Estimation of attenuation by rain on terrestrial radio links in the UK at frequencies from 10 tp 100GHz

Methods are given for estimating attenuation caused by rain during the average year, worst year and worst month of a 20-year period and during the worst month of the average year of that period. Probability distributions of point rain rates are modified by temporal and spatial factors derived from long-term and short-term rainfall records to obtain probability distributions of line rates RL, over paths up to 60 km long. Attenuation A is calculated from A = ¿R¿L, where ¿ and ¿ are parameters dependent on polarisation and frequency. Estimated values are compared with experimental observations at frequencies near 11, 20, 36, 60 and 110 GHz.