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Rain Attenuation Characteristics for 21-GHz-band Satellite Broadcasting Measured by Beacon Signal

The BSAT-4a broadcasting satellite was launched in September 2017. BSAT-4a has 12-GHz-band transponders for HDTV and UHDTV broadcasting services, as well as 21-GHz-band transponders for experiments aimed at next-generation broadcasting services. In the 21-GHz-band transponders, a beacon signal is available for observing rain attenuation and cross polarization discrimination (XPD) characteristics. We have started making measurements at a receiving earth station in Tokyo. We compared the measured rain attenuation and XPD characteristics in the 21-GHz band with the predicted characteristics specified in Rec. ITU-R P.618-13.