Ara es mostren els items 57-76 de 76

    • Radiometric sensitivity computation in aperture synthesis interferometric radiometry 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Torres Torres, Francisco (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-03-01)
      Article
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      This paper is concerned with the radiometric sensitivity computation of an aperture synthesis interferometric radiometer devoted to Earth observation. The impact of system parameters and the use of simultaneous redundant ...
    • Radiometric Sensitivity Computation in Aperture Synthesis Interferometric Radiometry 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Torres Torres, Francisco (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-03-31)
      Article
      Accés obert
      This paper is concerned with the radiometric sensitivity computation of an aperture synthesis interferometric radiometer devoted to Earth observation. The impact of system parameters and the use of simultaneous redundant ...
    • Radiometric sensitivity computation in aperture synthesis interferometric radiometry 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Torres Torres, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 1998-03)
      Article
      Accés obert
      This paper is concerned with the radiometric sensitivity computation of an aperture synthesis interferometric radiometer devoted to Earth observation. The impact of system parameters and the use of simultaneous redundant ...
    • Receiver specifications of the MIRAS demonstrator 

      Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Borges, A. (SPIE The International Society for Optical Engineering, 2000)
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      Improved weather forecast and climate monitoring rely on a better quantification of soil moisture (SM) and sea surface salinity (SSS). The most accurate way to measure them from remote sensors is by using radiometers at L ...
    • Reliability analysis in aperture synthesis interferometric radiometers: application to L-Band microwave imaging radiometer with aperture synthesis instruments 

      Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Bará Temes, Francisco Javier (AMER GEOPHYSICAL UNION, 2001-03-31)
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      Accés obert
      The Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) instrument will be the first radiometer using aperture synthesis techniques for Earth observation. It will be boarded in the Soil Moisture and Ocean Salinity ...
    • 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)
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      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 ...
    • RF interference analisys in aperture synthesis interferometric radiometers: Application to L-band MIRAS instrument 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Bará Temes, Francisco Javier; Capdevila Vives, Joan (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-03-31)
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      Accés obert
      Current spaceborne radiometers do not achieve the required spatial resolution demanded by the scientific community due to antenna-size technological limitations. In recent years, several space agencies have been studying ...
    • Scattering and emissivity of rain events using boundary element method 

      Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Torres Torres, Francisco (2000)
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      The theory of thermal microwave emission from a bounded medium containing random nonspherical discrete scatters is studied. It is known that for a medium of constant temperature the emissivities can be related to the ...
    • Temperature compensation of resonant cavities with a teflon post 

      Bará Temes, Francisco Javier (Universidad de Cantabria, 1982)
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      The negative temperature coefficient of E for teflon is used to compensate the frequency drift of a metal cavity due to thermal expansion. An experimental X-band transmission resonator was compensated in this way with a ...
    • The correlation of visibility errors and its impact on the radiometric resolution of an aperture synthesis radiometer 

      Bará Temes, Francisco Javier; Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-09-30)
      Article
      Accés obert
      The correlation between the visibility samples' noise of an aperture synthesis radiometer are required for the computation of the recovered temperature noise of a given pixel and of the improvement introduced by baseline ...
    • The correlation of visibility noise and its impact on the radiometric resolution of an aperture synthesis radiometer 

      Bará Temes, Francisco Javier; Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi (Institute of Electrical and Electronics Engineers (IEEE), 2000-09)
      Article
      Accés obert
      The correlation between the visibility samples' noise of an aperture synthesis radiometer are required for the computation of the recovered temperature noise of a given pixel and of the improvement introduced by baseline ...
    • 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 ...
    • 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 (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-01-31)
      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 ...
    • The specification of channel filters for an interferometric radiometer 

      Bará Temes, Francisco Javier; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Torres Torres, Francisco (2001-02)
      Article
      Accés obert
      Differences among the channels that form an interferometric radiometer result in amplitude and phase errors in the cross correlations measured from the signals collected by each pair of antennas (visibility samples). Since ...
    • The WISE 2000 campaign: sea surface salinity and wind retrievals from L-band radiometry 

      Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Font Ferré, Jordi; Etcheto, Jacqueline; Duffo Ubeda, Núria; Vall-Llossera Ferran, Mercedes Magdalena; Bará Temes, Francisco Javier; Torres Torres, Francisco; Wursteisen, Patrick; Martín Neira, Manuel (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2000)
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      Sea surface salinity (SSS) has been recognized as a key parameter in climatological studies. SSS can be measured by passive microwave remote sensing at L band, where the sensitivity of the brightness temperatures shows a ...
    • Theoretical research on new concepts for the remote sensing of hydrometeors 

      Martín Neira, Manuel; Bará Temes, Francisco Javier; Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Gasparini, O; Arbulino, M V (1996)
      Text en actes de congrés
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      There is an interest for climatology and meteorology to map hydrometeors, and in particular precipitation, both over the entire globe and across large defined regions. To achieve this goal at the proper spatial and temporal ...
    • Threshold and timing errors of 1 bit / 2 level digital correlators in earth observation synthetic aperture radiometry 

      Camps Carmona, Adriano José; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Lluch, J. A. (IEE-INST ELEC ENG, 1997-04-30)
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      Accés obert
      Analytical expressions for the errors generated in 1 bit/2-level digital correlators (IB/2L) are derived: threshold errors in comparators and timing (skew and jitter) errors in samplers. These expressions are used to specify ...
    • TRL calibration applied to the measurement of chip transistor s-parameters up to 40 ghz 

      Pradell i Cara, Lluís; Sabater, C.; Artal, Eduardo; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Fortuny, J. (Institute of Electrical and Electronics Engineers (IEEE), 1990)
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    • Unidad externa para una estación terrena del experimento CODE 

      Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Pradell i Cara, Lluís; Fortuny Guasch, Joaquim (1991)
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      In this paper, the design of an outdoor unit for aCODE earth station is presented. CODE is a communications experiment that uses satellite Olympus to link several user stations vi a a hub station in a star configuration . ...
    • Visibility inversion algorithms over hexagonal sampling grids 

      Camps Carmona, Adriano José; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Torres Torres, Francisco (European Spatial Agengy (ESA), 1995)
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