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Ara es mostren els items 119-138 de 169

    • Radio-frequency interference location, detection and classification using deep neural networks 

      Pérez Portero, Adrián; Querol Borràs, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2020)
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      Global Navigation Satellite System (GNSS) signals are used in Earth Observation for Radio Occultation and Reflectometry. The increasing effects of Radio-Frequency Interferences (RFI) on the performance of these receivers ...

    • Radiometric resolution of motion-induced synthetic aperture radiometer 

      Hyuk, Park; Camps Carmona, Adriano José; Choi, Min Gyu; Kim, Yong-Hoon (2011-07)
      Article
      Accés restringit per política de l'editorial
      The radiometric resolution of a motion-induced synthetic aperture radiometer (MISAR) is analytically obtained from the standard deviation of a baseline response, an observation scenario, and the imaging method of the MISAR. ...

    • Ranking methodology for sequential band selection combining data dispersion and spectral band correlation 

      Llaveria Godoy, David; Camps Carmona, Adriano José; Hyuk, Park; Narayan, Ram (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      Today hyperspectral imagers are capable to capture hundreds of spectral bands simultaneously, while they are getting smaller, fitting in CubeSats. The huge amount of information provided by these sensors is used for numerous ...

    • 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)
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      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 ...

    • Retrieval of significant wave height and mean sea surface level using the GNSS-R interference pattern technique: results from a three-month field campaign 

      Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Martín Alemany, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2015-06-01)
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      Since 1993, when the European Space Agency (ESA) proposed the use of Global Navigation Satellite Systems reflected signals for sea mesoscale altimetry, a wide range of applications have appeared. This paper focuses on the ...

    • 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)
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      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 ...

    • RFI analysis and mitigation in airborne GNSS-R campaign 

      Querol Borràs, Jorge; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Castellví Esturi, Jordi; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Radio-Frequency Interference (RFI) is one of the most concerning topics in Global Navigation Satellite Systems (GNSS) and GNSS - Reflectometry (GNSS-R) because any undesired signal present at the antenna can corrupt the ...

    • RFI mitigation in microwave radiometry using the Karhunen–Loève transform 

      Díez García, Raúl; Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Article
      Accés obert
      This study presents a new signal-processing method to mitigate radio-frequency interference (RFI), based on the Karhunen–Loève transform (KLT). The main property of this method is that it is adaptive and RFI-agnostic, that ...

    • SAIRPS: a generic simulator for evaluation of synthetic aperture interferometric radiometers 

      Camps Carmona, Adriano José; Hyuk, Park; Kang, Yujin; Barbosa, José; Bandeiras, J.; Vieira, Paula; Friaças, Ana; D'Addio, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      ESA's SMOS mission has been a cornerstone in passive Earth Observation, since it has provided for the first time ever with global and frequent observations of Soil Moisture and Ocean Salinity (where the mission acronym ...

    • Satellite cross-talk impact analysis in airborne interferometric global navigation satellite system-reflectometry with the microwave interferometric reflectometer 

      Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Rudiger, Christoph; Walker, Jeffrey; Monerris Belda, Alessandra (Multidisciplinary Digital Publishing Institute (MDPI), 2019-05-01)
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      This work analyzes the satellite cross-talk observed by the microwave interferometric reflectometer (MIR), a new global navigation satellite system (GNSS) reflectometer, during an airborne field campaign in Victoria and ...

    • Sea ice concentration and sea ice extent mapping with L-Band microwave radiometry and GNSS-R data from the FFSCat mission using neural networks 

      Llaveria Godoy, David; Muñoz Martin, Joan Francesc; Herbert, Christoph Josef; Pablos Hernández, Miriam; Hyuk, Park; Camps Carmona, Adriano José (Multidisciplinary Digital Publishing Institute (MDPI), 2021-03-17)
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      CubeSat-based Earth Observation missions have emerged in recent times, achieving scientifically valuable data at a moderate cost. FSSCat is a two 6U CubeSats mission, winner of the ESA S3 challenge and overall winner of ...

