SATELLITE BROADCASTING: SLANT PATH ATTENUATION THROUGH RAIN STORMS

摘要

A recently proposed statistical precipitation rate profile for isolated rain storms in the U.K. is employed to obtain the effective attenuation path length or ‘effective dis¬tance' for storms lying directly in the transmission path from a broadcasting satellite operating in the 12 GHz band This effective slant-path distance is a function of the elevation angle and distance from the storm centre. The greatest precipitation rate occurs at the centre of the storm. The attenuation rate (dB/km) corresponding to uniform rainfall at this maximal precipitation rate, when multiplied by the effective distance, yields the excess path attenuation due to the storm. The results represent the greatest attenuation to be expected in 85% of all rain storms.