Ara es mostren els items 1-20 de 71

    • A comparison of phase unwrapping techniques in synthetic aperture radar interferometry 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      A comparison of different phase unwrapping techniques based on the least mean square error is presented. A testing environment based on simulated interferograms has been created in order to assess the methods described in ...
    • A cylindrical system for quasy-real time microwave tomography 

      Jofre Roca, Lluís; Reyes, E De Los; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Romeu Robert, Jordi; Baquero, M; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 1986)
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      A cylindrical system for biomedical microwave tomography is presented. The circular algorithms and some numerical reconstructions are discussed. Finally the experimental set-up is described and some preliminary measurements ...
    • A hybrid modal-boundary element method for electromagnetic scattering from arbitrary conducting wedges 

      Cruellas Ibarz, Juan Carlos; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1990)
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      A hybrid technique is used to determine the electromagnetic scattering contribution of arbitrary conducting wedges in electrically large objects. The boundary integral equation is discretized in a fictitious contour, and ...
    • A new hybrid mode-matching method for the analysis of inductive obstacles and discontinuities 

      Boria Esbert, Vicente; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      A new and efficient hybrid mode-matching method for the analysis of arbitrarily shaped inductive obstacles and discontinuities is presented. An open-space spectral method is used to model the electrical behavior of the ...
    • A new spectral analysis algorithm for SAR data processing of ScanSAR data and medium resolution data without interpolation 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1998)
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      This paper describes a new approach for ScanSAR data image generation, which performs efficient data processing and multilook operation without the need of interpolation stages. This new technique is based on the spectral ...
    • Admitancia de entrada de una guía rectangular rellena de dieléctrico 

      Jofre Roca, Lluís; Ferrando Bataller, Miquel; Cardama Aznar, Ángel (Unión Científica Internacional de Radio (URSI), 1983)
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      A variational formulation, based in a plane wave angular decomposition, is developped for the admitance of a rectangular dielectric-filled waveguide, radiating in a half space.
    • Algoritmos de tomografía de microondas para objetos de alto contrastre 

      Broquetas Ibars, Antoni; Ferrando Bataller, Miquel; Jofre Roca, Lluís (Universidad Politécnica de Madrid (UPM), 1988)
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      Conventional first order algorithms used in microwave tomography often fail to reconstruct biological bodies due to their high contrast in permittivity. The paper presents several methods to improve the applicability of ...
    • An adaptive multiresolution method for speckle noise reduction in synthetic aperture radar images 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      This paper introduces a method for speckle noise reduction based on multiresolution algorithms and a new adaptive approach. It combines the characteristics for additive noise reduction of soft thresholding with the ...
    • An interference analysis on cellular mobile radiocommunications using CAD/CAE techniques 

      Marti, Javier; Cardona, Narcís; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1992)
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      The cochannel interference in a base-station's receiver of one cell produced by a mobile in another cell that uses the same frequency is studied. An OMNISYS simulation model of channel-plus-receiver is proposed and used ...
    • Analysis of inhomogeneous and anisotropic waveguides by the finite element method 

      Ferrando Bataller, Miquel (IEEE Press, 1993)
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      Two numerically efficient procedures for the analysis of arbitrarily-shaped inhomogeneous and anisotropic waveguides showing no spurious modes are considered. The first is based on a transverse magnetic-field formulation, ...
    • Analysis of multireflector antenna clusters by spectral methods 

      Boria Esbert, Vicente; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1994)
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      This paper analyzes multireflector antennas making use of spectral domain techniques. The behaviour of the multireflector antenna is determined by means of a transference function that relates the plane wave spectrum of ...
    • Análisis de elementos pasivos de microondas mediante el método de los elementos finitos 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1991)
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      The analysis of arbitrarily-shaped waveguides has been carried out by the Finite Element Method, using two types of elements: triangles with 3 degrees of freedom and triangles with four nodes and 10 degrees of freedom (4 ...
    • Análisis de guiaondas anisótropas mediante el método de los elementos finitos 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1994)
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      Two numerically efficient procedures for the analysis of arbitrarily-shaped inhomogeneous and anisotropic waveguides showing no spurious modes have been considered. The first one is based on a transverse magnetic-field ...
    • Análisis de guiaondas mediante el método de los elementos finitos. Comparación entre distintos tipos de interpolación 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1993)
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      We use the Finite Elements Method to analize waveguides. Several weak and variational formulations of the problem are implemented. For each type of formulation we use besides different kinds of interpolation. The relative ...
    • Análisis de guías de onda de sección arbitraria usando el método de los elementos finitos 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1992)
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      The analysis of the homogeneous parabolic waveguides has been analyzed previously by other authors analytically. In this paper, the Finite Element Method has been applied to solve that problem. The comparison between those ...
    • Análisis de guías parcialmente rellenas de dieléctrico mediante el método de los elementos finitos 

      Ferrando Bataller, Miquel; Cruellas Ibarz, Juan Carlos; Cardama Aznar, Ángel; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1983)
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      The finite element's method is aplied to the study of inhomogenous waveguides of arbitrary cross-section. The fields in the guide are - expanded in a series of bidimensional functions, obtaining a variational expression ...
    • Análisis de problemas de dispersión mediante técnicas espectrales 

      Boria Esbert, Vicente; Ferrando Bataller, Miquel (1998)
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      A method for the analysis of multiple scattering problems, valid both for open-space and guided problems is presented in this paper. The scatterers are first characterised individually by means of a transfer function, and ...
    • Análisis de reflexiones múltiples entre superficies curvas mediante técnicas espectrales 

      Boria Esbert, Vicente; Ferrando Bataller, Miquel (1994)
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      This paper analyzes the reflected fields produced by parabolic and hyperbolic surfaces when an electromagnetic field falls into them. Multireflector antennas, which are integrated by such reflecting surfaces, are studied ...
    • Análisis de transiciones y obstáculos en guías de onda mediante el método de los elementos finitos 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1992)
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      Analysis of arbitrarily-shaped transitions in waveguides, such as inhomogeneous cavities and waveguide junctions, have been formulated by the Finite Element Method, using tetrahedral elements with four degrees of freedom. ...
    • Análisis y medida en campo próximo de antenas parabólicas 

      Jofre Roca, Lluís; Ferrando Bataller, Miquel (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
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      A complet process of design and measurement of parabolic antennas, is presented. We have implemented a set of programs in order to design and analyze the different geometries of parabolic reflectors. The measurements are ...