Ara es mostren els items 1-20 de 23

    • A general analysis of the impact of digitization in microwave correlation radiometers 

      Bosch Lluís, Xavier; Ramos Pérez, Isaac; Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park (2011-06)
      Article
      Accés obert
      This study provides a general framework to analyze the effects on correlation radiometers of a generic quantization scheme and sampling process. It reviews, unifies and expands several previous works that focused on these ...
    • Advanced architectures for real-time delay-doppler map GNSS-reflectometers: the GPS reflectometer instrument for PAU (griPAU) 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac (2010-07-15)
      Article
      Accés restringit per política de l'editorial
      In recent years Global Navigation Satellite System’s signals Reflectometry (GNSS-R) has stood as a potential powerful remote sensing technique to derive scientifically relevant geophysical parameters such as ocean altimetry, ...
    • Altimetry study performed using an airborne GNSS-reflectometer 

      Rodríguez Álvarez, Nereida; Acevo Herrera, René; Aguasca Solé, Alberto; Valencia Domènech, Enric; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Bosch Lluís, Xavier; Ramos Pérez, Isaac (2010)
      Comunicació de congrés
      Accés obert
      The Global Navigation Satellite Signals Reflections (GNSSR)techniques have been widely used for remote sensing purposes retrieving geophysical parameters over different types of surfaces. Over the ocean, altimetry or sea ...
    • Calibration, performance, and imaging tests of a fully digital synthetic aperture interferometer radiometer 

      Ramos Pérez, Isaac; Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena (2012-06-28)
      Article
      Accés restringit per política de l'editorial
      This work presents the calibration, characterization, and imaging tests of the Passive Advanced Unit-Synthetic Aperture instrument (PAU-SA). PAU-SA is a fully digital -shaped two-dimensional synthetic aperture interferometric ...
    • Common mathematical framework for real and synthetic aperture by interferometry radiometers 

      Bosch Lluís, Xavier; Ramos Pérez, Isaac; Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2014-01)
      Article
      Accés restringit per política de l'editorial
      This work focuses on the relationship between real and synthetic aperture radiometers giving a general and common mathematical framework for both of them. It will be demonstrated that a real aperture radiometer array ...
    • Experimental evaluation of GNSS-reflectometry altimetric precision using the P(Y) and C/A signals 

      Carreño Luengo, Hugo; Camps Carmona, Adriano José; Ramos Pérez, Isaac; Rius Jordán, Antonio (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      This work describes a novel dual-band Global Navigation Satellite Systems Reflectometer (GNSS-R) that uses the P(Y) and C/A signals scattered over the sea surface to perform highly precise altimetric measurements. The ...
    • Impact of the observation geometry on the GNSS-R direct descriptors used for sea state monitoring 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Hyuk, Park; Rodriguez Alvarez, N.; Ramos Pérez, Isaac (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In recent years GNSS-R has been proposed for ocean remote sensing, both for altimetry and scatterometry. For the later, two main approaches are available: fitting the measurements with a model, or using some observable ...
    • Land monitoring using GNSS-R techniques: a review of recent advances 

      Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Forte Veliz, Giuseppe Francesco; Ramos Pérez, Isaac; Alonso Arroyo, Alberto; Bosch Lluís, Xavier (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Soil moisture is required to improve meteorological and climate predictions. Global soil moisture maps are nowadays produced daily from SMOS satellite data, with a basic spatial resolution of ~50 km. Recently, using data ...
    • New instrument concepts for ocean sensing: analysis of the PAU-radiometer 

      Camps Carmona, Adriano José; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Marchán Hernández, Juan Fernando; Izquierdo Fernandez, Benjamin; Rodríguez Álvarez, Nereida (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-10-31)
      Article
      Accés obert
      Sea surface salinity can be remotely measured by means of L-band microwave radiometry. However, the brightness temperature also depends on the sea surface temperature and on the sea state, which is probably today one of ...
    • Ocean monitoring using GNSS-R techniques and microwave radiometry: The pau instrument concept 

      Camps, Adriano; Bosch, Xavier; Ramos Pérez, Isaac; Marchán Hernández, Juan Fernando; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida (SARTI (Technological Development Centre of Remote Acquisition and Data processing Systems), 2010-03-10)
      Article
      Accés obert
    • Ocean surface's scattering coefficient retrieval by delay-doppler map inversion 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Hyuk, Park; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac (2011-07)
      Article
      Accés restringit per política de l'editorial
      Global navigation satellite system reflectometry of signals is a promising technique to remotely sense a number of Earth’s geophysical parameters, and it has been proposed for ocean monitoring applications such as mesoscale ...
    • On the use of GNSS-R data to correct L-band brightness temperatures for sea-state effects: results of the ALBATROSS field experiments 

