EHF Attenuation Assessment Based on Worst-Month 1-Minute Rain Data.

摘要

A new data base of 1-minute rain rates for a 10-year period at each of 41 United States locations was extracted from original weighing raingage recordings. Rates for a 6 1/2-year period were also extracted for a Puerto Rican station. The locations were chosen to represent a variety of rain climates. The data base was used to estimate rain attenuation outages on a monthly basis. Previous attenuation studies have almost exclusively used annual rain statistics. However, these can be very misleading because rain attenuation outages are concentrated in only a few months of the year at most locations. Analyses of worst-month outages, including durations, at frequencies of 15-, 30- and 45 GHz and propagation path elevation angles of 10 degrees, 30 degrees, 50 degrees and 70 degrees are presented. Seasonal differences and time periods between outages are also discussed. Keywords: Rain; Rainfall rate; Precipitation; Extremely high frequencies; Communications; Satellite communications. (R.H.)