Ara es mostren els items 70-89 de 177

    • G-CLASS: geosynchronous radar for water cycle science – orbit selection and system design 

      Hobbs, Stephen E.; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Calvet, Jean-Christophe; Casagli, Nicola; Chini, Marco; Ferretti, Rossella; Nagler, Thomas; Pierdicca, Nazzareno; Prudhomme, Christel; Wadge, Geoff (John Wiley & sons, 2019-11)
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      Accés obert
      The mission geosynchronous – continental land atmosphere sensing system (G-CLASS) is designed to study thediurnal water cycle, using geosynchronous radar. Although the water cycle is vital to human society, processes on ...
    • Ganancia de detectabilidad en radares de alta resoluciónç 

      Broquetas Ibars, Antoni; Elias Fusté, Antoni (1992)
      Text en actes de congrés
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      The paper presents an evaluation of a high resolution technique intended to enhance the radar detectability of targets. The method is based on the coherent integration of the individually resolved target scatterers. The ...
    • GEMINI: geosynchronous SAR for Earth monitoring by interferometry and imaging 

      Monti Guarnieri, Andrea; Tebaldini, Stefano; Rocca, Fabio; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      Accés restringit per política de l'editorial
      In this paper we discuss a preliminary design for a constellation of geosynchronous (GEO) Synthetic Aperture Radars (SAR). The key design concept is to employ one or more pairs of closely-spaced twin receivers flown ...
    • Generation of precise wide-area geocoded elevation models with ERS SAR data 

      Bara, M; Romero, Matilde E. de; Mora, O; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      The authors present an improved technique for the generation of digital elevation models (DEM), capable of dealing with full scene images (100×100 km) coming from an interferogram obtained with ERS satellite data. Starting ...
    • Geometría de los sistemas radar biestáticos 

      Elias Fusté, Antoni; Vigo Tarrés, J. X.; Broquetas Ibars, Antoni; Aguasca Solé, Alberto (1990)
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    • Geosynchronous SAR focusing with atmospheric phase screen retrieval and compensation 

      Ruiz Rodon, Josep; Broquetas Ibars, Antoni; Monti Guerneri, Andrea; Rocca, Fabio (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Article
      Accés restringit per política de l'editorial
      In this paper, a geosynchronous synthetic aperture radar (SAR) (GEOSAR) mission for atmospheric phase screen (APS) retrieval using a long coherent integration of pulses is analyzed. The nearly fixed position of the ...
    • Ground moving target indication using multi-channel SAR with non-uniform displaced phase centers 

      Makhoul Varona, Eduardo; Broquetas Ibars, Antoni; Ruiz Rodon, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents an evaluation of a post-Doppler spacetime adaptive Processing (STAP) technique for non-uniformly displaced phase center receivers synthetic aperture radar (SAR). Both theoretical and simulation ...
    • Herramienta de calculo de la potencia de clutter producida por perfiles topograficos reales 

      Elias Fusté, Antoni; Broquetas Ibars, Antoni (1991)
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      The surface clutter becames a interference in a radar system that makes it warse. So, ir was built a personal computer tool that obtains the surface clutter power. This tool takes imo consideration the orographic and ...
    • High-speed focusing algorithm for circular synthetic aperture radar (C-SAR) 

      Bara Iniesta, Marc Antoni; Sagués Piella, Lluís; Paniagua Nicolás, Fernando; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier (IEE-INST ELEC ENG, 2000-04-30)
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      Accés obert
      A new algorithm is presented which is capable of generating very fast high-resolution images for circular synthetic aperture radar (C-SAR) systems. Its main characteristic is that it allows the processing of data from such ...
    • Hydrosoil, soil moisture and vegetation parameters retrieval with a C-Band GB-SAR: Campaign implementation and first results 

