ONE-YEAR STATISTICS OF ATMOSPHERIC REFRACTIVITY IN THE LOWEST TROPOSPHERE

摘要

Atmospheric refractivity significantly influences the propagation of electromagnetic waves in atmosphere. ITU-R recommends using statistics of a refractivity vertical gradient in the lowest 65 meters above ground level for the estimation of the multipath fading incidence on the terrestrial fixed wireless links. In this paper, the results of the measurement of atmospheric refractivity in the lowest 123 m layer of the atmosphere are presented. The daily and monthly variability of refractivity and of its vertical gradient is shown. Refractivity gradient statistics are compared with the quantiles obtained from the ITU-R world map.