Ara es mostren els items 67-86 de 165

    • High angular resolution RFI localization in synthetic aperture interferometric radiometers using direction-of-arrival estimation 

      Hyuk, Park; González Gambau, Veronica; Camps Carmona, Adriano José (2015-01-01)
      Article
      Accés obert
      Radio-frequency interference (RFI) seriously affects the retrieval of geophysical parameters from the measurements of microwave radiometers. An accurate geolocation of the RFI is crucial to effectively switch off illegal ...
    • Hurricane observations with GNSS-reflectometry from CYGNSS mission - case study of Hurricane Irma 2017 

      Guan, Dongliang; Camps Carmona, Adriano José; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In this study, the ability of GNSS-R technique to observe and track hurricane is investigated from the CYGNSS mission, as the specular reflection points tracks pass through the eye of Hurricane Irma. The clear variations ...
    • Impact of doppler frequency compensation errors on spaceborne GNSS-R altimetry 

      Hyuk, Park; Camps Carmona, Adriano José; Valencia Domènech, Enric (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The compensation of the Doppler frequency error is important to accurately estimate the sea height in spaceborne GNSSR altimetry. This work presents the impact of the residual Doppler error on the altimetric performance. ...
    • Impact of multi-path by ISS structure on GEROS-ISS measured waveforms 

      Hyuk, Park; Camps Carmona, Adriano José; Sekulic, Ivan; Rius Casals, Juan Manuel; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Querol Borràs, Jorge; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The GNSS rEflectometry, Radio Occultation and Scatterometry onboard the International Space Station (GEROS-ISS) experiment consists of the installation of a GNSS reflectometry (GNSS-R) instrument on the International Space ...
    • Impact of the elevation angle in the coherence time as a function of the sea wave height 

      Martín Alemany, Francisco; Camps Carmona, Adriano José; Martín-Neira, Manuel; d'Addio, Salvatore; Fabra Cervellera, Fran; Rius Jordán, Antonio; Hyuk, Park (2015)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      For a given geometry, the coherence time of a GNSS-R waveform can be initially related to the significant wave height.However, when the coherence time is analyzed, several issues shall be considered, such as the geometry ...
    • 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 ...
    • Implementation of a GNSS-R payload based on software defined radio for the 3CAT-2 mission 

      Olivé Muñiz, Roger; Amézaga Sarries, Adrià; Carreno-Luengo, Hugo; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016-10-01)
      Article
      Accés obert
      The 3CAT-2 nanosatellite aims at demonstrating global navigation satellite system reflectometry (GNSS-R) techniques for spaceborne applications in the small form of a six-unit CubeSat. There are many challenges involved ...
    • Implementation of a testbed for GNSS-R payload performance evaluation 

      Pérez Portero, Adrián; Muñoz Martin, Joan Francesc; Querol, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2020-05-28)
      Article
      Accés obert
      The functional performance of space-borne instruments must be validated on ground before and after satellite integration. The effects of radio-frequency interference are also becoming more important, even in protected bands ...
    • Improved gnss-r altimetry methods: Theory and experimental demonstration using airborne dual frequency data from the microwave interferometric reflectometer (mir) 

      Cervelló i Nogués, Oriol; Muñoz Martín, Joan Francesc; Hyuk, Park; Camps, Adriano; Onrubia Ibáñez, Raul; Pascual Biosca, Daniel; Rudiger, Christoph; Walker, Jeffrey; Monerris Belda, Alessandra (Multidisciplinary Digital Publishing Institute (MDPI), 2021-10-01)
      Article
      Accés obert
      Altimetric performance of Global Navigation Satellite System - Reflectometry (GNSS-R) instruments depends on receiver’s bandwidth and signal-to-noise ratio (SNR). The altimetric delay is usually computed from the time ...
    • Improved MUSIC-based SMOS RFI source detection and geolocation algorithm 

      Hyuk, Park; Gonzalez Gambau, Verónica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2016-03-01)
      Article
      Accés obert
      The European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission has been providing L-band brightness temperature (BT) using its instrument, the Microwave Imaging Radiometer using Aperture Synthesis. In the ...
    • Improvement of PAU/PARIS end-to-end performance simulator (P2EPS): land scattering including topography 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Querol Borràs, Jorge; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work presents an improvement of the P2EPS end-to-end simulator to assess the performances of Global Navigation Satellite System Reflectometry (GNSS-R) space missions over land. Beyond the single specular reflection ...
    • Improvement of the PAU/PARIS End-to-end Performance Simulator (P^2 EPS) in preparation for upcoming GNSS-R missions 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Martín Alemany, Francisco; Carreño Luengo, Hugo (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      PAU/PARIS End-to-end Performance Simulator (P2EPS) has been developed for studying and design tools for GNSS-R space mission. For the purpose of accuracy and various scenario, P2EPS has recently improved in many features. ...
    • Improving the accuracy of soil moisture retrievals using the phase difference of the dual-polarization GNSS-R interference patterns 

      Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Aguasca Solé, Alberto; Forte, G.; Monerris Belda, Sandra; Ruediger, Christoph; Walker, Jeffrey; Hyuk, Park; Pascual, D.; Onrubia Ibáñez, Raúl (2014-12-01)
      Article
      Accés obert
      Soil moisture (SM) is a key parameter in the climate studies at a global scale and a very important parameter in applications such as precision agriculture at a local scale. The Global Navigation Satellite Systems Interference ...
    • In-orbit validation of the FMPL-2 dual microwave payload onboard the Fsscat Mission 

      Muñoz Martin, Joan Francesc; Fernandez Capon, Lara Pilar; Pérez Portero, Adrián; Hyuk, Park; Ruiz De Azúa Ortega, Juan Adrián; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The Flexible Microwave Payload -2 is the microwave remote sensing payload of the FSSCat mission. The instrument is the outcome of years of work of the Universitat Politécnica de Catalunya Passive Remote Sensing Laboratory, ...
    • In-orbit validation of the fmpl-2 instrument—the gnss-r and l-band microwave radiometer payload of the fsscat mission 

      Muñoz Martin, Joan Francesc; Fernandez Capon, Lara Pilar; Pérez Portero, Adrián; Ruiz De Azúa Ortega, Juan Adrián; Hyuk, Park; Camps Carmona, Adriano José; Carnicero Domínguez, Bernardo; Pastena, Massimiliano (Multidisciplinary Digital Publishing Institute (MDPI), 2021-01-01)
      Article
      Accés obert
      The Flexible Microwave Payload-2 is the GNSS-R and L-band Microwave Radiometer Payload on board 3Cat-5/A, one of the two 6-unit CubeSats of the FSSCat mission, which were successfully launched on 3 September 2020 on Vega ...
    • Innovative sea surface monitoring with GNSS-REflectometry aboard ISS: overview and recent results from GEROS-ISS 

      Wickert, Jens; Baltazar Andersen, Ole; Bandeiras, J.; Bertino, Laurent; Cardellach, Estel; Camps Carmona, Adriano José; Catarino, Nuno; Chapron, Bertrand; Foti, Giuseppe; Gommenginger, Christine; Hatton, Jason; Høeg, Peter; Jaggi, A.; Kern, Michael; Lee, T.; Martín-Neira, Manuel; Hyuk, Park; Pierdicca, Nazzareno; Font-Rosselló, Josep; Semmling, Maximilian; Shum, C.K.; Zuffada, Cinzia; Soulat, François; Sousa, Anna; Xi, J. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés obert
      GEROS-ISS (GEROS hereafter) stands for GNSS REflectometry, Radio Occultation and Scatterometry onboard the International Space Station. It is a scientific experiment, proposed to the European Space Agency (ESA) in 2011 for ...
    • Instrument needs for the Copernicus space infrastructure in the timeframe 2020–2030 

      Lancheros Sepulveda, Estefany Maria; Camps Carmona, Adriano José; Hyuk, Park; Rodríguez, Pedro; Tonetti, Stefania; Matevosyan, H.; Lluch, I.; Sicard, Michaël; Mangin, A. (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work is part of “Operational Network of Individual Observation Nodes” (ONION). ONION is an H2020 project devoted to identify solutions and to satisfy emerging needs of the European Earth Observation (EO) market. In ...
    • Ionospheric effects in GNS-reflectometry from space 

      Camps Carmona, Adriano José; Hyuk, Park; Foti, Giuseppe; Gommenginger, Christine (2016-12-01)
      Article
      Accés obert
      Global navigation satellite systems-reflectometry (GNSS-R) is an emerging technique that uses navigation opportunistic signals as a multistatic radar. Most GNSS systems operate at L-band, which is affected by the ...
    • Ionospheric effects in GNSS-reflectometry from pace 

      Camps Carmona, Adriano José; Hyuk, Park; Foti, Giuseppe; Gommenginger, Christine (2016-12-01)
      Article
      Accés obert
      Global navigation satellite systems-reflectometry (GNSS-R) is an emerging technique that uses navigation opportunistic signals as a multistatic radar. Most GNSS systems operate at L-band, which is affected by the ionosphere. ...
    • Ionospheric scintillation anomalies associated with the 2021 La Palma volcanic eruption detected with Gnss-R and Gnss-Ro observations 

      Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; González Casado, Guillermo; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Recent studies have shown possible signatures or precursors of seismic activity in the ionosphere. Our group is focusing on ionospheric scintillation associated with seismic activity. By the time this study was conducted, ...