Exploració per autor "Ghavidel, Ali"

Ara es mostren els items 1-8 de 8

    • A numerical simulator to evaluate the electromagnetic bias in GNSS-R altimetry 

      Ghavidel, Ali; Schiavulli, Domenico; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper presents the computed electromagnetic (EM) bias predicted for GNSS-R altimetry systems. First, a synthetic time-evolving sea surface is generated satisfying an ocean surface height spectrum. Then, a direct GNSS ...

    • A simulator for GNSS-R polarimetric observations over the ocean 

      Schiavulli, Domenico; Ghavidel, Ali; Camps Carmona, Adriano José; Migliaccio, Muriccio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Global Navigation Satellite Systems - Reflec-tometry (GNSS-R) represents an innovative tool for remote sensing. In this paper a facet-based simulator is presented to investigate the polarimetric characteristics of GNSS ...

    • Contributions to the determination of electromagnetic bias in Gnss-R altimetry 

      Ghavidel, Ali (Universitat Politècnica de Catalunya, 2015-07-14)
      Tesi
      Accés obert
      In this Ph. D. dissertation the electromagnetic bias in GNSS-R (Global Navigation Satellite Systems Reflectometry) altimetry has been studied. GNSS-R altimetry is a new type of system that uses navigation signals as signals ...

    • GEROS-ISS, a demonstration mission of GNSS remote sensing capabilities to derive geophysical parameters of the earth surfaces: performance evaluation 

      Camps Carmona, Adriano José; Hyuk, Park; Ghavidel, Ali; Rius Casals, Juan Manuel; Sekulic, Ivan (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The GNSS rEflectometry, Radio Occultation and Scatterometry onboard International Space Station (GEROS-ISS) is an innovative experiment for climate research, proposed in 2011 within a call of the European Space Agency (ESA) ...

    • GNSS-R wind-dependent polarimetric signature over the ocean 

      Schiavulli, Domenico; Ghavidel, Ali; Camps Carmona, Adriano José; Migliaccio, Muriccio (2015-12-01)
      Article
      Accés restringit per política de l'editorial
      Global Navigation Satellite System-Reflectometry (GNSS-R) is a promising and innovative remote sensing technique. In this letter, an investigation on the polarimetric characteristics of GNSS-R signals is performed. The ...

    • Impact of rain, swell, and surface currents on the electromagnetic bias in GNSS-Reflectometry 

      Ghavidel, Ali; Camps Carmona, Adriano José (2016-10-01)
      Article
      Accés obert
      The assessment of the electromagnetic (EM) bias is required to predict the performance of upcoming global navigation satellite systems-reflectometry (GNSS-R) altimetry systems, and its impact in data assimilation climate ...

    • Numerical computation of the electromagnetic bias in GNSS-R altimetry 

      Ghavidel, Ali; Schiavulli, Domenico; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2016-01-01)
      Article
      Accés obert
      In radar altimetry, the electromagnetic (EM) bias is originated by the smaller reflectivity of wave crests than troughs; thus, the average sea surface height is underestimated. Bias uncertainty is currently the largest ...

    • Time-domain statistics of the electromagnetic bias in GNSS-reflectometry 

      Ghavidel, Ali; Camps Carmona, Adriano José (2015-09-01)
      Article
      Accés obert
      Global Navigation Satellite Systems-Reflectometry (GNSS-R) is an emerging remote sensing technique that uses navigation signals reflected on the Earth's surface as sources of opportunity for scatterometry and altimetry. ...