Array Algorithm
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. Synthesis of Sparse Arrays Based On CIGA (Convex Improved Genetic Algorithm)
Abstract In this paper, a novel hybrid algorithm on beam pattern synthesis of sparse arrays is proposed, which aims at minimizing the peak sidelobe level (PSLL). Sparse arrays can provide higher spatial resolution and relatively lower sidelobe than general arrays, but it is necessary to solve the multi-constraint problem of nonconvex nonlinear. Thus, we prop
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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2. Uma Nova Proposta para a Obtenção da Complexidade de Pior Caso do ShellSort
RESUMO A complexidade de pior caso do ShellSort, um algoritmo de ordenação por comparação, depende de uma sequência de passos dada de entrada. Cada passo consiste de um inteiro representando a diferença de índices dos pares de elementos que devem ser comparados durante a ordenação de um vetor de entrada. Tal complexidade é conhecida somente para al
TEMA (São Carlos). Publicado em: 13/12/2019
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3. Optimization of Planar Antenna Arrays Using the Firefly Algorithm
Abstract This paper describes the application of the Firefly Algorithm for the optimization of linear and planar antenna arrays. In order to demonstrate the potential of this technique, three applications are reported. The first one is the synthesis of a radiation pattern with isoflux distribution with a non-uniformly spaced linear array composed of isotropi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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4. Mejora en la calidad de imágenes ultrasónicas aplicando métodos de composición espacial y empleando sistemas de Phased Array
ABSTRACT The Phased Array Ultrasonic Technique (PAUT) has become a widely used imaging tool for the Nondestructive Testing in the industrial field. The PAUT allows making deflections and focusing the ultrasound beam at different depths within the material, through an electronic control of each one of the N elements that make up the array transducer. Thus, se
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Multi-Objective Curing Cycle Optimization for Glass Fabric/Epoxy Composites Using Poisson Regression and Genetic Algorithm
In this study, a multi-parameter design of experiments, using Taguchi method, has been conducted in order to investigate the optimum curing conditions for glass fabric/epoxy laminated composites, followed by a statistical analysis and genetic algorithm optimization. Heating rate a, temperature T1 and duration h1 were treated as independent variables in a L25
Mat. Res.. Publicado em: 01/02/2018
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6. Parallel Implementations of RCM Algorithm for Bandwidth Reduction of Sparse Matrices
RESUMO O algoritmo Reverse Cuthil-McKee (RCM) constitui uma heurística bem conhecida para o reordenamento de matrizes esparsas. Ele é tipicamente aplicado para a melhoria do desempenho da computação de sistemas lineares de equações. Este artigo descreve duas abordagens paralelas propostas para o algoritmo Reverse Cuthill-McKee, assim como versões otim
TEMA (São Carlos). Publicado em: 2017-12
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7. Quantum Particle Swarm Optimization for Synthesis of Non-uniformly Spaced Linear Arrays with Broadband Frequency Invariant Pattern
Abstract This paper describes a method using Quantum Particle Swarm Optimization to obtain a broadband frequency invariant pattern for synthesis of nonuniformly spaced linear array of isotropic antennas. Two cases related to this work using QPSO have been studied, namely, in the first case, the generated frequency invariant far-field pattern is broadside in
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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8. Time Reversal Imaging Based on the Space-Frequency ESPRIT
Abstract A novel time reversal approach for the point target imaging is proposed in this paper. This method requires only single measurement by the time reversal array, and it exploits the space-frequency decomposition plus the rotation invariance of the signal subspace for the target detecting. Numerical simulations are carried out to validate the imaging p
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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9. Analysis of Linear Antenna Array for minimum Side Lobe Level, Half Power Beamwidth, and Nulls control using PSO
Abstract This paper presents the optimization performance of non-uniform linear antenna array with optimized inter-element spacing and excitation amplitude using Particle Swarm Optimization (PSO). The aim of the proposed algorithm is to obtain the optimum values for inter-element spacing and excitation amplitude for a linear antenna array in a given radiatio
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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10. Adaptive Wideband Beamforming Based on Digital Delay Filter
Abstract A novel adaptive wideband beamforming method is proposed, where beamforming is achieved by LMS based space-time adaptive filtering algorithm. Conventional broadband beamforming requires desired signal to be incident from the broadside i.e. direction normal to the array. The new method overcome this constraint by make use of digital delay filters whi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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11. Quality Evaluation of Chromatic Interpolation Algorithms for Image Acquisition System
ABSTRACT The main goal of the Libertad 2 mission is to take images of the Earth’s surface in the visible spectrum with a multispectral sensor and send them as a Bayer array. To carry out the reconstruction in land of these images and to view them in a RGB color model, it is necessary to use a color interpolation algorithm to determine the values of the dif
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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12. Nulls and side lobe levels control in a time modulated linear antenna array by optimizing excitations and element locations using RGA
In this paper a novel approach based on the Real coded Genetic Algorithm (RGA) is proposed to improve nulling performance as well as suppression of Side Lobe Level (SLL) of a Time Modulated Linear Antenna Arrays (TMLA). RGA adjusts the static excitation amplitudes as well as the location of each element from the origin to place deeper nulls in the desired di
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12