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一、引言本文规定了70年代中,在国际通信卫星4号上对现场试验所用的时分多址系统的要求。为了使不同厂家设计的、采用不同的内部设计方法的终端可以很好地接口,国际通信卫星组织商定了一种共同的技术规范。该系统中涉及的终端应具有这样的机理,即使在过渡时期通信卫星技术发生了巨大变化,这些终端在70年代末至80年代仍然可以使用。因此,这些终端的结构应能满足下面二个主要要求:
I. INTRODUCTION This paper defines the requirements for time-division multiple access systems used in field trials at International Telecommunications Satellite 4 in the 1970s. In order to enable terminals designed by different manufacturers and adopting different internal design methods to interface well, the International Telecommunications Satellite Organization has agreed on a common technical specification. The terminals involved in the system should have mechanisms that will continue to be available from the late 1970s to the 1980s even though there has been a dramatic shift in communications satellite technology during the transitional period. Therefore, the structure of these terminals should meet the following two main requirements: