Now showing items 21-40 of 165

  • Aplicaciones diferenciales de la interferometría SAR 

    Carrasco, D; Esteban, D; Tena, J; López Bonillo, Francisco; Rodríguez, O; Broquetas Ibars, Antoni (1997)
    Conference report
    Open Access
    Synthetic Aperture Radar Interferometry allows the coherent combination of radar images acquired from different viewpoints. The interferogram generated by substracting their phases has got information related to the geometry ...
  • 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 ...
  • Approach to velocity and acceleration measurement in the Bi-Directional SAR imaging mode 

    Mittermayer, Josef; Prats, Pau; Wollstadt, Steffen; Baumgartner, Stefan; López Dekker, Francisco J.; Broquetas Ibars, Antoni; Makhoul Varona, Eduardo; Krieger, Gerhard; Moreira, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    This paper presents an initial analysis of the possibilities for velocity and acceleration m easurement with the Bi- Directional SAR imaging mode (BiDi). It comprises single satellite single path acquisitions as well ...
  • 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 ...
  • ARBRES: Light-weight CW/FM SAR sensors for small UAVs 

    Aguasca Solé, Alberto; Acevo Herrera, René; Broquetas Ibars, Antoni; Mallorquí Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier (2013-03-06)
    Article
    Open Access
    This paper describes a pair of compact CW/FM airborne SAR systems for small UAV-based operation (wingspan of 3.5 m) for low-cost testing of innovative SAR concepts. Two different SAR instruments, using the C and X bands, ...
  • Ascending-descending orbit combination SAR interferometry assessment 

    Carrasco, D; Díaz, J; Broquetas Ibars, Antoni; Arbiol, Roman; CASTILLO, M; Palà, V (ESA Publications Division, 1997)
    Conference report
    Open Access
    Ascending-descending orbit combination for DEM generation is very promising technique which can be used to fill in ome gaps in the DEMs caused by the geometric deformations or SAR images. The benefits from the combination ...
  • Assesment of atmospheric phase screen impact on Geosynchronous SAR 

    Recchia, Andrea; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Ruiz Rodon, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    The paper evaluates the effects of Atmospheric Phase Screen on focused Geosynchronous SAR data. We derive theoretical models for the resolution, the interferometric de-correlation and the induced clutter in presence of an ...
  • Atmospheric phase screen retrieval from GEOSAR long term acquisition 

    Ruiz Rodon, Josep; Broquetas Ibars, Antoni; Monti Guarnieri, Andrea; Rocca, Fabio (2012)
    Conference report
    Restricted access - publisher's policy
    In this paper, a GEOSAR mission with typical LEOSAR parameters but longer integration time to increase the received power is presented. Such systems can provide images of large areas with continuous monitoring. The revisit ...
  • Bistatic geosynchronous SAR for land and atmosphere continuous observation 

    Ruiz Rodon, Josep; Broquetas Ibars, Antoni; Monti Guarnieri, Andrea; Recchia, Andrea (VDE Conference Publications, 2014)
    Conference lecture
    Restricted access - publisher's policy
    In this paper the bistatic SAR observation from low-eccentric nearly zero inclined geosynchronous orbits (GEOSAR) is studied. Two operation frequencies have been analysed with different compromises between spatial resolution ...
  • CA-CFAR para un centro de fusión de datos con estructura serie 

    Castro Fouz, R.; Elias Fusté, Antoni; Broquetas Ibars, Antoni (1990)
    Conference report
    Open Access
  • Calibración polarimetrica de un campo compacto de medida RCS 

    Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
    Conference report
    Open Access
    A polarimetric calibrarion procedure for a compact range RCS measurement system is presented. This merhod is based on a marhematical model which includes al! possible errors. Some RCS measurements and ISAR images are included.
  • CFAR data fusion center with inhomogeneous receivers 

    Elias Fusté, Antoni; Broquetas Ibars, Antoni (1992-01)
    Article
    Open Access
    Detection systems with distributed sensors and data fusion are increasingly used by surveillance systems. A system formed by N inhomogeneous constant false alarm rate (CFAR) detectors (cell-averaging (CA) and ordered ...
  • CFAR data fusion center with inhomogeneous receivers 

    Elias Fusté, Antoni; Broquetas Ibars, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1992-01-02)
    Article
    Open Access
    Detection systems with distributed sensors and data fusion are increasingly used by surveillance systems. A system formed by N inhomogeneous constant false alarm rate (CFAR) detectors (cell-averaging (CA) and ordered ...
  • Characterization of a 94 GHz radiometric imager with mechanical beam-scanning 

    Nova, Enrique; Abril, Jordi; Romeu Robert, Jordi; Broquetas Ibars, Antoni; Torres Torres, Francisco; Jofre Roca, Lluís (IEEE, 2011)
    Conference report
    Restricted access - publisher's policy
    This paper presents the characterization in terms of spatial resolution and radiometric sensitivity of a W-band Total Power Radiometer (TPR). The TPR is based on a heterodyne receiver with 64 dB of gain and 6.5 dB of noise ...
  • Circular synthetic aperture radar (C-SAR) system for ground based applications 

    Broquetas Ibars, Antoni; Porrata-Dòria i Yagüe, Ramir de; Sagués Piella, Lluís; Fabregas Canovas, Francisco Javier; Jofre Roca, Lluís (IEE-INST ELEC ENG, 1997-05-01)
    Article
    Open Access
    The authors present an SAR system capable of obtaining radar images from measurements carried out with antennas that describe a circular trajectory centred outside the target region. The analytical formulation of the ...
  • Collimated beam FMCW radar for vital sign patient monitoring 

    Prat, Arnau; Blanch Boris, Sebastián; Aguasca Solé, Alberto; Romeu Robert, Jordi; Broquetas Ibars, Antoni (2018-12-18)
    Article
    Open Access
    Patient monitoring of vital signals such as breathing rhythm and heart beat rate can be done remotely by the use of a radar system. This approach is advantageous since it does not require any contact with the patient. ...
  • Constant false alarm rate for a radar data fusion center with n parallel dcar 

    Elias Fusté, Antoni; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1990)
    Conference report
    Open Access
    Email Print Request Permissions The performance of a fusion data center for a network of N radar receivers is analyzed. The total probabilities of detection and false alarm are obtained using a rank fusion rule. A constant ...
  • Convergence and stability assessment of Newton-Kantorovich reconstrutin algorithms for microwve tomography 

    Joachimowicz, N.; Mallorquí Franquet, Jordi Joan; Bolomey, J. C. (Jean-Charles); Broquetas Ibars, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-08-31)
    Article
    Open Access
    For newly developed iterative Newton-Kantorovitch reconstruction techniques, the quality of the final image depends on both experimental and model noise. Experimental noise is inherent to any experimental acquisition scheme, ...
  • Cylindrical geometry: a further step in active microwave tomography 

    Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel; Elias Fusté, Antoni; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1991-05-01)
    Article
    Open Access
    A prototype imaging system for active microwave tomography using cylindrical geometry has been developed, making is possible to obtain images of the dielectric properties of biological targets at 2.45 GHz. The system ...
  • Cylindrical geometry: a further step in active microwave tomography 

    Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel; Elias Fusté, Antoni; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1991-05-01)
    Article
    Open Access
    A prototype imaging system for active microwave tomography using cylindrical geometry has been developed, making it possible to obtain images of the dielectric properties of biological targets at 2.45 GHz. This configuration ...