直接电视广播卫星是在通信卫星的基础上发展起来的,它对卫星技术的要求比通信卫星苛刻得多。如何设计出价廉物美、重量又能低干1,000公斤的直播卫星呢?西德有关部门预先研究了四项先进技术。它们是:统一推进系统,先进的姿态测量和控制系统、轨道控制的离子推进器和超轻重量的太阳电池阵。如果把这四项技术用干西德直播 Direct television broadcasting satellites were developed on the basis of communications satellites, which require much more stringent requirements for satellite technology than communications satellites. How to design cheap, weight and low dry 1,000 kg live satellite? The relevant departments in Germany have studied in advance four advanced technologies. They are: Uniform propulsion systems, advanced attitude measurement and control systems, orbital controlled ion thrusters and ultralight solar arrays. If these four technologies are broadcast live in West Germany