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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Earth-space path propagation characteristics in the climatic conditions of the Czech Republic from Alphasat Ka/Q band experiment
 Fišer, Ondřej ; Brázda, Vladimír ; Pešice, Petr ; Grabner, M.
The objective of the activity is to prepare, realize and conduct experimental research of the influence of atmospheric phenomena on the Earth-space path propagation characteristics at 20 and 40 GHz (Ka/Q) bands in the specific climatic conditions of the Czech Republic (CR). The scientific approach is based on the comprehensive measurements of physical parameters of atmosphere together with concurrent measurements of propagation characteristics on the Earth-space path and on 10 collocated terrestrial paths with star configuration. The proposed activity will utilize the ESA Alphasat Mission Ka/Q experiment that is designed to investigate the propagation characteristics on slant paths in Europe and elsewhere.
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Výsledky dvouletého výzkumu útlumu způsobeného hydrometeory na trase 93 GHz a v optickém pásmu 850 nm
 Kvičera, V. ; Grábner, M. ; Fišer, Ondřej
The results of 2 years of experimental research of attenuation due to hydrometeors at 94 GHz with V polarization on an 850 m path are presented. Both the cumulative distributions of attenuation due to all the hydrometeors together and the cumulative distributions of attenuation due to the individual hydrometeors are given. The results are compared with the relevant ITU-R recommendations.
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First results of experimental investigation in frequency band 58 GHz
 Kvičera, V. ; Grábner, M. ; Fišer, Ondřej
TESTCOM and Institute of Atmospheric Physics, ASCR launched a common experimental research in the frequency band 58 GHz on the experimental hop Geophysical Institute, ASCR - TESTCOM in the frequency band 58 GHz since December 2000. Our research has been focused on obtaining knowledge concerning attenuation due to hydrometeors in our specific climatic conditions. The path length is 846 m, used frequency is 57 650 MHz with V polarization. Records of received signal were statistical processed and cumulative distributions of attenuation due to hydrometeors for individual month as well as the first year period of observation from December 2000 to November 2001 were obtained. The records of attenuation were compared with the concurrent meteorological situation and attenuation due to rain, snow, fog, rain with snow and rain with hail were separatd. Rain intensities have been measured at both sites of path. Obtained CDs of rain intensities are presented.
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