    • Sea target detection using spaceborne GNSS-R delay-doppler maps: theory and experimental proof of concept using TDS-1 data 

      Di Simone, Alessio; Hyuk, Park; Riccio, Daniele; Camps Carmona, Adriano José (2017-09-01)
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      This study addresses a novel application of global navigation satellite system-reflectometry (GNSS-R) delay-Doppler maps (DDMs), namely sea target detection. In contrast with other competing remote sensing technologies, ...

    • Selection of the key earth observation sensors and platforms focusing on applications for Polar Regions in the scope of Copernicus system 2020-2030 

      Lancheros Sepulveda, Estefany Maria; Camps Carmona, Adriano José; Hyuk, Park; Rodríguez, Pedro; Tonetti, Stefania; Cote, Judith; Pierotti, Stéphane (Multidisciplinary Digital Publishing Institute (MDPI), 2019-01-01)
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      An optimal payload selection conducted in the frame of the H2020 ONION project (id 687490) is presented based on the ability to cover the observation needs of the Copernicus system in the time period 2020–2030. Payload ...

    • Sensitivity of delay Doppler map in spaceborne GNSS-R to geophysical variables of the ocean 

      Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2022-10-05)
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      Accés obert
      Global Navigation Satellite Systems reflectometry (GNSS-R) is a particular case of a multistatic radar in which the signals transmitted by navigation satellites are the signals of opportunity. These signals can be processed ...

    • Sensitivity of GNSS-R spaceborne observations to soil moisture and vegetation 

      Camps Carmona, Adriano José; Hyuk, Park; Pablos Hernández, Miriam; Foti, Giuseppe; Gommenginger, Christine; Pang-Wei, Liu; Judge, J. (2016-10-01)
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      Accés obert
      Global navigation satellite systems-reflectometry (GNSS-R) is an emerging remote sensing technique that makes use of navigation signals as signals of opportunity in a multistatic radar configuration, with as many transmitters ...

    • Sensitivity of TDS-1 GNSS-R reflectivity to soil moisture: global and regional differences and impact of different spatial scales 

      Camps Carmona, Adriano José; Vall-llossera, M.; Hyuk, Park; Portal González, Gerard; Rossato, Luciana (Multidisciplinary Digital Publishing Institute (MDPI), 2018-11-01)
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      Accés obert
      The potential of Global Navigation Satellite Systems-Reflectometry (GNSS-R) techniques to estimate land surface parameters such as soil moisture (SM) is experimentally studied using 2014-2017 global data from the UK ...

    • Sensitivity of the DDM peak to geophysical variables 

      Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      GNSS-R (Global Navigation Satellite Systems Reflectometry) can be understood as a multi-static radar with as many transmitters as navigation satellites and in view and can be tracked. GNSS-Reflectometers can process the ...

    • Sensitivity to Soil Moisture and Observation Geometry of Spaceborne GNSS-R Delay-Doppler Maps 

      Hyuk, Park; Camps Carmona, Adriano José; Castellví Esturi, Jordi; Vall-Llossera Ferran, Mercedes Magdalena; Portal González, Gerard; Spatafora, Luciana Rossato (2019)
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      Thanks to the successful operations of the UK TDS-1 and NASA CYGNSS GNSS-R missions, a wealth of Delay-Doppler Maps (DDM) are being measured from the ocean, but also from land reflections. Using the land reflected DDM, ...

    • Sensitivity to soil moisture of spaceborne GNSS-R observables 

      Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena; Hyuk, Park; Portal González, Gerard; Rossato, Luciana (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      The potential of GNSS-R techniques to estimate land surface parameters such as Soil Moisture (SM) is experimentally studied using 2014-2017 global data from the UK TechDemoSat-1 (TDS-1) mission. The approach is based on ...

    • Ships and ice monitoring with improved revisit time using GNSS-R constellation 

      Di Simone, Alessio; Hyuk, Park; Riccio, D; Camps Carmona, Adriano José (2016)
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