Ara es mostren els items 1-11 de 11

  • Assessment on linearity errors in detectors for interferometric radiometers 

    Torres Torres, Francisco; Duffo Ubeda, Núria; Gonzalez-Haro, Cristina; Vilaseca, R; Sagués, L; Martín-Neira, Manuel (2008)
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    The performance of the power detectors used to denormalize the digital correlations in interferometric radiometers is degraded due to the non-linear behavior of the diode response. This work presents a comprehensive ...
  • Calibration consistency tool for interferometric radiometers 

    González-Gambau, Verónica; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (2008)
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    This paper presents a method to check the consistency of the amplitude calibration in interferometric radiometers devoted to Earth observation This tool is based in the intrinsic properties of the internal calibration ...
  • Correction of spatial errors in SMOS brightness temperature images 

    Wu, Lin; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (IEEE, 2011)
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    Systematic spatial errors in SMOS brightness temperature images are successfully estimated by using a statistical analysis of measured data. A constant multiplicative mask is derived by averaging spatial errors of a large ...
  • 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)
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    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 ...
  • Interferometric radiometry measurement concept: The visibility equation 

    Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (IEEE, 2011)
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    The fundamental concept of interferometric aperture synthesis microwave radiometry for Earth observation is reviewed. The measurement principles and a discussion on the signal processing techniques for image reconstruction ...
  • MIRAS characterization and monitoring during the SMOS In-Orbit Commissioning Phase 

    Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Martín-Neira, Manuel; Duffo Ubeda, Núria; González-Gambau, Verónica; Camps Carmona, Adriano José; Vall-Llossera Ferran, Mercedes Magdalena (2009)
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  • Phase error assessment of MIRAS/SMOS by means of the redundant space calibration 

    Dávila, Rubén; Torres Torres, Francisco; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi; Pablos, Miriam; Martín-Neira, Manuel (IEEE, 2011)
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    SMOS is the acronym for the Soil Moisture and Ocean Salinity mission by the European Space Agency (ESA) [1]. Its single payload, the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS), was successfully launched ...
  • Significant wave height retrieval based on the effective number of incoherent averages 

    Martín Alemany, Francisco; Camps Carmona, Adriano José; Martín-Neira, Manuel; d'Addio, Salvatore; Fabra, Fran; Rius Jordán, Antonio; Hyuk, Park (2015)
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    The effectiveness of incoherent averaging depends on the level of correlation between consecutive waveforms, which can vary with the geometry and with the sea state conditions. In addition it is also dependent on the ...
  • SMOS brightness temperature measurements and end-to-end calibration 

    Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Martín-Neira, Manuel (IEEE, 2011)
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    SMOS is the acronym for the Soil Moisture and Ocean Salinity mission by the European Space Agency (ESA) [1]. Its single payload, the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS), was launched in November ...
  • SMOS payload in-orbit performance 

    Martín-Neira, Manuel; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; González-Gambau, Verónica; Closa, Josep; Benito, Javier; Borges, A.; Rautiainen, K.; Kainulainen, J.; Gutierrez, A.; Barbosa, J.; Catarino, N.; Castro, R.; Freitas, S.; Candeias, H.; Freitas, J.; Cabot, F.; Anterrieu, E.; Zundo, M.; Brown, M.; McMullan, K.; Martín-Porqueras, F.; Oliva, R.; Wright, N.; Caprolicchio, R. (2010)
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  • SMOS payload pre-launch performance 

    Martín-Neira, Manuel; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; González-Gambau, Verónica; Colliander, A; Closa, Josep; Benito, J; Borges, A; Brown, M; McMullan, K (2009)
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