Now showing items 1-14 of 14

    • 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • GEROS-ISS: GNSS REflectometry, radio occultation, and scatterometry onboard the International Space Station 

      Wickert, Jens; Cardellach, Estel; Martín-Neira, Manuel; Bandeiras, J.; Bertino, Laurent; Baltazar Andersen, Ole; Camps Carmona, Adriano José; Catarino, Nuno; Chapron, Bertrand; Fabra, Francisco; Floury, Nicolas; Foti, Giuseppe; Gommenginger, Christine; Hatton, Jason; Høeg, Peter; Jaggi, A.; Lee, T.; Li, Z.; Hyuk, Park; Pierdicca, Nazzareno; Ressler, Gerhard; Rius, Antonio; Font-Rosselló, Josep; Saynisch, Jan; Soulat, François; Shum, C. K.; Semmling, Maximilian; Sousa, Anna; Xie, Jiping; Zuffada, Cinzia (2016-10-01)
      Article
      Open Access
      GEROS-ISS stands for GNSS REflectometry, radio occultation, and scatterometry onboard the International Space Station (ISS). It is a scientific experiment, successfully proposed to the European Space Agency in 2011. The ...
    • Impact of antenna tuning on SMOS correlation loss 

      Torres Torres, Francisco; Durán Martínez, Israel; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Closa, Josep; Oliva, Roger; Martín-Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Restricted access - publisher's policy
      The Soil Moisture and Ocean Salinity (SMOS) mission by the European Space Agency (ESA) was launched in 2009 [1]. Since then, it has produced a continuous stream of valuable geophysical data over land, ice and ocean [2] ...
    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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 ...
    • Innovative sea surface monitoring with GNSS-REflectometry aboard ISS: overview and recent results from GEROS-ISS 

      Wickert, Jens; Baltazar Andersen, Ole; Bandeiras, J.; Bertino, Laurent; Cardellach, Estel; Camps Carmona, Adriano José; Catarino, Nuno; Chapron, Bertrand; Foti, Giuseppe; Gommenginger, Christine; Hatton, Jason; Høeg, Peter; Jaggi, A.; Kern, Michael; Lee, T.; Martín-Neira, Manuel; Hyuk, Park; Pierdicca, Nazzareno; Font-Rosselló, Josep; Semmling, Maximilian; Shum, C.K.; Zuffada, Cinzia; Soulat, François; Sousa, Anna; Xi, J. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Open Access
      GEROS-ISS (GEROS hereafter) stands for GNSS REflectometry, Radio Occultation and Scatterometry onboard the International Space Station. It is a scientific experiment, proposed to the European Space Agency (ESA) in 2011 for ...
    • Interferometric radiometry measurement concept: The visibility equation 

      Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín-Neira, Manuel (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
    • 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference lecture
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
    • 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)
      Conference report
      Restricted access - publisher's policy