation technique is used to transform the thin superconducting film into infinitely thin strip of infinite conductivity. In this technique the superconducting strip is treated as an impedance sheet which introduces new boundary conditions at the surface of the strip. Enforcing these new boundary conditions in the Fourier domain introduces some modification to the diagonal elements of the Green's impedance matrix, in the spectral domain, of the microstrip structure. An efficient computer program was developed to search for the complex roots of eigenvalue equation using Muller's method. The effective dielectric constant for several HTS microstrip transmission lines were computed using our program. The comparison between these results and published data indicated the validity of our program in estimating the dispersion characteristics of superconducting microstrip lines having high film-to-substrate thickness ratio.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121280368","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: 2
Improving the performance of compact signature analysis using LFSR 利用LFSR改进紧凑签名分析的性能
Thirteenth National Radio Science Conference. NRSC '96 Pub Date : 1996-03-19 DOI: 10.1109/NRSC.1996.551114
R. Seireg, M. Ghoniemy, S. Bahgat, A. Seddik
{"title":"Improving the performance of compact signature analysis using LFSR","authors":"R. Seireg, M. Ghoniemy, S. Bahgat, A. Seddik","doi":"10.1109/NRSC.1996.551114","DOIUrl":"https://doi.org/10.1109/NRSC.1996.551114","url":null,"abstract":"The compact signature analysis (CSA) has been proposed to reduce the compaction technique hardware by 50%. The general formula for the corresponding aliasing error probability (AEP) has been found to lie between 0 and 1. The condition for the AEP of the compact signature to be equal to or less than 1/2/sup k/ was hard to calculate. An additional hardware condition is added to validate the mentioned value. Several examples, with different units under test (UUT) are studied.","PeriodicalId":127585,"journal":{"name":"Thirteenth National Radio Science Conference. NRSC '96","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131162565","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
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