Exploració per autor "Corbella Sanahuja, Ignasi"Més informacióMés informació

Ara es mostren els items 39-58 de 216

    • Comparación entre medidas AC y DC de resistencias parásitas del circuito equivalente del MEFET 

      Corbella Sanahuja, Ignasi; Pradell i Cara, Lluís (Universidad de Málaga, 1992)
      Text en actes de congrés
      Accés obert

    • Comparación entre técnicas de medida y modelización de transistores MESFET y HEMT discretos hasta 40 GHz 

      Pradell i Cara, Lluís; Corbella Sanahuja, Ignasi; Purroy Martín, Francesc; Cáceres, M. (Universidad de Málaga, 1992)
      Text en actes de congrés
      Accés obert

    • Compensation of elevation angle variations in polarimetric brightness temperature measurements from airborne microwave radiometers 

      Corbella Sanahuja, Ignasi; Gasiewski, A.J.; Klein, Marian; Piepmeier, Jeffrey R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-01-31)
      Article
      Accés obert
      This paper presents a method for compensating the elevation angle fluctuations occurring in airborne radiometry due to aircraft roll and pitch. The correction is based on a radiative transfer model, and is demonstrated by ...

    • 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 ...

    • Control automático de nivel (ALC) de un SSPA en banda Ka 

      Corbella Sanahuja, Ignasi; Purroy Martín, Francesc (1991)
      Text en actes de congrés
      Accés obert
      This communication describes the design of an Automatic Level Control (ALC) for the transmiter of a CODE (Co-operative Olympus Data Experiment) earth station. The goal of the ALC system is to keep constant the transmited ...

    • 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 ...

    • Criterios y métodos de reducción del ruido de fase en osciladores de microondas con MESFET 

      Corbella Sanahuja, Ignasi (1991)
      Text en actes de congrés
      Accés obert
      This paper gives several building criteria for the design of microwave oscillators with MESFET (MESFET-MWO) in order to achieve low phase noise. From device low frequency noise model and identification of phase noise ...

    • Denormalization of visibilities for in-orbit calibration of interferometric radiometers 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Beraza Robledano, Santiago; Martín Neira, Manuel; Gutiérrez, C. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
      Article
      Accés obert
      This paper reviews the relative calibration of an interferometric radiometer taking into account the experimental results of the first batch of receivers developed in the frame of the European Space Agency's Soil Moisture ...

    • Denormalization of visibilities for in-orbit calibration of interferometric radiometers 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Beraza Robledano, Santiago; Gutiérrez, C.; Martín Neira, Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
      Article
      Accés obert
      This paper reviews the relative calibration of an interferometric radiometer taking into account the experimental results of the first batch of receivers developed in the frame of the European Space Agency's Soil Moisture ...

    • Deriving VTEC maps from SMOS radiometric data 

      Rubino, Roselena; Duffo Ubeda, Núria; González Gambau, Verónica; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Durán Martínez, Israel; Martín Neira, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-01)
      Comunicació de congrés
      Accés obert
      In this work, a new methodology is proposed in order to derive vertical total electron content (VTEC) maps from the radiometric measurements of the Soil Moisture and Ocean Salinity (SMOS) mission as an alternative approach ...

    • Diseño de mezcladores armónicos para aplicaciones en lazos de fase PLO a 20 

      Porta, Albert; Artal, Eduardo; Corbella Sanahuja, Ignasi; Purroy, Francesc (1990)
      Text en actes de congrés
      Accés obert

    • Diseño de un PLO a 2.4 GHz con subsistemas no ideales 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi (1992)
      Text en actes de congrés
      Accés obert
      The design of a phase locked oscillator -PLO- using real components is presented. The procedure takes into account the main subsystem non-idealities: residual phase noise and high frequency parasitic behaviour of the ...

    • Downscaling SMOS-derived soil moisture using MODIS visible/infrared data 

      Piles, Maria; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Corbella Sanahuja, Ignasi; Panciera, Rocco; Ruediger, Christoph; Kerr, Yann H.; Walker, Jeffrey (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Accés restringit per política de l'editorial
      A downscaling approach to improve the spatial resolution of Soil Moisture and Ocean Salinity (SMOS) soil moisture estimates with the use of higher resolution visible/infrared (VIS/IR) satellite data is presented. The ...

    • Dynamic range and linearity tradeoff in detectors for interferometric radiometers 

      Torres Torres, Francisco; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2003-12)
      Article
      Accés obert
      The dynamic range and error performance of the diode power detector used to denormalise the digital correlations in interferometric radiometers is analysed by means of a second-order model of the diode response. This ...

    • El "Olympus Propagation Experiment (OPEX)". Aspectos del cabezal de R.F. de las estaciones receptoras 

      Comerón Tejero, Adolfo; Bara, Javier; Elias Fusté, Antoni; Corbella Sanahuja, Ignasi; Artal, Eduardo (1985)
      Text en actes de congrés
      Accés obert
      The design guidelines for a coherent receiver for the Olympus propagation experiment at 12.5, 20 and 30 GHz are discussed. The receiver channels can be locked to a main PLL in the 12.5 GHz channel, thus decreasing the loss ...

    • End-to-end Simulator of 2-D Interferometric Radiometry 

      Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Zapata González, Miguel; Marcos, Fernando; Martínez, Francisco; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria; Bará Temes, Francisco Javier (AMER GEOPHYSICAL UNION, 2003-07-31)
      Article
      Accés obert
      An end-to-end simulator for the assessment of the performances of a spaceborne interferometric radiometer measuring the brightness temperature of Earth’s surface (ground and sea) is presented. The tool covers the complete ...

    • Evaluation of MIRAS space borne instrument performance: snap shot radiometric accuracy and its improvement by means of pixel averaging 

      Camps Carmona, Adriano José; Torres Torres, Francisco; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Martín Neira, Manuel (1997)
      Text en actes de congrés
      Accés obert