Ara es mostren els items 21-40 de 43

  • First Delay Doppler Maps obtained with the Microwave Inteferometric Reflectometer (MIR) 

    Pascual, 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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    This work presents the first Delay Doppler Maps (DDMs) obtained with the Microwave Interferometric Reflectometer (MIR) airborne instrument. MIR is a GNSS Reflectometer (GNSS-R) which uses the conventional (cGNSS-R) and ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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)
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    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 ...
  • 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 ...
  • 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)
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    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 ...
  • 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)
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    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 ...
  • Preliminary altimetry results of the Malygnss instrument in the Humit project 

    Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Querol Borràs, Jorge; Castellví Esturi, Jordi; Corbera Fauria, Jordi; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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    In order to provide high resolution soil moisture maps, the Institut Cartografic i Geológic de Catalunya (ICGC) in colab-oration with Universitat Politecnica de Catalunya are planing to deploy the 3 Cat-3 picosatellite, ...
  • Preliminary results of FENIX: front-end GNSS interference eXcisor 

    Querol Borràs, Jorge; Julián Ortín, Eva Maria; Onrubia Ibáñez, Raúl; Alonso Arroyo, Alberto; Pascual Biosca, Daniel; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    The number of applications based on Global Navigation Satellite Systems (GNSS) has been increasing in last years. In the passive remote sensing field, GNSS-Reflectometry (GNSS-R) systems have been revealed as cost-effective ...
  • 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 ...
  • Simulation and analysis of GNSS-R composite waveforms using GPS and Galileo signals 

    Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José; Alonso Arroyo, Alberto; Onrubia Ibáñez, Raúl (2014-05-01)
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    Nowadays, several global navigation satellite system (GNSS) services coexist at L-band and some more will be available in the near future. These new signals were originally conceived to enhance the location accuracy, but ...
  • Simulation study on tropicial cyclone tracking from the ISS using GNSS-R measurements 

    Hyuk, Park; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Alonso Arroyo, Alberto; Martín Alemany, Francisco; Carreño Luengo, Hugo; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    Global Navigation Satellite System Reflectometry (GNSS-R) has been emerged as a new opportunity for satellite remote sensing. From the bistatic measurement of GNSS-R, various geophysical parameters can be retrieved. This ...
  • SNR and standard deviation of cGNSS-R and iGNSS-R scatterometric measurements 

    Alonso Arroyo, Alberto; Querol Borràs, Jorge; López Martínez, Carlos; Zavorotny, Valery U.; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Camps Carmona, Adriano José (2017-01-19)
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    This work addresses the accuracy of the Global Navigation Satellite Systems (GNSS)-Reflectometry (GNSS-R) scatterometric measurements considering the presence of both coherent and incoherent scattered components, for both ...
  • SNR degradation in GNSS-R measurements under the effects of radio-frequency interference 

    Querol Borràs, Jorge; Alonso Arroyo, Alberto; Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Hyuk, Park; Camps Carmona, Adriano José (2016-08-24)
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    Radio-frequency interference (RFI) is a serious threat for systems working with low power signals such as those coming from the global navigation satellite systems (GNSS). The spectral separation coefficient (SSC) is the ...
  • Soil moisture mapping using forward scattered GPS L1 signals 

    Alonso Arroyo, Alberto; Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Jové Casulleras, Roger (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    This work presents a novel technique for the determination of soil moisture obtaining 2-D Soil Moisture (SM) information with a single instrument. Both the instrument and the retrieval algorithm used, which is based on ...
  • The dual polarization GNSS-R interference pattern technique 

    Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Monerris Belda, Sandra; Ruudiger, C.; Walker, Jeffrey; Forte Veliz, Giuseppe Francesco; Pascual Biosca, Daniel; Hyuk, Park; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    Since 2003 several field experiments using Global Navigation Satellite Systems (GNSS)-Reflectometry (GNSS-R) have demonstrated the feasibility of retrieving Soil Moisture (SM) from GNSS-R observations. Different techniques ...
  • The light airborne reflectometer for GNSS-R observations (LARGO) instrument: initial results from airborne and Rover field campaigns 

    Alonso Arroyo, Alberto; Camps Carmona, Adriano José; Monerris Belda, Sandra; Rudiger, Christoph; Walker, Jeffrey; Forte Veliz, Giuseppe Francesco; Pascual Biosca, Daniel; Hyuk, Park; Onrubia Ibáñez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    Global Navigation Satellite Systems (GNSS)-Reflectometry (GNSS-R) has proved to be a useful technique for the estimation of Soil Moisture (SM). In the past 10 years, different techniques such as the Interference Pattern ...
  • The microwave interferometric reflectometer. Part I: front-end and beamforming description 

    Onrubia Ibáñez, Raúl; Pascual Biosca, Daniel; Camps Carmona, Adriano José; Alonso Arroyo, Alberto; Hyuk, Park (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    The Microwave Interferometric Reflectometer (MIR) is a new airborne reflectometer being developed at Catalonia Polytechnic University (UPC) that uses Global Navigation Satellite Systems (GNSS) to retrieve mainly altitude ...