Exploració per autor "Martín Neira, Manuel"

Ara es mostren els items 36-55 de 72

    • New methodology for the Faraday rotation angle retrieval in the SMOS field of view 

      Rubino, Roselena; Duffo Ubeda, Núria; González Gambau, Verónica; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In this work, a new methodology to estimate the Faraday Rotation Angle (FRA) from SMOS full-pol brightness temperature is presented. This approach is focused on retrieving the Vertical Total Electron Content (VTEC) and ...

    • Ocean salinity observations with SMOS mission 

      Martín Neira, Manuel; Font Capafons, Josep; Srokerz, M; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José (IEEE Piscataway, 2000)
      Text en actes de congrés
      Accés obert
      The purpose of this paper is to present the capabilities of SMOS (Soil Moisture and Ocean Salinity mission) for the global mapping of ocean salinity from space. SMOS has been selected by the European Space Agency as the ...

    • On-ground characterization of the SMOS payload 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín Neira, Manuel; González Gambau, Veronica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-09)
      Article
      Accés obert
      The on-ground characterization of the synthetic aperture radiometer onboard the Soil Moisture and Ocean Salinity mission is described. Characterization includes basic functionality, internal calibration, thermal cycling, ...

    • One-point microwave radiometer calibration 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Closa Soteras, Josep; Duffo Ubeda, Núria; Durán Martínez, Israel; González Gambau, Verónica; Martín Neira, Manuel (2020-03-01)
      Article
      Accés obert
      A method for internally calibrating microwave total power radiometers by using only one level of noise injection is presented. It is based on having a previous accurate characterization of the receiver noise temperature, ...

    • 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 ...

    • PARIS interferometric technique proof of concept: sea surface altimetry measurements 

      Rius, A.; Fabra Cervellera, Fran; Ribó Vedrilla, Serni; Arco Fernandez, Juan Carlos; Oliveras, S.; Cardellach, Estel; Camps Carmona, Adriano José; Nogués Correig, O.; Kainulainen, J.; Rohue, E.; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
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      We report preliminary results of an aircraft experiment aimed to proof the PARIS Interferometric Technique. The experiment was performed in the Gulf of Finland during a two hours flight.We installed a PARIS Interferometric ...

    • Performance of a spatial error correction technique in SMOS brightness temperature images 

      Wu, Lin; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Soil Moisture and Ocean Salinity (SMOS) brightness temperature synthesized images are obtained after a comprehensive calibration and error correction procedure. However, the final images are stil ...

    • Practical issues on SMOS single antenna patterns 

      Wu, Lin; Durán Martínez, Israel; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Closa, Josep; Manrique, Rodrigo; Garcia, Quiterio; Oliva Balagué, Roger; Martín Neira, Manuel (2014)
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      This paper provides a wrap-up of some of the activities undertaken by SMOS L1 team to fine tune the instrument calibration and modeling that eventually has resulted into a SMOS full-polarimetric measurement and image ...

    • Radiometric performance of SMOS full polarimetric imaging 

      Wu, Lin; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Durán Martínez, Israel; Vall-Llossera Ferran, Mercedes Magdalena; Camps, Adiano; Delwart, Steven; Martín Neira, Manuel (2013-11)
      Article
      Accés restringit per política de l'editorial
      This work has been conducted in the framework of several projects devoted to assess the performance of the Soil Moisture and Ocean Salinity (SMOS) mission full-pol measurement mode. Since its launch in November 2009, SMOS ...

    • Refining the methodology to correct the faraday rotation angle from SMOS measurements 

      Rubino, Roselena; Duffo Ubeda, Núria; González Gambau, Verónica; Corbella Sanahuja, Ignasi; Durán Martínez, Israel; Torres Torres, Francisco; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, a refined methodology to correct the Faraday Rotation angle (FRA) for the SMOS mission is proposed. The method is based on calculating the FRA using the SMOS full-pol radiometric data to obtain VTEC maps ...

    • Remote sensing of hydrometeors by means of interfermotric radiometry: theory and experimental results 

      Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Camps Carmona, Adriano José; Martín Neira, Manuel; Nesti, G; Olhmer, E (2000-05)
      Article
      Accés restringit per política de l'editorial
      Spaceborne and ground-based radiometric measurements at microwave and millimeterwave frequencies have proved able to monitor hydrometeors, but at present the angular resolution of those systems is limited by the radiometer's ...

    • Residual calibration error impact on SMOS SLL performance 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Durán Martínez, Israel; Lin, Wu; Duffo Ubeda, Núria; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      SMOS Side Lobe Level (SLL), which is caused by the limited coverage of the measured visibility samples in the frequency domain, is responsible for non-negligible radiometric errors at pixels placed close to large brightness ...

