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日本计划利用1992年发射的技术试验卫星6号(ETS～Ⅵ)进行一系列卫星通信新技术实验。其中最重要的是多波束卫星通信技术。这种技术主要是利用大型星上天线形成窄波束,从而增加地球站信号功率通量密度,这样不仅可以增加传输容量,而且可使地球站小型化从而产生更好的经济效果。其主要新技术包括:大型高精度的可展开天线、精确的天线指向系统、星上切换开关、轻重量转发器和管理控制系统等。这些技术对固定和移动卫星通信都十分重要。一、技术概况 1.技术要求日本用于固定式和移动式的多波束卫星通信实验主要想达到两个目的:(1)验证
Japan plans to conduct a series of new satellite communications experiments using the 1992 Technical Emission Satellite 6 (ETS-VI). The most important of these is multi-beam satellite communication technology. This technology is mainly the use of large satellite antennas to form a narrow beam, thereby increasing the signal power of earth station flux density, which will not only increase the transmission capacity, but also make the earth station miniaturized to produce better economic results. Its main new technologies include: large-scale high-precision deployable antenna, accurate antenna pointing system, on-satellite switch, light weight transponder and management control system. These technologies are important for both fixed and mobile satellite communications. First, the technical overview 1. Technical Requirements Japan for fixed and mobile multi-beam satellite communications experiments mainly want to achieve two objectives: (1) verification