Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)最新文献_第7页

Bin-hopping wavelet packet division multiple access (BH-WPDMA) 跳频小波分组多址(BH-WPDMA)

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838936

S. El-Khamy, E. Sabry, S.H. Nour El-Din

引用次数: 1

Suppression of Buneman instability by means of HF electric field in a warm plasma waveguide 热等离子体波导中高频电场抑制布曼不稳定性

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838974

N. G. Zaki, K. El-Shorbagy

引用次数: 0

Using radial-basis function neural networks to shape the array factor and reduce the side-lobe levels of phased antenna arrays 利用径向基函数神经网络对相控阵进行阵列因子塑造，降低相控阵的旁瓣电平

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838904

S. El-Khamy, A. El-Marakby

{"title":"Using radial-basis function neural networks to shape the array factor and reduce the side-lobe levels of phased antenna arrays","authors":"S. El-Khamy, A. El-Marakby","doi":"10.1109/NRSC.2000.838904","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838904","url":null,"abstract":"Shaping the array factor of an adaptive antenna array to obtain interference suppression is a difficult task due to the computational complexity, slow convergence rates and the high cost requirements. Although some antenna synthesis techniques can be used to reduce the side-lobe levels (and hence reduce the effect of interference arriving outside the main lobe), the resulting array factors suffer from the increased width of the main lobe. This degradation is more profound in phased arrays operating at large scanning angles and hence, the performance will be limited in many applications requiring radiation patterns with narrow steerable main lobes. In this paper, a technique based on radial-basis function neural networks (RBFNN) is presented for shaping the array factor of phased linear arrays to have relatively low side-lobe levels without affecting the beamwidth requirements of the main lobe. Both uniform and nonuniform linear arrays with initially low sidelobe levels, such as Tschebyscheff arrays are considered. The simulation results show that the use of RBFNN minimizes the sidelobe levels while keeping a predetermined width of main lobes. Thus, highly improved patterns with very deep sidelobe and increased directivity, with beam steering capabilities, are obtained.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123137181","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

Performance of FHMA, MFSK over Rician fading channel under MTJ MTJ条件下FHMA、MFSK在梯度衰落信道上的性能

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838969

A. El-Kassas, H. El-Hennawi, R. El-Zanfally, S. Mahrous

引用次数: 0

Simplifying and size reduction of Kaiser-Koch multiband fractal arrays using windowing and quantization techniques 利用开窗和量化技术简化和减小Kaiser-Koch多波段分形阵列

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838901

S. El-Khamy, M. Aboul-Dahab

引用次数: 5

Mobile channel model estimators and their performance evaluation using computer simulation 移动信道模型估计器及其计算机仿真性能评价

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838929

A. Abdel-Hamid, M. Aboul-Dahab, W.M. Rabie

引用次数: 1

Two partially adaptive antenna array techniques for interference elimination 两种部分自适应天线阵列干扰消除技术

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838905

M.A. Aboul Dahab, Mohamed M. M. Omar

{"title":"Two partially adaptive antenna array techniques for interference elimination","authors":"M.A. Aboul Dahab, Mohamed M. M. Omar","doi":"10.1109/NRSC.2000.838905","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838905","url":null,"abstract":"Fully or partially adaptive antenna array (AAA) techniques are designed to reduce the effect of interference and jamming signals. This is done by automatically steering nulls in the array field pattern directed towards the direction of arrival of the interfering signal. We present two simple and easy-to-implement partially AAA techniques to eliminate the effect of interfering signal when its direction of arrival is known. The first technique is based upon controlling the amplitudes of the signals at the end-elements of the array. This is done via a proposed algorithm that adjusts the weights of these elements to take one of three preset values. The technique is suitable to steer a null only within the range of the first sidelobe of the array. The second technique utilizes an auxiliary parallel array composed of 2N elements and is capable of steering a deep null at the direction of any sidelobe. This is done by controlling the weight coefficients of all elements of the auxiliary array. A performance criterion is proposed which is based upon equal weight coefficients for all auxiliary elements. In this way, the array has one degree of freedom, i.e. capable of steering only one null in the direction of arrival of interference. Satisfactory results are obtained via computer simulation results of the two techniques.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":"1079 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133019075","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

Antenna synthetic beam imaging using chirp algorithm 基于啁啾算法的天线合成波束成像

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838849

A. Allam, A. Amein, F. Elghany

引用次数: 0

A new proposed method for the design of broadband microwave planar diode detectors 提出了一种设计宽带微波平面二极管探测器的新方法

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838968

H.I.M. Al Anwar, H. El Hennawy, E. Hashish, M. El Said Mostafa

引用次数: 0

FDTD analysis of patch antenna over a multi-layer substrate 多层基板上贴片天线的时域有限差分分析

Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396) Pub Date : 2000-02-22 DOI: 10.1109/NRSC.2000.838838

A. Mahmoud, M.M. Abd Elrazzak, H. Elmikati

引用次数: 3