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Ara es mostren els items 96-115 de 169

    • 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 ...

    • Ocean target monitoring with improved revisit time using constellations of GNSS-R instruments 

      Di Simone, Alessio; Hyuk, Park; Riccio, Daniele; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      Ships and ice monitoring is of key importance in numerous applications, such as maritime traffic control, prevention of illegal activities, climate change studies, and maritime security. In this work, the feasibility of ...

    • On the correlation between earthquakes and prior ionospheric scintillations over the ocean: a study using GNSS-R data between 2017 and 2021 

      Boudriki Semlali, Badr Eddine; Molina Ordóñez, Carlos; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2024-01-01)
      Article
      Accés obert
      From 1980 to 2021, earthquakes have caused more than 846 000 casualties and about US$ 661 billion in economic losses. At present, there are no reliable earthquake precursors to generate alerts. Currently, the link between ...

    • On the correlation between GNSS-R reflectivity and L-band microwave radiometry 

      Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Monerris Belda, Sandra; Rudiger, Christoph; Walker, Jeffrey; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Hyuk, Park; Pascual Biosca, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2016-12)
      Article
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      This work compares microwave radiometry and global navigation satellite systems-reflectometry (GNSS-R) observations using data gathered from airborne flights conducted for three different soil moisture conditions. Two ...

    • On the potential of empirical mode decomposition for RFI mitigation in microwave radiometry 

      Díez García, Raúl; Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2022-07-04)
      Article
      Accés obert
      Radio-frequency interference (RFI) is an increasing problem particularly for Earth observation using microwave radiometry. RFI has been observed, for example, at L-band by the European Space Agency’s (ESA’s) soil moisture ...

    • On the trade-off between enhancement of the spatial resolution and noise amplification in conical-scanning microwave radiometers 

      Alparone, Matteo; Nunziata, Ferdinando; Estatico, Claudio; Camps Carmona, Adriano José; Hyuk, Park; Migliaccio, Maurizio (2022-01-01)
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      Accés obert
      The ability to enhance the spatial resolution of measurements collected by a conical-scanning microwave radiometer (MWR) is discussed in terms of noise amplification and improvement of the spatial resolution. Simulated ...

    • Optimization and performance analysis of interferometric GNSS-R altimeters: application to the PARIS IoD mission 

      Camps Carmona, Adriano José; Hyuk, Park; Valencia Domènech, Enric; Pascual Biosca, Daniel; Martín Alemany, Francisco; Rius Jordán, Antonio; Ribó Vedrilla, Serni; Benito, Javier; Andres-Beivide, Ana; Saameno, Paula; Staton, Gavin; Martín Neira, Manuel; D'Addio, Salvatore; Willemsen, Philip (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      Reflectometry using Global Navigation Satellite System's signals (GNSS-R) of opportunity was originally conceived in the early 1990 s for mesoscale altimetry, and since then, many studies have shown its applicability to ...

    • 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 ...

    • Orbit design for a satellite swarm-based Motion Induced Synthetic Aperture Radiometer (MISAR) in low-earth orbit for earth observation applications 

      Lützner, Mark; Jagdhuber, Thomas; Camps Carmona, Adriano José; Hyuk, Park; Peichl, Markus; Förstner, Roger; Jirousek, Matthias (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Article
      Accés obert
      Soil Moisture and Ocean Salinity mapping by Earth observation satellites has contributed significantly toward a better understanding of the Earth system, such as its hydrosphere or climate. Nevertheless, an increased spatial ...

    • Parameter considerations for the retrieval of surface soil moisture from spaceborne GNSS-R 

      Muñoz Martin, Joan Francesc; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Rudiger, Christoph; Walker, Jeffrey; Monerris Belda, Alessandra (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      The Microwave Interferometric Reflectometer (MIR) is an airborne GNSS-R instrument developed by Universitat Politècnica de Catalunya. In 2018, it was flown twice over the agricultural Yanco area, New South Wales, Australia, ...

    • 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)
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      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 instrument aboard INTA MicroSat-1: flight model tests 

      Alonso González, Alberto; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Hyuk, Park; Alcayde Egea, Antonio; Chavero, Sergio; Martinez, Pedro; Crespo, Luis; Angulo, Manuel; Rius, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      This work presents the PAU instrument aboard the satellite INTA MicroSAT-1. The PAU instrument is a combination of a Radiometer and a GNSS Reflectometer designed to study the relationship GNSS-R observables (Delay Doppler ...

    • PAU instrument aboard INTA MicroSAT-1: initial results of the FM model from an airborne experiment 

      Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Hyuk, Park; Alcayde Egea, Antonio; Chavero, Sergio; Martinez, Pedro; Crespo, Luis; Angulo, Manuel; Rius, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      This work presents the PAU instrument aboard the satellite INTA MicroSAT-1. The PAU instrument is a combination of a Radiometer and a GNSS Reflectometer designed to study the relationship GNSS-R observables (Delay Doppler ...

    • 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 ...

    • Performance assessment of time–frequency RFI mitigation techniques in microwave radiometry 

      Querol Borràs, Jorge; Onrubia Ibáñez, Raúl; Alonso Arroyo, Alberto; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José (2017-02-14)
      Article
      Accés obert
      Radio–frequency interference (RFI) signals are a well-known threat for microwave radiometry (MWR) applications. In order to alleviate this problem, different approaches for RFI detection and mitigation are currently under ...

    • Phase and amplitude calibration of rotating equispaced circular array for geostationary microwave interferometric radiometers: Simulation results and discussion 

      Guo, Xi; Camps Carmona, Adriano José; Hyuk, Park; Liu, Hao; Zhang, Cheng; Wu, Ji (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      Accés obert
      In the theoretical part of this work, a calibration strategy for both phase and amplitude calibration of rotating equispaced circular array based on redundant space calibration was introduced. It avoids the challenging ...

    • Phase and amplitude calibrations of rotating equispaced circular array for geostationary microwave interferometric radiometers: theory and methods 

      Guo, Xi; Camps Carmona, Adriano José; Hyuk, Park; Liu, Hao; Zhang, Cheng; Wu, Ji (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Article
      Accés obert
      The calibration strategy for synthetic aperture interferometric radiometers based on noise injection has been successfully demonstrated in the Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) instrument onboard ...

    • Phase and baseline calibration for microwave interferometric radiometers sing beacons 

      Hyuk, Park; Camps Carmona, Adriano José; Grubišic, Angelo; Colombo, Camila; Tatnall, Adrian; Sugihara El Maghraby, Ahmed Kiyosi (Institute of Electrical and Electronics Engineers (IEEE), 2020-08-01)
      Article
      Accés obert
      The relative phase and amplitude calibration between individual receiving elements are one of the key challenges in interferometric microwave radiometry. For monolithic interferometers, for example the Microwave Imaging ...

    • Possible evidence of earthquake precursors observed in ionospheric scintillation events observed from spaceborne GNSS-R data 

      Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
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      Several factors may induce perturbations on the ionospheric plasma, changing its average electron density and creating small-scale irregularities, changing its shape and altitude. Solar irradiance and space weather are ...

    • Precision bounds in GNSS-R ocean altimetry 

      Pascual Biosca, Daniel; Camps Carmona, Adriano José; Martínez Mindeguía, Francisco; Hyuk, Park; Alonso Arroyo, Alberto; Onrubia Ibáñez, Raúl (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      Global navigation satellite systems (GNSS) signals offer a promising opportunity to perform mesoscale altimetry with worldwide coverage using small satellites. However, unlike the signals used in classical altimeters, the ...