Now showing items 1-20 of 166

    • A cylindrical array for fast microwave tomography 

      de los Reyes, Elías; Jofre Roca, Lluís; Broquetas Ibars, Antoni; Elias Fusté, Antoni; Cardama Aznar, Ángel (Unión Científica Internacional de Radio (URSI), 1987)
      Conference report
      Open Access
    • A Ku-band geosynchronous synthetic aperture radar mission analysis with medium transmitted power and medium-sized antenna 

      Ruiz, Josep; Broquetas Ibars, Antoni; Monti Guarnieri, Andrea; Rocca, Fabio (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      In this paper, the feasibility of a geosynchronous satellite for Synthetic Aperture Radar applications is assessed. The nearly fixed position of geosynchronous satellites offers new features to SAR acquisition such as ...
    • A near field 3D radar imaging technique 

      Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1993)
      Conference report
      Open Access
      The paper presents an algorithm which recovers a 3D reflectivity image of a target from near-field scattering measurements. Spherical wave nearfield illumination is used, in order to avoid a costly compact range installation ...
    • A near field spherical wave inverse synthetic aperture radar technique 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel (Institute of Electrical and Electronics Engineers (IEEE), 1992)
      Conference report
      Open Access
      The authors present an imaging near-field spherical wave inverse synthetic aperture radar (SWISAR) algorithm based on a focusing operator of the scattered fields on the target surface. A spherical wave can be easily generated ...
    • A performance evaluation of SAR-GMTI missions for maritime applications 

      Makhoul Varona, Eduardo; Broquetas Ibars, Antoni; Ruiz Rodon, Josep; Zhan, Yu; Ceba Vega, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2015-05-01)
      Article
      Open Access
      This paper proposes a new optimized multichannel synthetic aperture radar (SAR) configuration, based on receiving antennas with nonuniformly displaced phase centers, intended for ground moving target indication (GMTI) ...
    • A polarimetric ultra-wide band field scatterometer 

      Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 1995)
      Conference report
      Open Access
      “TERESA” (Terrestrial Radar Equipment for Scattering Analysis) is a ground-based, fully polarimetric scatterometer operative in the S, C, X, and Ku bands. It has been designed to obtain the complete backscattering matrix ...
    • A pulsed carrier recovery using a discrete conception of the PLL 

      Aguasca Solé, Alberto; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1992)
      Conference report
      Open Access
      A bistatic radar system requires accurate synchronization between the transmitter and the remote receiver in order to achieve a correct coherent target detection and positioning. An unlinked receiver carrier phase/frequency ...
    • Accuracy assessment of SAR interferometry using the ERS-1 

      Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1995)
      Conference report
      Open Access
      A SAR raw data simulator and a SAR processor are used as a tool for performance assessment of SAR interferometry algorithms like the multi-baseline and multifrequency. Traditional algorithms have also been tested with real ...
    • Active microwave computed brain tomography: The response to a challenge 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991-02)
      Article
      Restricted access - publisher's policy
      The potential application of active microwave techniques to brain imaging is studied by numerical simulations and experimentally using a recently developed cylindrical microwave scanner. The potential advantages and ...
    • Active microwave imaging: a cylindrical system for biomedical applications 

      Jofre Roca, Lluís; Broquetas Ibars, Antoni; Hawley, Mark (1988)
      Conference report
      Open Access
      The authors examine the use of active microwave tomography as an imaging technique which gives information on the dielectric properties of the body. They show that a cylindrical system is an efficient option to obtain ...
    • Active microwave sensing of highly contrasted dielectric bodies 

      Broquetas Ibars, Antoni; Mallorquí Franquet, Jordi Joan; Rius Casals, Juan Manuel; Jofre Roca, Lluís; Cardama Aznar, Ángel (1993-11)
      Article
      Restricted access - publisher's policy
      In this work the active tomographic imaging of biological bodies which exhibits a high dielectric contrast is studied. Two approaches based on the Born approximation are presented: a differential reconstruction method which ...
    • Actividades del grupo EEF en el contexto de la red europea TMR "Polarimetría radar: Teoría y aplicaciones" 

      Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Broquetas Ibars, Antoni (2000)
      Conference report
      Open Access
      The activity of the EEF group in the TMR European Project Radar Polarimetry: Theory and Applications will be presented in this paper. We have developed new polarimetric-interferometric retrieval algorithms and enhancement ...
    • Advanced radar geosynchronous observation system: ARGOS 

      Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Recchia, Andrea; Rocca, Fabio; Ruiz Rodon, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2015-07-01)
      Article
      Open Access
      The Advanced Radar Geosynchronous Observation System is proposed to be a multiple-input–multiple-output synthetic aperture radar (SAR) system hosted on a swarm of minisatellites in quasi-geostationary orbits. The system ...
    • Algoritmo interferométrico para un sistema radar de apertura sintética circular de corto alcance 

      Sagués Piella, Lluís; Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni (1997)
      Conference report
      Open Access
      This paper presents an interferometric algorithm capable of working with SAR images obtained from measurements carried out with antennas that describe a circular trajectory. The antennas are positioned on a vertical mast ...
    • Algoritmos de tomografía de microondas para objetos de alto contraste 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís (Universidad Politécnica de Madrid (UPM), 1988)
      Conference report
      Open Access
      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 ...
    • 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)
      Conference report
      Open Access
      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 efficient method for the azimuth compression of geosynchronous SAR data through sub-apertures processing 

      Belotti, Michele; Broquetas Ibars, Antoni; Leanza, Antonio; Monti Guarnieri, Andrea; Recchia, Andrea; Rocca, Fabio; Ruiz Rodon, Josep; Tebaldini, Stefano (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      We propose an efficient method for the azimuth compression and Atmospheric Phase Screen estimation of Geosynchronous SAR data. The method is based on the iterative processing of sub-apertures of increasing size, allowing ...
    • An example from the Basic Engineering Project subject at the UPC Telecom-BCN School: learning radiofrequency links, antennas and amplifiers with the help of recycled materials 

      Rocadenbosch Burillo, Francisco; Aguasca Solé, Alberto; Broquetas Ibars, Antoni; Camps Carmona, Adriano José (2018)
      Conference report
      Open Access
    • Analysis and reduction of the distortions induced by time-domain filtering techniques in network analyzers 

      Porrata-Dòria i Yagüe, Ramir de; Broquetas Ibars, Antoni; Martínez, Luís Fernando (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-08-31)
      Article
      Open Access
      The removal of isolation errors plays an essential role in the calibration process of radar scattering measurements. One of the most common techniques used for that purpose is time-domain filtering, also known as gating. ...
    • Analysis of differential correction techniques for orbit determination interferometry 

      Fernández Usón, Marc; Martin Fuster, Roger; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference lecture
      Restricted access - publisher's policy
      Orbit determination errors are expected to be a major threat for obtaining focused images on Geostationary Synthetic Aperture Radar (GeoSAR) missions. A ground-based interferometer system is presently being under research ...