Summary
International Symposium on Antennas and Propagation
2012
Session Number:4D2
Session:
Number:4D2-4
Characteristics of Rain Attenuation Time Variation in Ka Band Satellite Communications for the kind of Rain Types in Each Season
Ryuji Nakajo, Yasuyuki Maekawa,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
This study presents detailed attenuation characteristics of the Ka-band satellite signals observed at 1 sec (partly 0.1 sec) interval, at Osaka Electro- Communication University (OECU) in Neyagawa, Osaka from 1997 to 2006. In these periods, rain types of all rainfall events are classified into four kinds of rain types, such as warm, cold, stationary fronts, and typhoon or shower that caused the rain attenuation. The comparison of the fade slope and fade duration characteristics is emphasized according to the difference in these rain types during four seasons of spring, summer, autumn, and winter. As a result, the cumulative probabilities of the duration time become comparatively higher in the typhoon and stationary front events as the duration time increases, while the distribution of the fade slope becomes wider in the cold front events. Also, these observational results for both duration time and fade slope are, as a whole, in good agreement with the ITU-R recommendations. In more detail, however, the distribution of the duration time agrees the best in the cold front events which are common in Europe and North America, although that of the fade slope is slightly wider. As for the duration time, the typhoon and stationary front events which are unique in Japanese monsoon climate seem to give longer duration time than the ITU-R recommendations which primarily depend on European or North American climate. As for the fade slope, to contrast, the typhoon and stationary front events seem to give slower changing rate of attenuation. Thus, these characteristics may help to build more appropriate prediction models of fade duration and slope for Japanese original climate in the future.