Progress in and Prospects of On-Board Communication Equipment Technologies for Communications Satellites in Japan

Communications satellites have been the primary mission from the early period of Japanese space development and their on-board communication equipment are the core devices to realize satellite communications systems. The technologies for this equipment have been developed to meet the requirements of high capacity and high functionality under the severe satellite-imposed constraints. This paper summarizes progress in on-board communication equipment technologies developed and verified by using Engineering Test Satellites and commercial satellites in Japan and describes their prospects. key words: on-board communication equipment, communications satellites, multi-beam satellite communication system, transponder, antenna reflector, on board processor, beam forming

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