Abstract
The paper presents the recent situation of the research and development on global multimedia mobile satellite communications system using non-geo type satellite constellations. This system is called Next-generation LEO system (NeLS). NeLS research center has carried out the key technology development of the satellite constellation system, which would provide a global mobile satellite service with broadband handheld terminals. The paper presents the development results of key technologies including the digital beam forming (DBF) satellite antenna, optical inter-satellite link system, on-board switching system.
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