Now showing items 1-11 of 11

  • BER and Availability Measured on FSO Link 

    Kvicala, R.; Kvicera, V.; Grabner, M.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2007-09)
    The BER and the availability belong among the basic qualitative parameters of free space optical (FSO) links. The BER parameter is usually mentioned by FSO manufacturers, but it is not defined what conditions a certain ...
  • Diurnal and Seasonal Variations of Water Vapour and Cloud Water Attenuation in Microwave Frequency Bands 

    Fiser, O.; Rezacova, D. (Společnost pro radioelektronické inženýrství, 1997-09)
    20 years of radiosonde data from the aerological station Prague-Libus were analysed to evaluate integrated values of water vapour content and cloud water content. Both parameters are proportional to the attenuation in ...
  • Modeling of 830 nm FSO Link Attenuation in Fog or Wind Turbulence 

    Pesek, J.; Fiser, O.; Svoboda, J.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2010-06)
    This study is focused on the experimental research of the atmosphere impact on FSO link attenuation. Experiment is performed on a mountain observatory Milesovka of severe weather conditions. The empirical relationships on ...
  • Multipath Propagation of UWB Through-Wall Radar and EMC Phenomena 

    Schejbal, V.; Cermak, D.; Nemec, Z.; Pidanic, J.; Konecny, J.; Bezousek, P.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2006-12)
    The UWB (ultra wide band) radar output signals can be substantially affected due to electromagnetic wave propagation through obstacles (such as walls) and multipath effects, too. Multipath effects are analyzed and simulated ...
  • Prediction of Rain and Water Vapour Attenuation at Frequencies 10-30 GHz 

    Fiser, O. (Společnost pro radioelektronické inženýrství, 1996-09)
    This contribution discusses the attenuation of microwaves in the atmosphere and applies the results to the conditions in the Czech Republic. The simple CCIR method predicting the rain attenuation is described and the ...
  • Propagation Characteristics and Availability Performance Assessment for Simulated Terrestrial Hybrid 850 nm/58 GHz System 

    Kvicera, V.; Grabner, M.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2010-06)
    Results of a propagation study on a free space optical link at 850 nm on a path 853 meters long and on a parallel 58 GHz radio link obtained over a 3-year period of observation are presented. The cumulative distributions ...
  • A Simple Generator of Forward Scattering Functions on Spherical Dielectrics 

    Fiser, O. (Společnost pro radioelektronické inženýrství, 1993-04)
    The described program generates the forward scattering functions of dielectrics of spherical shape, while the input parameters are: frequency, radius of the sphere and complex refractive index. The part enabling to evaluate ...
  • Site Diversity Gain Estimated from Rain Rate Records 

    Fiser, O. (Společnost pro radioelektronické inženýrství, 2003-04)
    The site diversity is used to mitigate the rain attenuation on satellite links. The attenuation is estimated through the rain rate-rain attenuation conversion based on the Assis-Einloft physical model in this study. Through ...
  • Statistics of Radio Refractivity Derived from Prague Radiosounding Data 

    Rezacova, D.; Fiser, O.; Ramon Saez, L. (Společnost pro radioelektronické inženýrství, 2003-12)
    Vertical gradient of radio refractivity in the lowest 100 m is derived from the meteorological radio-sounding data of the Prague-Libus station. The data cover the measurements at the terms 00, 06, 12, and 18UTC, and the ...
  • Two-Dimensional Forward Scattering – Comparisons of Approximate and Exact Solutions 

    Schejbal, V.; Svoboda, P.; Pidanic, J.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2012-04)
    Various methods for analyses of scattering are mentioned and new approximate relationships are derived. Experimental results for thin wire and several numerical simulations of forward scattering using approximate estimations, ...
  • UWB Propagation through Walls 

    Schejbal, V.; Bezousek, P.; Cermak, D.; Nemec, Z.; Fiser, O.; Hajek, M. (Společnost pro radioelektronické inženýrství, 2006-04)
    The propagation of ultra wide band (UWB) signals through walls is analyzed. For this propagation studies, it is necessary to consider not only propagation at a single frequency but in the whole band. The UWB radar output ...