A STUDY ON GLOBAL PREDICTION METHOD FOR SITE DIVERSITY IMPROVEMENT USING THUNDERSTORM RATIO AS A REGIONAL CLIMATIC PARAMETER

摘要

The site diversity system has been proposed as a mitigating technique for the rain attenuation on satellite links using frequencies above about 10 GHz. In this system, signals of two earth stations located apart each other are switched. Although two prediction methods for site diversity improvement are recommended by ITU-R, these methods do not consider regional climatic parameters that will affect diversity improvement. These methods may be further improved in prediction accuracy by considering the regional climatic parameters. Modified versions of the existing prediction methods are proposed in this paper, which are derived by using KIT (Kitami Institute of Technology) satellite link site diversity databank with 108 datasets in 12 countries and thunderstorm ratio as a regional climatic parameter.