Ara es mostren els items 132-151 de 216

    • Ocean salinity observations with SMOS mission 

      Martín Neira, Manuel; Font Capafons, Josep; Srokerz, M; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José (IEEE Piscataway, 2000)
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      The purpose of this paper is to present the capabilities of SMOS (Soil Moisture and Ocean Salinity mission) for the global mapping of ocean salinity from space. SMOS has been selected by the European Space Agency as the ...
    • On Board Accurate Calibration of Dual-Channel Radiometers Using Internal and External References 

      Corbella Sanahuja, Ignasi; Gasiewski, A.J.; Klein, Marian; Leuski, Vladimir; Francavilla, A. J.; Piepmeier, Jeffrey R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-07-31)
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      This paper presents a method for combining internal noise injection and external reference standard looks to accurately calibrate an airborne dual-channel radiometer. The method allows real-time estimation of the correct ...
    • On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to miras 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Ferrero, R Pintor (Institute of Electrical and Electronics Engineers (IEEE), 1996-07)
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      On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements ...
    • On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to miras. 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Ferrero Pintor, Roberto (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-07-01)
      Article
      Accés obert
      On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements ...
    • On-ground characterization of the SMOS payload 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín Neira, Manuel; González Gambau, Veronica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-09)
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      The on-ground characterization of the synthetic aperture radiometer onboard the Soil Moisture and Ocean Salinity mission is described. Characterization includes basic functionality, internal calibration, thermal cycling, ...
    • One-point microwave radiometer calibration 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Closa Soteras, Josep; Duffo Ubeda, Núria; Durán Martínez, Israel; González Gambau, Verónica; Martín Neira, Manuel (2020-03-01)
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      A method for internally calibrating microwave total power radiometers by using only one level of noise injection is presented. It is based on having a previous accurate characterization of the receiver noise temperature, ...
    • Optimum Redundant Array Configurations for Earth Observation Aperture Synthesis Microwave Radiometers 

      Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (2002-09-30)
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      Two-dimensional aperture synthesis radiometry is the technology selected for ESA's SMOS mission to provide high resolution L-band radiometric imagery. The array topology is a Y-shaped structure. The position and number ...
    • Performance of a spatial error correction technique in SMOS brightness temperature images 

      Wu, Lin; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      Accés restringit per política de l'editorial
      Soil Moisture and Ocean Salinity (SMOS) brightness temperature synthesized images are obtained after a comprehensive calibration and error correction procedure. However, the final images are stil ...
    • Performance Of Sea Surface Salinity And Soil Moisture Retrieval Algorithms With Different Auxiliary Datasets In 2-D L-Band Aperture Synthesis Interferometric Radiometers 

      Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Batres Gonzalez, Luis; Torres Torres, Francisco; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi (IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, INC, 2005-05-31)
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      The Soil Moisture and Ocean Salinity (SMOS) Earth Explorer Opportunity Mission was selected in May 1999 by the European Space Agency Earth Observation Programme Board to provide global and frequent soil moisture (SM) and ...
    • Performance of sea surface salinity and soil moisture retrieval algorithms with different auxiliary datasets in 2-D L-band aperture synthesis interferometric radiometers 

      Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Batres Gonzalez, Luis; Torres Torres, Francisco; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-05-31)
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      The Soil Moisture and Ocean Salinity (SMOS) Earth Explorer Opportunity Mission was selected in May 1999 by the European Space Agency Earth Observation Programme Board to provide global and frequent soil moisture (SM) and ...
    • Phase error assessment of MIRAS/SMOS by means of the redundant space calibration 

      Dávila, Rubén; Torres Torres, Francisco; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi; Pablos Hernández, Miriam; Martín-Neira, Manuel (IEEE, 2011)
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      Accés restringit per política de l'editorial
      SMOS is the acronym for the Soil Moisture and Ocean Salinity mission by the European Space Agency (ESA) [1]. Its single payload, the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS), was successfully launched ...
    • PLL de microondas con tiempo de adquisición reducido 

      Berenguer Sau, Jordi; Artal, E.; Corbella Sanahuja, Ignasi; Comerón Tejero, Adolfo (1986)
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      The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation. ...
    • PLL de microondas con tiempo de adquisición reducido 

      Berenguer Sau, Jordi; Artal, E.; Corbella Sanahuja, Ignasi; Comerón Tejero, Adolfo (1986)
      Text en actes de congrés
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      The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation. ...
    • Polarimetric emission of rain events: simulation and experimental results at X-Band 

      Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco (2009-06)
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      Accurate models are used today for infrared and microwave satellite radiance simulations of the first two Stokes elements in the physical retrieval, data assimilation etc. of surface and atmospheric parameters. Although ...
    • Polarimetric Formulation Of The Visibility Function Equation Including Cross-Polar Antenna Patterns 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria (IEEE Geoscience and Remote Sensing Letters, 2005-07-31)
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      The European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission will be the first one using two-dimensional aperture synthesis radiometry for Earth observation. This study presents the formulation that relates ...
    • Polarimetric formulation of the visibility function equation including cross-polar antenna patterns 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria (2005-07)
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      The European Space Agency’s Soil Moisture and Ocean Salinity (SMOS) mission will be the first one using two-dimensional aperture synthesis radiometry for earth observation. This study presents the formulation that relates ...
    • Practical issues on SMOS single antenna patterns 

      Wu, Lin; Durán Martínez, Israel; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Closa, Josep; Manrique, Rodrigo; Garcia, Quiterio; Oliva Balagué, Roger; Martín Neira, Manuel (2014)
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      This paper provides a wrap-up of some of the activities undertaken by SMOS L1 team to fine tune the instrument calibration and modeling that eventually has resulted into a SMOS full-polarimetric measurement and image ...
    • Processing and initial comparison of PSR data from CAMEX-3 to SSM/I and TMI data 

      Serke, D; Gasiewski, A J; Klein, M; Leuski, V; Francavilla, A; Piepmeier, J R; Corbella Sanahuja, Ignasi (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      A multiband Polarimetric Scanning Radiometer (PSR) was integrated on a NASA DC-8 aircraft and flown from August through September of 1998 during the third Convection and Moisture Experiment (CAMEX-3). The PSR is a new ...
    • Radar Doppler de bajo coste como sensor de alarma en tecnología impresa 

      de los Reyes, Elías; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Corbella Sanahuja, Ignasi (1981)
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      General configurations for homodyne Doppler Radars for intruder detection are presented. A prototype on microstrip technology has been realized which exhibits excellent performances at a low component cost. This prototype ...
    • Radiació i propagació. Fulls de resposta laboratori 

      Corbella Sanahuja, Ignasi; Fabregas Canovas, Francisco Javier; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena (2013-07-09)
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