Ara es mostren els items 21-40 de 206

    • Brightness-temperature retrival methods in synthetic aperture radiometers 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (IEEE, 2009-01)
      Article
      Accés obert
      Bightness-temperature retrieval techniques for synthetic aperture radiometers are reviewed. Three different approaches to combine measured visibility and antenna temperatures, along with instrument characterization ...
    • Calibratin of fully polarimetric radiometers: the LAURA radiometer 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Torres Torres, Francisco; Bará Temes, Francisco Javier (2000)
      Text en actes de congrés
      Accés obert
    • Calibration and experimental results of a two-dimensional interferometric radiometer laboratory prototype 

      Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier (1997-09)
      Article
      Accés restringit per política de l'editorial
      In recent years, Earth observation by means of aperture synthesis radiometry has received special attention by some space agencies as a possible solution to achieve high radiometric accuracy and spatial resolution at low ...
    • Calibration and experimental results of a two-dimensional interferometric radiometer laboratory prototype 

      Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Soler, Xavier (American Geophysical Union, 1997-09-01)
      Article
      Accés obert
    • Calibration consistency tool for interferometric radiometers 

      González-Gambau, Verónica; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (2008)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents a method to check the consistency of the amplitude calibration in interferometric radiometers devoted to Earth observation This tool is based in the intrinsic properties of the internal calibration ...
    • Calibration methods in large interferometric radiometers devoted to earth observation 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (VSP, 2000-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This paper starts with a summary and classification of errors of any kind that corrupt the fundamental measurement performed by an InR (interferometric radiometer), the so-called visibilities. This summary is based on prior ...
    • Calibration of aperture synthesis radiometers: the MIRAS/SMOS case 

      Torres Torres, Francisco (2012-07-22)
      Report de recerca
      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). Its single payload, the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS), was launched in November 2009. ...
    • Calibration of the MIRAS Radiometers 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Durán Martínez, Israel; González Gambau, Verónica; Oliva Balagué, Roger; Closa, Josep; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2018-12-21)
      Article
      Accés obert
      The microwave imaging radiometer with aperture synthesis (MIRAS) is formed by 69 total power radiometers, of which three are the noise-injection type. Their calibration is reviewed on the basis of the data gathered during ...
    • Calibration procedures in 2-D large interferometric radiometers study applied to the MIRAS/SMOS instrument 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria (2000)
      Text en actes de congrés
      Accés obert
    • Calibration trade-off in large interferometric radiometers devoted to earth observation 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena (Centro Stampa, 1999)
      Text en actes de congrés
      Accés obert
    • Caracterización del ruido de fase de los subsistemas que integran un oscilador sintetizado 

      Barba, J.M.; Torres Torres, Francisco; Corbella Sanahuja, Ignasi (1992)
      Text en actes de congrés
      Accés obert
      A set of phase noise measurement techniques, based on the HP 3048A system, are compared in terms of major applications and limitations. To ilustrate the items, several significant measures are discussed.
    • Caracterización del ruido de fase de osciladores sintetizados con técnicas PLL 

      Torres Torres, Francisco; Bará Temes, Francisco Javier; Artal, Eduardo; Porta, Albert (1990)
      Text en actes de congrés
      Accés obert
    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Considerations about antenna pattern measurements of 2-D aperture synthesis radiometers 

      Camps Carmona, Adriano José; Skou, Neils; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria (IEEE, 2006-04-30)
      Article
      Accés obert
      Accurate measurement of the antenna voltage patterns of large-aperture synthesis radiometers is critical in order to achieve good radiometric accuracy, and a very time consuming and expensive task. Measurement requirements ...
    • Considerations About Antenna Pattern Measurements of 2-D Aperture Synthesis Radiometers 

      Camps Carmona, Adriano José; Skou, Neils; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria (IEEE, 2006-04-30)
      Article
      Accés obert
      Accurate measurement of the antenna voltage patterns of large-aperture synthesis radiometers is critical in order to achieve good radiometric accuracy, and a very time consuming and expensive task. Measurement requirements ...
    • Contribución al estudio y diseño de osciladores sintetizados de microondas de gran pureza espectral 

      Torres Torres, Francisco (Universitat Politècnica de Catalunya, 1992-11-18)
      Tesi
      Accés obert
      El objetivo de la tesis es estudiar en términos del ruido de fase, el diseño de osciladores de microondas sintetizados. La tesis realiza una revisión tecnológica de los componentes habitualmente empleados, en términos de ...
    • Correcting the FRA systematic error in VTEC maps from SMOS radiometric data 

      Rubino, Roselena; Duffo Ubeda, Núria; González Gambau, Verónica; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Oliva Balagué, Roger; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2022-10-17)
      Article
      Accés obert
      The Faraday rotation (FR) is a nonnegligible effect at the L-band, which is the operation frequency of the Soil Moisture and Ocean Salinity (SMOS) mission. This effect introduces a rotation in the electromagnetic field ...
    • Correction of spatial errors in SMOS brightness temperature images 

      Wu, Lin; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Systematic spatial errors in SMOS brightness temperature images are successfully estimated by using a statistical analysis of measured data. A constant multiplicative mask is derived by averaging spatial errors of a large ...
    • Correlation denormalization in interferometric or polarametric radiometers: a unified approach 

      Colliander, Andreas; Torres Torres, Francisco; Corbella Sanahuja, Ignasi (IEEE, 2009-02)
      Article
      Accés obert
      This paper presents a general analysis of correlation measurements in an interferometer or a radiometer based on noise injection and/or switching and measurement of normalized correlations (e.g., imaging synthetic aperture ...
    • Creació de recursos en línea per a l’autoaprenentage, foment de l’esperit crític i emprenedor i formació d’un comité d’avaluació externa en el màster MERIT 

      Pradell i Cara, Lluís; Cabrera-Bean, Margarita; Canal Bienzobas, Fernando; Cardama Aznar, Ángel; Gasull Llampallas, Antoni; González Arbesú, José María; Giró Nieto, Xavier; Heldring, Alexander; Herranz Luis, Jaime; Jofre Roca, Lluís; Mallorquí Franquet, Jordi Joan; Nadeu Camprubí, Climent; Olmos Bonafé, Juan José; Romeu Robert, Jordi; Rius Casals, Juan Manuel; Torres Torres, Francisco; Úbeda Farré, Eduard; Coderch Collell, Marcel; Kerans, Mary Ellen; Ros Giralt, Jordi; García, Antonio; González Font, Blanca; Guardiola Garcia, Marta; Hernández, Antoni; Melgarejo, Natali; Mestres, Albert (2009-02-12T10:25:51Z)
      Comunicació de congrés / Text en actes de congrés
      Accés obert
      El projecte es desenvolupa en el marc de la titulació oficial de màster MERIT del Departament de Teoria del Senyal i Comunicacions. El màster, orientat a la recerca i integrat dins del programa Erasmus Mundus, presenta ...