Now showing items 21-40 of 50

  • 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)
    Conference report
    Restricted access - publisher's policy
    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)
    Conference report
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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. ...
  • 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
    Open Access
    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 ...
  • Land monitoring using GNSS-R techniques: a review of recent advances 

    Camps Carmona, Adriano José; Rodríguez Álvarez, Nereida; Valencia Domènech, Enric; Forte Veliz, Giuseppe Francesco; Ramos Pérez, Isaac; Alonso Arroyo, Alberto; Bosch Lluís, Xavier (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
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    Soil moisture is required to improve meteorological and climate predictions. Global soil moisture maps are nowadays produced daily from SMOS satellite data, with a basic spatial resolution of ~50 km. Recently, using data ...
  • 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)
    Conference report
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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 ...
  • Multisensor experiments over vineyard: new challenges for the GNSS-R technique 

    Sanchez, Nilda; Alonso Arroyo, Alberto; Martinez Fernandez, Jose; Camps Carmona, Adriano José; Gonzalez Zamora, Angel; Pablos Hernández, Miriam; Herrero Jimenez, Carlos M.; Gumuzzio, Angela (2015)
    Conference lecture
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    An airborne campaign was performed during August, 2014 in an agricultural area in the Duero basin (Spain) in order to appraise the synergy between very different sources of Earth Observation imagery, and very different ...
  • On the synergy of airborne GNSS-R and landsat 8 for soil moisture estimation 

    Sanchez, Nilda; Alonso Arroyo, Alberto; Martinez Fernandez, Jose; Piles Guillem, Maria; Gonzalez Zamora, Angel; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2015-08-01)
    Article
    Open Access
    While the synergy between thermal, optical, and passive microwave observations is well known for the estimation of soil moisture and vegetation parameters, the use of remote sensing sources based on the Global Navigation ...
  • PAU instrument aboard INTA MicroSAT-1: initial results of the FM model from an airborne experiment 

    Alonso Arroyo, 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)
    Conference report
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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 ...
  • 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)
    Article
    Open Access
    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)
    Article
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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 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)
    Conference report
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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 ...
  • Recent advances in land monitoring using GNSS-R techniques 

    Camps Carmona, Adriano José; Forte Veliz, Giuseppe Francesco; Ramos, I.; Alonso Arroyo, Alberto; Martinez, Philippe; Crespo, Luis; Alcayde Egea, Antonio (2012)
    Conference report
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    Soil moisture and land surface’s temperature are proxys of forest fires risk. In the frame of the DANTE project, ADTelecom (Barcelona, Spain) is working in the design of an instrument: 1) to estimate the risk of forest ...
  • 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)
    Article
    Open Access
    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)
    Conference lecture
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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 ...
  • Sea ice detection using GNSS-R data from UK TDS-1 

    Alonso Arroyo, Alberto; Zavorotny, Valery U.; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    This work demonstrates a methodology to detect sea ice presence over the Arctic and Antarctic regions using Global Navigation Satellite Systems (GNSS)-Reflectometry (GNSS-R) data obtained with the UK TDS-1 satellite. The ...
  • Sea ice detection using UK TDS-1 GNSS-R data 

    Alonso Arroyo, Alberto; Zavorotny, Valery U.; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017-09-01)
    Article
    Open Access
    A sea ice detection algorithm developed using the U.K. TechDemoSat-1 (U.K. TDS-1) global navigation satellite systems (GNSSs)-reflectometry data over the Arctic and Antarctic regions is presented. It is based on measuring ...
  • 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)
    Article
    Restricted access - publisher's policy
    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)
    Conference lecture
    Restricted access - publisher's policy
    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)
    Article
    Open Access
    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)
    Article
    Open Access
    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 ...