Enviaments recents

  • Atmospheric-turbulence-induced power-fade statistics for a multiaperture optical reciever 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Rubio, J.A.; Bará Temes, Francisco Javier; Fernández, E. (1997-01)
    Article
    Accés restringit per política de l'editorial
    To estimate the probability distributions of power fades, we consider two basic types of disturbance in electromagnetic wave propagation through atmospheric turbulence: wave-front intensity fluctuations and wave-front ...
  • Impact of antenna errors on the radiometric accuracy of large aperture synthesis radiometers 

    Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Romeu Robert, Jordi (1997-04)
    Article
    Accés restringit per política de l'editorial
    A classification of system errors in aperture synthesis radiometry applied to Earth observation is presented. A general procedure to quantify the impact of antenna errors on the radiometric accuracy is developed and is ...
  • Calibration and experimental results of a two-dimensional interferometric radiometer laboratory prototype 

    Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier (1997-09)
    Article
    Accés restringit per política de l'editorial
    In recent years, Earth observation by means of aperture synthesis radiometry has received special attention by some space agencies as a possible solution to achieve high radiometric accuracy and spatial resolution at low ...
  • Impact of receiver errors on the radiometric resolution of large two-dimensional aperture synthesis radiometers 

    Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi (1997-04)
    Article
    Accés restringit per política de l'editorial
    The specifications of the subsystems that compound a radiometer interferometer devoted to Earth observation are of main concern because they set the viability and final performance of such an instrument. The importance of ...
  • The processing of hexagonally sampled signals with standard rectangular techniques: application to 2d large aperture synthesis interferometric radiometers 

    Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Torres Torres, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 1997-01)
    Article
    Accés obert
    In Earth observation programs there is a need of passive low frequency (L-band) measurements to monitor soil moisture and ocean salinity with high spatial resolution 10-20 km, a radiometric resolution of 1 K and a revisit ...
  • Aerosol optical, microphysical and radiative properties at regional background insular sites in the western Mediterranean 

    Sicard, Michaël; Barragán Cuesta, Rubén; Dulac, F; Alados Arboledas, Lucas; Mallet, Marc (2016-09-28)
    Article
    Accés obert
    In the framework of the ChArMEx (the Chemistry-Aerosol Mediterranean Experiment; http://charmex.lsce.ipsl.fr/) program, the seasonal variability of the aerosol optical, microphysical and radiative properties derived from ...
  • Mode count in planar graded-index waveguides 

    Torner Sabata, Lluís; Canal Bienzobas, Fernando; March, L. de (1988)
    Article
    Accés restringit per política de l'editorial
    The cut-off properties for the TE modes of planar graded-index waveguides have been analysed in terms of the usual normalised waveguide parameters by using the multilayer technique. High accuracy has been achieved. The ...
  • Supermode analysis of the three-waveguide nonlinear directional coupler: the critical power 

    Artigas García, David; Olivas, J; Dios Otín, Víctor Federico; Canal Bienzobas, Fernando (1996-10)
    Article
    Accés restringit per política de l'editorial
    The three-waveguide nonlinear directional coupler switching characteristic is studied using the eigenmodes of the structure (i.e. supermodes). This model, which is more exact than the one used in previous works, has allowed ...
  • Averaging of collected-power fluctuations by a multiaperture receiver system 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Antonio, Juan Rubio (1996-10)
    Article
    Accés restringit per política de l'editorial
    When a large aperture is used to collect light propagated through the atmosphere, it performs an average operation on the irradiance fluctuations, resulting in collected-power fluctuations that are not as large as those ...
  • On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to miras 

    Torres Torres, Francisco; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Ferrero, R Pintor (Institute of Electrical and Electronics Engineers (IEEE), 1996-07)
    Article
    Accés obert
    On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements ...

Mostra'n més