前言利用同步轨道的卫星来实现全球性、区域性、尤其是国内的电视广播业务,具有“复盖”区域广、建设周期短的优点。特别是在那些沙漠地区,或崇山峻岭,交通不便,人口稀少的地区,地面微波通信线路很难建设,这就更是一种最有效的解决途径。目前,若干工业 Preface The use of geostationary orbit satellites to achieve global, regional, especially domestic television broadcasting services, with “cover ” wide area, the advantages of short construction period. Especially in those desert areas, or mountains, traffic inconvenience, sparsely populated areas, ground microwave communication lines is very difficult to build, which is even more the most effective solution. At present, a number of industries