Rain attenuation characteristics in Ku and Ka band satellite communications related to the kinds of rain fronts

摘要

Rain attenuation ratio of Ka- to Ku-band satellite signals is investigated related to the kinds of rain fronts, using BS (11.84 GHz) and N-Star (19.45 GHz) signals, which have been received at the earth station in our university (Neyagawa, Osaka) for the past 13 years. A comparatively large attenuation ratio was primarily found, when the cold fronts passed over the earth station in Baiu season. In contrast, a comparatively small ratio was primarily obtained, when the earth station was located to the south of the stationary fronts in Akisame season. A small ratio was also found in summertime shower. This difference seems to be caused by a dominant kind of raindrop size distribution in each season.