一、引言卫星通信的进展是很惊人的。虽然从卫星通信开始实验算起至今仅十年时间,但现在它已承担着国际通信的主要部分。而且,这类系统仍然在以惊人的速度发展着。在日本,卫星通信技术作为这个时代最重要的计划之一而受到欢迎。为了加速这个计划,1961年四个与此有关的组织组成了一个委员会。在1963年和1964年分别于茨城 I. INTRODUCTION The progress of satellite communications is amazing. Although only ten years have passed since the satellite communications began, it has now assumed a major part of international communications. Moreover, such systems are still developing at an alarming rate. In Japan, satellite communications technology was welcomed as one of the most important programs of this era. In order to speed up the plan, in 1961 four related organizations formed a committee. In 1963 and 1964 respectively in Ibaraki