Developmental Research for Academic Network with Domestic Communication Satellite CS-2

本研究的目的是发展小型地面站的学术卫星网络，作为未来学术信息网络的原型，并建立面向大型网络的通信软件开发系统。本文的研究项目和得到的结果如下：1。分布式控制协议卫星网络作为学术信息网络的发展。(1)与区域局域网的连接可以看出，基于预留的区域局域网接入方式具有良好的消息传输特性。研究了适用于该网络的流量控制系统。为拥有大量小地面站的网络制订了新的广播通信协议，并通过CS-2试验进行了测试。实验结果表明，该方法是非常有效的。分布式协议卫星网应用于广域网（JUNET）。有效连接方法是新发展起来的。采用新方法进行的消息传输实验表明，该方法具有良好的性能。本系统具有良好的可移植性，因此很容易开发到其他系统。通信软件自动生成系统的开发本文讨论的通信系统规模较大，功能复杂。因此，开发一个功能强大的通信软件开发系统显得尤为重要。本文研究了智能通信软件生成系统的设计方法。即(1)设计了描述语言、高级语言、编辑器和算法转换等基本功能；(2)设计了友好的用户界面；(3)利用这些成果，开发了功能强大的新型通信软件创建系统。

The aim of this study is to develope the academic satellite network with small-size earth stations as the prototype of the future academic infomation Networks and is to establish the communication software creating system for the large scale network. The research items and the results obtained here are as follows.1. Development of the distributed-control-protocol satellite network as the academic information network. (i)Connection with the teristrial LAN It becomes clear that the access method of LAN based on reservation shows the good message transmission characteristic. Flow-control system fitted for this network was investigated. (ii)New protocol of the broadcasting communication for the network with a large number of small earth stations is developed and tested with CS-2 experiments. Experimental resulsts show that this method is quite powerful. (iii)The distributed protocol satellite network is applied to the wide area network, JUNET. The effective connection method is newly developed. The message transmission experiment by using new method shows quite good characteristics. This system is designed to have good portability, so it is quite easy to develope to another system.2. Development of the communication software automatic-creating system Communication system discussed here is quite large and its function is quite complicated. So it is very important to make the powerful communication software creatring system. Here the design method of the intelligent communication software creating system is investigated. Namely (i)we designed the specification describing language, high level language, editor and algorithm conversion as the basic functions of the system and (ii)also designed the user friendly interface and then (iii) by using these results, we developed the new powerful communiation software creating system.