      Valencia Domènech, Enric; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac; Eugenio, Francisco Javier; Marcello, Javier (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Accés restringit per política de l'editorial
      Sea surface salinity is a key oceanographic parameter that can be measured by means of L-band microwave radiometry. The measured brightness temperatures over the ocean are influenced by the sea state, which can entirely ...
    • Optimum intercalibration time in synthetic aperture interferometric radiometers: application to SMOS 

      Ramos Pérez, Isaac; Bosch Lluís, Xavier; Camps Carmona, Adriano José; González Gambau, Veronica; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park; Vall-Llossera Ferran, Mercedes Magdalena; Forte Veliz, Giuseppe Francesco (2012)
      Article
      Accés restringit per política de l'editorial
      Interpolation strategies for calibration of the Soil Moisture and Ocean Salinity (SMOS) mission of the European Space Agency are tested and compared. Calibration strategy (how and how often) is critical in achieving the ...
    • PAU instrument aboard INTA MicroSat-1: A GNSS-R demonstration mission for sea state correction in L-band radiometry 

      Rius, Antonio; Angulo, Manuel; Chavero, Sergio; Martinez, Pedro; Galindo, Juan Jose; Mollfulleda, Antonio; Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Valencia Domènech, Enric; Ramos Pérez, Isaac; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Hyuk, Park; Alcayde Egea, Antonio (IEEE, 2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Global Navigation Satellite System (GNSS) Reflectometry was originally proposed for mesoscale altimetry, but today its feasibility for sea state, soil moisture, vegetation and snow height has already been demonstrated. ...
    • PAU-SA: a synthetic aperture interferometric radiometer test bed for potential improvements in future missions 

      Ramos Pérez, Isaac; Camps Carmona, Adriano José; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Hyuk, Park; Forte Veliz, Giuseppe Francesco; Vall-Llossera Ferran, Mercedes Magdalena (2012-06)
      Article
      Accés obert
      The Soil Moisture and Ocean Salinity (SMOS) mission is an Earth Explorer Opportunity mission from the European Space Agency (ESA). Its goal is to produce global maps of soil moisture and ocean salinity using the Microwave ...
    • Pau-synthetic aperture: a new instrument to test potential improvements for future interferometric radiometers 

      Ramos Pérez, Isaac (Universitat Politècnica de Catalunya, 2012-02-27)
      Tesi
      Accés obert
      The Soil Moisture and Ocean Salinity (SMOS) mission is an Earth Explorer Opportunity mission from the European Space Agency (ESA). It was a direct response to the global observations of soil moisture and ocean salinity. ...
    • Retracking considerations in spaceborne GNSS-R altimetry 

      Hyuk, Park; Camps Carmona, Adriano José; Valencia Domènech, Enric; Rodríguez Álvarez, Nereida; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Carrero Luengo, Hugo (2012-10)
      Article
      Accés restringit per política de l'editorial
      The European Space Agency Passive Reflectometry and Interferometry System In-orbit Demonstrator (IoD) aims to perform mesoscale altimetric observations by measuring the Global Navigation Satellite System (GNSS) opportunity ...
    • Review of GNSS-R instruments and tools developed at the Universitat Politecnica de Catalunya-Barcelona Tech 

      Camps Carmona, Adriano José; Marchán Hernández, Juan Fernando; Bosch Lluís, Xavier; Rodríguez Álvarez, Nereida; Ramos Pérez, Isaac; Valencia Domènech, Enric; Tarongí Bauzá, José Miguel; Hyuk, Park; Carreño Luengo, Hugo; Alonso Arroyo, Alberto; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Forte Veliz, Giuseppe Francesco; Querol Borràs, Jorge (2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Reflectometry using Global Navigation Satellite System's signals of opportunity (GNSS-R) was originally conceived in the early 90s for mesoscale altimetry, and since then, many studies have shown its applicability to other ...
    • Snow monitoring using GNSS-R techniques 

      Rodríguez Álvarez, Nereida; Aguasca Solé, Alberto; Valencia Domènech, Enric; Bosch Lluís, Xavier; Ramos Pérez, Isaac; Hyuk, Park; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      GNSS-R techniques are currently being studied to remotely sense a number of geophysical parameters over different types of surfaces [1-6]. The Interference Pattern Technique (IPT) is based on the measurement of the ...
    • Study of maize plants effects in the retrieval of soil moisture using the interefence Ppttern GNSS-R technique 

      Rodríguez Álvarez, Nereida; Bosch Lluís, Xavier; Acevo Herrera, René; Aguasca Solé, Alberto; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Ramos Pérez, Isaac; Valencia Domènech, Enric (2010)
      Comunicació de congrés
      Accés obert
      The use of Global Navigation Satellite Signals Reflections (GNSS-R) techniques to retrieve geophysical parameters from surfaces has been increased in the recent years. These techniques have resulted in suitable tools to ...