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Ara es mostren els items 1-20 de 169

    • 3CAT-3/MOTS, an experimental nanosatellite for multispectral and GNSS-R earth observation: airborne optical and GNSS-R campaign 

      Castellví Esturi, Jordi; Camps Carmona, Adriano José; Onrubia Ibáñez, Raúl; Alamús, Ramón; Pascual Biosca, Daniel; Querol Borràs, Jorge; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      The 3 Cat-3/MOTS mission is a joint initiative between the Institut Cartogràfic i Geològic de Catalunya (ICGC) and the Universitat Politècnica de Catalunya-BarcelonaTech (UPC) to foster new and innovative technologies on ...

    • 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)
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      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 ...

    • A generic level 1 simulator for spaceborne GNSS-R missions and application to GEROS-ISS ocean reflectometry 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Kang, Yujin; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Alonso Arroyo, Alberto (2017-07-18)
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      In the past decade Global Navigation Satellites System Reflectometry (GNSS-R) has emerged as a new technique for earth remote sensing for various applications, such as ocean altimetry and sea state monitoring. After the ...

    • A generic simulator for aperture synthesis radiometers 

      Camps Carmona, Adriano José; Hyuk, Park; Barbosa Torralbo, José; Bandeiras, J.; D'Addio, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      ESA's SMOS mission has demonstrated that Synthetic Aperture Interferometric Radiometers can be a useful tool for Earth observation. Today, the NASA's GeoStar instrument (USA), ESA's GAS instrument (Europe), or CSSAR's GIMS ...

    • A generic simulator for aperture synthesis radiometers: Radiative transfer module and end-to-end tests 

      Camps Carmona, Adriano José; Hyuk, Park; Barbosa, José; Bandeiras, J.; Sousa, Ana; d'Addio, Salvatore; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      The Synthetic Aperture Interferometric Radiometer (SAIR) Performance Simulator (SAIRPS) is a very versatile software tool developed by Deimos Engenharia (Portugal) and the Universitat Politècnica de Catalunya-Barcelona ...

    • A neural network approach to predict the ionospheric scintillation Wbmod model variables 

      Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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      The ionospheric scintillation can be explained as the fluctuations in the phase and intensity of electromagnetic rays after crossing the ionosphere. Rino’s theory was proposed in 1979 to quantify this scintillation, and ...

    • A preliminary study on ionospheric scintillation anomalies detected using GNSS-R data from NASA CYGNSS mission as possible earthquake precursors 

      Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; Hyuk, Park; Camps Carmona, Adriano José (Multidisciplinary Digital Publishing Institute (MDPI), 2022-05-26)
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      Ionospheric perturbations affect the propagation of electromagnetic waves. These perturbations, besides being a problem for space communications, satellite navigation, and Earth observation techniques, could also be used ...

    • A radio-frequency interference detector for GNSS navigation and GNSS-reflectometry applications 

      Querol Borràs, Jorge; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      Radio-Frequency Interference (RFI) is a growing problem for applications based on the Global Navigation Satellite Systems (GNSS), including Earth observation using GNSS - Reflectometry (GNSS-R). Nowadays, many efforts are ...

    • Accurate geolocation of rfi sources in smos imagery based on superresolution algorithms 

      Hyuk, Park; Camps Carmona, Adriano José; González Gambau, Veronica (2014)
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      Accurate geolocation of SMOS RFI sources is very important for effectively switching-off the illegal emitter in the protected L-band. We present a novel approach for the geolocation of SMOS RFI sources, based on the Direction ...

    • Advances in the MIR instrument: integration, control subsystem and analysis of the flight dynamics for beamsteering purposes 

      Onrubia Ibáñez, Raúl; Garrucho, Lidia; Pascual Biosca, Daniel; Hyuk, Park; Querol Borràs, Jorge; Alonso Arroyo, Alberto; Camps Carmona, Adriano José (2015)
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      The MIR (Microwave Interferometric Reflectometer) is a new dual frequency Global Navigation Satellite Systems Re- flectometry (GNSS-R) instrument that implements conventional and interferometric reflectometry, both with ...

    • Airborne GNSS-R: A key enabling technology for environmental monitoring 

      Pérez Portero, Adrián; Muñoz Martin, Joan Francesc; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      Accés obert
      Weather forecast using GNSS-R relies, to a large extent, on data acquired by airborne and spaceborne platforms due to the extended coverage that can be achieved. GEO satellites can retrieve measurements over large areas ...

