Now showing items 41-60 of 203

    • 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
      Open Access
      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)
      Conference report
      Open Access
      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 ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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
      Open Access
      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)
      Conference report
      Open Access
      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; Gutiérrez, C.; Martín Neira, Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
      Article
      Open Access
      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; Martín Neira, Manuel; Gutiérrez, C. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
      Article
      Open Access
      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)
      Conference lecture
      Open Access
      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)
      Conference report
      Open Access
    • Diseño de un PLO a 2.4 GHz con subsistemas no ideales 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi (1992)
      Conference report
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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)
      Conference report
      Open Access
      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
      Open Access
      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)
      Conference report
      Open Access
    • Exact representation of antenna system diversity performance from input parameter description 

      Blanch Boris, Sebastián; Romeu Robert, Jordi; Corbella Sanahuja, Ignasi (2003-05-31)
      Article
      Open Access
      A simplc formulation Io compute thc envelope correlation of an antenna divemiry system is dcrired. 11 is shown how to compute the envelope correlation hom the S-parameter descnplian of the antenna system. This approach ...
    • Examen Final 

      Corbella Sanahuja, Ignasi; Fàbregas Bargalló, Xavier; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2017-06-19)
      Exam
      Restricted access to the UPC academic community
    • Examen Final 

      Aguasca Solé, Alberto; Corbella Sanahuja, Ignasi (Universitat Politècnica de Catalunya, 2013-06-10)
      Exam
      Restricted access to the UPC academic community
    • Examen Final 

      Corbella Sanahuja, Ignasi; Fàbregas Bargalló, Xavier; López, C; Torres Torres, Francisco; Vall-Llossera Ferran, Mercedes Magdalena (Universitat Politècnica de Catalunya, 2016-06-08)
      Exam
      Restricted access to the UPC academic community
    • Examen Final 

      Aguasca Solé, Alberto; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Mateu, J.; O'Callaghan Castellà, Juan Manuel; Pradell i Cara, Lluís; Torres Torres, Francisco (Universitat Politècnica de Catalunya, 2014-01-10)
      Exam
      Restricted access to the UPC academic community