Ara es mostren els items 21-40 de 67

    • Cross-talk statistics and impact in interferometric GNSS-R 

      Pascual Biosca, Daniel; Hyuk, Park; Onrubia Ibáñez, Raúl; Alonso Arroyo, Alberto; Querol Borràs, Jorge; Camps Carmona, Adriano José (2016-06-23)
      Article
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      This paper presents a statistical analysis of the crosstalk phenomenon in interferometric Global Navigation Satellite Systems Reflectometry (iGNSS-R). Crosstalk occurs when the Delay-Doppler Map (DDM) of a tracked satellite ...
    • Design and performance analysis of advanced GNSS-R instruments back-end 

      Pascual Biosca, Daniel (Universitat Politècnica de Catalunya, 2020-12-21)
      Tesi
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      GNSS reflectometry (GNSS-R) is a set of techniques that uses the reflected GNSS signals over the Earth’s surface as opportunity signals for remote sensing applications. In 1993, the European Space Agency (ESA) suggested ...
    • Determination of sea correlation time at L-Band with airborne reflected new GNSS signals 

      Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Castellví Esturi, Jordi; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      The maximum coherent integration time of GNSS reflected (GNSS-R) signals over sea depends on the sea state, as well as on the geometry formed by the receiver, the GNSS satellite and the reflection point. In this paper, ...
    • DME/TACAN impact analysis on GNSS reflectometry 

      Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Hyuk, Park; Camps Carmona, Adriano José (2016-05-31)
      Article
      Accés obert
      Global navigation satellite system reflectometry (GNSS-R) is becoming a widely accepted technique for remote sensing. The interferometric technique (iGNSS-R) correlates the direct signal received from a satellite and the ...
    • Dual-polarization GNSS-R interference pattern technique for soil moisture mapping 

      Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Aguasca Solé, Alberto; Forte Veliz, Giuseppe Francesco; Monerris Belda, Alessandra; Rudiger, Christoph; Walker, Jeffrey; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      The interference pattern technique (IPT) consists of the coherent addition of the direct and reflected global navigation satellite systems (GNSS) signals in the receiving antenna. The detected power oscillates (fading), ...
    • Evolution of PAU/PARIS End-to-end performance simulator (P2EPS) towards GNSS reflectometry, radio occulation and scatterometry simulator (GEROS-SIM) 

      Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Alonso Arroyo, Alberto; Martin Alemayny, Francisco (2015)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work shows a state-of-the-art GNSS reflectometry endto-end performance simulator, selected for the ESA’s GNSS rEflectometry, Radio Occultation and Scatterometry onboard International Space Station (GEROS-ISS). For ...
    • Experimental evidence of swell signatures in airborne L5/E5a GNSS-reflectometry 

      Muñoz Martin, Joan Francesc; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Rudiger, Christoph; Walker, Jeffrey; Monerris Belda, Alessandra (Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-29)
      Article
      Accés obert
      As compared to GPS L1C/A signals, L5/E5a Global Navigation Satellite System-Reflectometry (GNSS-R) improves the spatial resolution due to the narrower auto-correlation function. Furthermore, the larger transmitted power ...
    • First Delay Doppler Maps obtained with the Microwave Interferometric Reflectometer (MIR) 

      Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Alonso Arroyo, Alberto; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      The use of Global Navigation Satellite System (GNSS) signals for mesoscale altimetry was first proposed in [1]. Since then, many experiments and a couple of space missions have been carried out to validate the concept in ...
    • First experimental evidence of wind and swell signatures in L5 GPS and E5A Galileo GNSS-R waveforms 

      Muñoz Martin, Joan Francesc; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Rudiger, Christoph; Walker, Jeffrey; Monerris Belda, Alessandra (2020)
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      As compared to the using L1C/A signals, L5/E5a Global Navigation Satellite System - Reflectometry (GNSS-R), gives improved resolution over the Earth's surface due to the sharper auto-correlation function. Furthermore, the ...
    • 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)
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      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 ...
    • 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 ...
    • 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)
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      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)
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      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. ...
    • L-band vegetation optical depth estimation using transmitted GNSS signals: Application to GNSS-reflectometry and positioning 

      Camps Carmona, Adriano José; Alonso Arroyo, Alberto; Hyuk, Park; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Querol Borràs, Jorge (Multidisciplinary Digital Publishing Institute (MDPI), 2020-08-01)
      Article
      Accés obert
      At L-band (1–2 GHz), and particularly in microwave radiometry (1.413 GHz), vegetation has been traditionally modeled with the τ-ω model. This model has also been used to compensate for vegetation effects in Global Navigation ...
    • MIR: the microwave interferometric reflectometer, a new airborne sensor for GNSS-R advanced research 

      Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Camps Carmona, Adriano José; Alonso Arroyo, Alberto; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      The use of Global Navigation Satellite Signals (GNSS) in reflectometric applications (GNSS-R) is highly extended in remote sensing applications, such as sensing sea state, soil moisture or ice layer characterization. There ...
    • 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
      Accés obert
      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 ...
    • Optimal interleaving for robust wireless JPEG 2000 images and video transmission 

      Pascual Biosca, Daniel; Agueh, Max (Springer Berlin Heidelberg, 2011)
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      In this paper we study the impact of interleaving on JPEG2000 images and video transmission through wireless channels. Based on interleaving impact evaluation, we derive a lower bound limit for the successful images ...
    • 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 ...
    • 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)
      Text en actes de congrés
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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: 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 ...