    • Altimetry performance and error budget of the PARIS in-orbit demonstration mission 

      Camps Carmona, Adriano José; Pascual Biosca, Daniel; Hyuk, Park; Martín Alemany, Francisco; Rius, Antonio; Ribó Vedrilla, Serni; Benito, Javier; Andrés, A.; Saameno, Paula; Staton, Gavin; Martín Neira, Manuel; D'Addio, Salvatore; Willemsen, P. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      Reflectometry using Global Navigation Satellite System's signals of opportunity (GNSS-R) was originally conceived for mesoscale altimetry [1], although its applicability to sea state determination, soil moisture, vegetation, ...

    • Altimetry with GNSS-R interferometry: first proof of concept experiment 

      Martín Neira, Manuel; Altena, B.; van Bree, R.; Van Der Marel, H.; Camps Carmona, Adriano José; Rius, Antonio; Nogués Correig, O.; Ribó Vedrilla, Serni; Cardellach, Estel; Oliveras, S.; Valencia Domènech, Enric; Hyuk, Park; Tarongí Bauzá, José Miguel (2012-04)
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      The Global Navigation Satellite System Reflectometry (GNSS-R) concept was conceived as a means to densify radar altimeter measurements of the sea surface. Until now, the GNSS-R concept relied on open access to GNSS ...

    • An enhanced resolution brightness temperature product for future conical scanning microwave radiometers 

      Nunziata, Ferdinando; Alparone, Matteo; Camps Carmona, Adriano José; Hyuk, Park; Zurita Campos, Alberto M.; Estatico, Claudio; Migliaccio, Maurizio (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      An enhanced spatial resolution brightness temperature product is proposed for future conical scan microwave radiometers. The technique is developed for Copernicus Imaging Microwave Radiometer (CIMR) measurements that are ...

    • An FFT-based CLEAN deconvolution method for interferometric microwave radiometers with spatially variable beam pattern 

      Sugihara El Maghraby, Ahmed Kiyosi; Hyuk, Park; Camps Carmona, Adriano José; Grubišic, Angelo; Colombo, Camilla; Tatnall, Adrian (Institute of Electrical and Electronics Engineers (IEEE), 2021-02-01)
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      A modification to the extended CLEAN deconvolution method for passive microwave interferometric radiometers is presented to account for the interferometer beam patterns that vary depending on the source position within the ...

    • An imaging algorithm for synthetic aperture interferometric radiometers with built-in RFI mitigation 

      Camps Carmona, Adriano José; Hyuk, Park; González Gambau, Veronica (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Radio Frequency Interference (RFI) is probably one of the most important limiting factors in the accuracy of the brightness temperatures measured by microwave radiometers. Due to the proximity of the 'protected' L-band ...

    • Analysis of GNSS-R delay and doppler tracking errors 

      Hyuk, Park; Camps Carmona, Adriano José; Valencia Domènech, Enric; Carreño Luengo, Hugo; Martín Alemany, Francisco; Alonso Arroyo, Alberto; Pascual Biosca, Daniel (2012)
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      The compensation of the delay and Doppler errors using tracking is important to accurately estimate the sea height in spaceborne GNSS-R. This work presents the impacts of the tracking residual errors on the GNSS-R observables, ...

    • Analysis of spaceborne GNSS-R delay-doppler tracking 

      Hyuk, Park; Pascual Biosca, Daniel; Camps Carmona, Adriano José; Martínez Mindeguía, Francisco; Alonso Arroyo, Alberto; Carreño Luengo, Hugo (2014-05-01)
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      For spaceborne Global Navigation Satellite System-Reflectometry (GNSS-R), the delay and Doppler frequency conditions dynamically change, so the compensation of the delay and Doppler errors using tracking is important to ...

    • Analysis of the potential of small satellites to cover the sea ice data products gap 

      Lancheros Sepulveda, Estefany Maria; Hyuk, Park; Camps Carmona, Adriano José; Di Simone, Alessio; Matevosyan, H.; Lluch, I. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      This work reviews and analyses potentially relevant technologies to ensure that the gaps and stakeholder needs for sea ice products are covered. Each variable related to sea ice that presenting gaps using the European EO ...

    • Analyzing Anomalous Artefacts in TDS-1 Delay Doppler Maps 

      Hu, Changjiang; Benson, Craig; Hyuk, Park; Camps Carmona, Adriano José; Li, Qiao; Rizos, Chris (2019)
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      Global Navigation Satellite System Reflectometry (GNSS-R) uses the GNSS reflected signals to study parameters of the Earth's surface such as ocean surface height, wind speed, soil moisture, sea surface target detection. ...