Exploració per autor "Bará Temes, Francisco Javier"Més informació

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    • 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)
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      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)
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      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)
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      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)
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      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)
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      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)
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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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      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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