Propagation studies for feeder link design, volume 2

A general description, both phenomenological and statistical, of propagation impairments in the 10 to 30 GHz range is given. The principal effects are attenuation due to rain and cross polarization due to both rain and ice particles; the discussion aims to provide a physical understanding of general principles. Statistics of their occurrence are also given for much of Europe. The problem of power control of feeder links is considered. The object is to boost the feeder line power during rain fading to maintain a nearly constant flux at the satellite. The method discussed is an open loop, forward correction scheme in which the Earth station will observe the rain fading on a 12 GHz satellite down link beacon (or possibly the TV signal itself) and will frequency scale the attenuation to 18 GHz to determine the degree of boosting of the feeder link power.