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一、引言我国幅员辽阔,地形复杂,人口众多且分布极不均匀,要提高广播电视的人口覆盖率,靠增加地面电视发射台、差转台及微波站的数量是不够的。而卫星电视广播是实现这个任务的最先进、最有效的技术手段,它以覆盖面积大、传送质量高、投资
I. INTRODUCTION Because of its vast territory, complicated terrain, large population and extremely uneven distribution, it is not enough to increase the population coverage of radio and television by increasing the number of terrestrial television transmitting stations, differential transmitting stations and microwave stations. The satellite television broadcasting is the most advanced and effective technical means to achieve this task. It covers a large area, high transmission quality, investment