摘要：
在处理我国公共安全突发状况和自然灾害时,利用卫星通信系统进行通信十分重要.一个好的卫星通信系统可以安全、快速、经济地完成通信任务,同时可以联动力量、指挥中心、决策支撑系统和现有移动、固定通讯网络构成统一的应急联动指挥系统.传统VPN技术一般应用于企业网在因特网等网络上的延伸,提供高性能、低价位的网络接入,在此基础上对其进行改进优化.通过向中国电信卫星通信公司租用一条数据专线,各终端通过大S卫星联入互联网,各应急平台和应急指挥中心通过VPN网关组成一个完整的应急系统,使用UDP协议与卫星传输数据,并用IPSec协议保护数据安全,构成在大S卫星通信网上的逻辑通信专网,使得各集团、各部门、各用户的卫星通信终端之间组成自主管理的通信专网.由于卫星通信网的独特优势,将使这样的通信专网具有非常好的应急通信鲁棒性.%It is very important to use the satellite communication system to communicate in the process of dealing with public safety emergen-cies and natural disasters.An excellent satellite communication system can complete the communication task safely,quickly and economical-ly.At the same time,it can join forces,command center,decision support system and the existing mobile,fixed communication network to constitute a unified emergency linkage command system.Traditional VPN technology is generally applied to the enterprise network in the In-ternet and other networks on the extension,to provide high-performance,low-cost network access,with its improvement and optimization on the basis.Through the China Telecom Satellite Communications Corporation to rent a data line,each terminal accesses into the Internet through the large S satellite,and the emergency platform and emergency command center form a complete emergency system through the VPN gateway.The use of UDP protocol and satellite for data transmission,and IPSec protocol to protect data security,a logical communica-tion network is constituted on a large S satellite communication network,which makes the satellite communication terminals from the groups or departments or users composed of self-management of the communications network.Due to the unique advantages of the satellite commu-nication network,such a communication network will have unprecedented emergency communication robustness.