    • RFI detection and mitigation for advanced correlators in interferometric radiometers 

      Pérez Portero, Adrián; Querol Borràs, Jorge; Camps Carmona, Adriano José; Martín Neira, Manuel; Suess, Martin; Ramirez, Juan Ignacio; Zurita Campos, Alberto M.; Closa Soteras, Josep; Oliva, Roger; Onrubia Ibáñez, Raul (Multidisciplinary Digital Publishing Institute (MDPI), 2022-09-01)
      Article
      Accés obert
      This work presents the first RFI detection and mitigation algorithm for the interferometric radiometers that will be implemented in its correlator unit. The algorithm operates in the time and frequency domains, applying ...

    • Sea surface emissivity observations at L-band: first results of the Wind and Salinity Experiment WISE 2000 

      Camps Carmona, Adriano José; Font Ferré, Jordi; Etcheto, J; Caselles Costa, Vicent; Weill, A; Corbella Sanahuja, Ignasi; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria; Torres Torres, Francisco; Villarino Villarino, Ramón; Enrique, L; Julia, A; Gabarro, C; Boutin, J; Rubio, E; Reising, S; Wursteisen, P.; Berger, M.; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2002-10)
      Article
      Accés obert
      Sea surface salinity can be measured by passive microwave remote sensing at L-band. In May 1999, the European Space Agency (ESA) selected the Soil Moisture and Ocean Salinity (SMOS) Earth Explorer Opportunity Mission to ...

    • SMOS calibration and instrument performance after one year in orbit 

      Oliva, Ramon; Martín Neira, Manuel; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Kainulainen, J.; Tenerelli, J.; Cabot, F.; Martín Porqueras, F. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Article
      Accés restringit per política de l'editorial
      This paper summarizes the rationale for the European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission routine calibration plan, including the analysis of the calibration parameter annual variability, and the ...

    • SMOS image reconstruction quality assessment 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Wu, Lin; Duffo Ubeda, Núria; Durán Martínez, Israel; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      After more than four years of operation, the SMOS (Soil Moisture and Ocean Salinity) European Space Agency (ESA) mission [1] has proven to be highly useful for a variety of scientific applications related to soil moisture ...

    • SMOS instrument performance after more than 11 years in orbit 

      Martín Neira, Manuel; Oliva, Roger; Onrubia Ibáñez, Raul; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Rubino, Roselena; Kainulainen, Juha; Closa Soteras, Josep; Zurita Campos, Alberto M.; del Castillo, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      ESA's Soil Moisture and Ocean Salinity (SMOS) mission [1] has been in orbit for over 11 years, and its Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) in two dimensions keeps being fully operational. This ...

    • SMOS instrument performance after more than 8 years in orbit and lessons learnt for future L-band missions 

      Martín Neira, Manuel; Oliva Balagué, Roger; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Durán Martínez, Israel; Kainulainen, Juha; Closa Soteras, Josep; Zurita Campos, Alberto Manuel; Cabot, François; Khazaal, Ali; Anterrieu, E.; Barbosa, José; Tenerelli, Joseph; Díez, Raúl; Turiel, Antonio; González Gambau, Verónica (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Accés restringit per política de l'editorial

    • SMOS instrument performance and calibration after 6 years in orbit 

      Martín Neira, Manuel; Oliva, Roger; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Durán Martínez, Israel; Kainulainen, Juha; Closa, Josep; Zurita Campos, Alberto Manuel; Cabot, François; Khazaal, Ali; Anterrieu, E.; Barbosa, José; Tenerelli, Joseph (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés obert
      ESA’s Soil Moisture and Ocean Salinity (SMOS) mission has been in orbit for over 6 years, and its Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) in two dimensions keeps working well. The data for almost this ...

    • SMOS instrument performance and calibration after six years in orbit 

      Martín Neira, Manuel; Oliva, Roger; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Durán Martínez, Israel; Torres Torres, Francisco; Kainulainen, Juha; Closa, Josep; Zurita Campos, Alberto Manuel; Cabot, François; Khazaal, Ali; Anterrieu, E.; Barbosa, José; Tenerelli, Joseph; Turiel, Antonio; Delwart, Steven (2016-07-01)
      Article
      Accés obert
      ESA's Soil Moisture and Ocean Salinity (SMOS) mission, launched 2-Nov-2009, has been in orbit for over 6 years, and its Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) in two dimensions keeps working well. The ...