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绪言六十年代后半期,是通信卫星在国际通信中获得惊人发展的时期,那时关于广播卫星的系统研究也逐渐地增加了,可是没有一个方案能够实现,因此实现卫星广播看来似乎是相当
INTRODUCTION The second half of the sixties was a period of phenomenal growth for communications satellites in international communications when the systematic study of broadcast satellites had also gradually increased but none had been realized and satellite broadcasting therefore appeared to be comparable