近廿年来卫星通信技术得到了非常迅速的发展,已经有各种不同的通信卫星相继投入使用。仅从国际通信卫星系列来看,通信容量从一开始(Intelsat-Ⅰ,1965年)的240路电话或一路电视发展到现在(Intelsat-Ⅴ)的12000路电话和2路彩色电视,通信容量有了巨大的增长。但是对日益增长的空间通信需要来说,卫星上可用带宽的限制仍是当 Nearly 20 years of satellite communications technology has been very rapid development, there have been a variety of different communications satellites have been put into use. Only from the International Telecommunications Satellite Series, the capacity of communications has grown from the beginning of 240 (Intelsat-I, 1965) 240 or all the way to 12,000 and 2 color TVs of the present (Intelsat-V) A huge increase. But for the growing space communications need, the restrictions on the available bandwidth on the satellite are still