      Aguasca Solé, Alberto; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier; Mallorquí Franquet, Jordi Joan; Vilalvilla Ornat, Pol; Biscamps Dalmau, Jordi; Llop Casamada, Jordi; Gallart González-Palacio, Montserrat; Gil Moya, Emilio; Gras Moreu, Anna Maria (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      HydroSoil is a measurement campaign, funded by the European Space Agency (ESA), where the temporal evolutions of two crops, barley and corn, have been continuously monitored during the whole crop period by means of a C-band ...
    • Identificación selectiva de centros de dispersion radar utilizando tecnicas ISAR 

      Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
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      This paper presents an ISAR technique which is able to identify the scattering mechanisms in the target structure wich are responsible of each significant lo be of the RCS vs. angle diagram. The technique is based on a ...
    • Impact of clutter decorrelation on Geosynchronous SAR 

      Recchia, Andrea; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Ruiz Rodon, Josep (VDE Conference Publications, 2014)
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      We discuss the effects of the clutter on a Geosynchronous SAR system exploiting long integration times (from minutes to hours) to counteract for spread losses and increase azimuth resolution. Only stable targets will be ...
    • Impact of scene decorrelation on geosynchronous SAR data focusing 

      Recchia, Andrea; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Leanza, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2016-03-01)
      Article
      Accés obert
      We discuss the effects of the clutter on geosynchronous SAR systems exploiting long integration times (from minutes to hours) to counteract for two-way propagation losses and increase azimuth resolution. Only stable targets ...
    • Indoor experiments on polarimetric SAR interferometry 

      Sagués Piella, Lluís; López-Sánchez, Juan Manuel; Fortuny, Joaquim; Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni; Sieber, A. J. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-03-31)
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      Accés obert
      A coherence optimization method, which makes use of polarimetry to enhance the quality of SAR interferograms, has been experimentally tested under laboratory conditions in an anechoic chamber. By carefully selecting the ...
    • Interferometric orbit determination for geostationary satellites 

      Martin Fuster, Roger; Fernández Usón, Marc; Broquetas Ibars, Antoni (2017-06-01)
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      Future GeoSAR missions are expected to provide higher resolution radar images featuring shorter revisit times by locating a radar payload on-board of a geostationary satellite. One of the main challenges in GeoSAR processing ...
    • Interferometric orbit determination system for geosynchronous SAR missions: experimental proof of concept 

      Nicolás Álvarez, Jorge; Carreño Megias, Xavier; Ferrer Torres, Estel; Albert Galí, Miquel; Rodriguez Tersa, Judith; Aguasca Solé, Alberto; Broquetas Ibars, Antoni (Multidisciplinary Digital Publishing Institute (MDPI), 2022-10-01)
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      Accés obert
      Future Geosynchronous Synthetic Aperture Radar (GEOSAR) missions will provide permanent monitoring of continental areas of the planet with revisit times of less than 24 h. Several GEOSAR missions have been studied in the ...
    • Interferometric SAR signal analysis in the presence of squint 

      Bara Iniesta, Marc Antoni; Scheiber, Rolf; Broquetas Ibars, Antoni; Moreira, Alberto (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-09-30)
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      Accés obert
      This paper develops an analysis of the SAR impulse response function from the interferometric point of view, with the intention of studying its phase behavior in the presence of high squint angle values. It will be pointed ...
    • Interferometric SAR signal analysis in the presence of squint 

      Bara, M; Scheiber, Rolf; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      In the following paper an analysis of the SAR impulse response signal from the interferometric point of view is expounded, with the intention of studying its phase behaviour in the presence of high squint values. The work ...
    • Interferometría SAR a partir de datos ERS-1 sobre Tarragona. Análisis de errores 

      Carrasco, D; Alonso, J; Broquetas Ibars, Antoni (1995)
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    • Interferometría SAR con datos de ERS-1 

      Carrasco Díaz, Daniel; SANZ, S; SOUSA, R; Broquetas Ibars, Antoni (1996)
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      SAR Interferometry allows the obtention of digital elevation models (DEM) by combination of two synthetic aperture radar images acquired from slightly different viewpoints. ERS-1 SAR interferometry has already been validated ...