ONE-YEAR STATISTICS OF ATMOSPHERIC REFRACTIVITY IN THE LOWEST TROPOSPHERE

摘要

Atmospheric refractivity significantly influences thernpropagation of electromagnetic waves in atmosphere.rnITU-R recommends using statistics of a refractivityrnvertical gradient in the lowest 65 meters above groundrnlevel for the estimation of the multipath fading incidencernon the terrestrial fixed wireless links. In this paper, thernresults of the measurement of atmospheric refractivity inrnthe lowest 123 m layer of the atmosphere are presented.rnThe daily and monthly variability of refractivity and of itsrnvertical gradient is shown. Refractivity gradient statisticsrnare compared with the quantiles obtained from the ITU-Rrnworld map.