《卫星通信在因特网中的应用》由会员分享，可在线阅读，更多相关《卫星通信在因特网中的应用（2页珍藏版）》请在金锄头文库上搜索。
1、卫星通信在因特网中的应用Application of Satellite communication to Internet与地面通信系统相比Comparing with Ground communication system , 卫星通信Although sometimes Satellite communication system has Extension of times系统虽然有延时较长Double to deliver expenses higher双向传输费用较高等缺点, 但具有其它通信手段无可替代的优点: But have other communication withou
2、t the advantage that can act for,覆盖面广The coverage is wide; 传输速率较高The baud rate is higher, 具有极佳的广播性能Have the best broadcasting function; 传输不受地理条件的限制Deliver to be free from geography conditional restriction, 费用与距离无关; The expenses has nothing to do with the distance,组网灵活Set the net is vivid, 网络建设速度快The
3、 network constructs speed quick and so on等。因此作为地面网络的补充Consequently as a ground network to add, 卫星通信对于地面网络不能到达的地区和不发达地区( 如我国的边远地区、西部地区) 来说是一种有效的通信方式, 可以将因特网延伸到更广阔的范围。Satellite communication says to is a kind of effective correspondence method for region that the ground network can not arrive and not
4、flourishing region( if our country of side far area, western region) can extend Internet to vaster scope.另外作为通信网络骨干网的通信方式, 卫星通信可以绕开地面电路的“ 瓶颈”, 使公司或住宅用户直接访问因特网。Moreover as the communication method that communication the most important network in the network, the satellite correspondence can round “bo
5、ttleneck“ of the ground electric circuit and make company or residence the customer directly visit Internet.根据各国对卫星带宽需求的分析, 因特网对于卫星带宽的要求处于不断增长中。According to all countries to satellite bandwidth demanding analysis, the Internets request toward satellite bandwidth is placed in to continuously increase
6、 in.经过几年的研究After several years of research我们提出了一个新的专用于卫星信道的传输协议TP_S, Our bring forward a new appropriative transport protocols called TP_S for the satellite channel 该协议已经申请了国家发明专利the protocol is already applied for a nation invention patent。TP_S 协议是一个专用于卫星信道, 针对卫星信道的特点进行了特别优化的传输协议。The TP_S protocol
7、is an appropriation for the satellite channel ,the characteristics aiming at satellite channel carried on specially excellent turn of transport protocols 和TCP 一样Similar to TCP, TP_S 协议是一个可靠的为IP 网络设计的数据流传输协议, TP_S is a dependable data stream transport protocols for IP network designs 发送端发送长度不定的数据给接收端
8、Sender sends out the data of length not certain to receiver.然后存储已发送的数据Then save have been already sent out of data, 直到接收端告知数据已被接收时才释放Until receiver tell a data just release while having already been received, 否则重发Otherwise re- send out。但是TP_S 协议的ARQ 机制使用被动应答, 而不是TCP 使用的主动应答But the ARQ mechanism of T
9、P_S protocol use of passive answer, not TCP use of should answer on ones own initiative。发送的数据帧被依次编号Data frame of sending out drive one by one in order serial number, 发送端只重发接收端明确要求的数据帧,Sender only re-send out the data frame of receivers explicit request 和TCP 不同的是它不使用超时机制来启动重发。Different from TCP is it
10、 doesnt use overtime mechanism to start to re- send out随着因特网的发展, with the development of Internet 网络用户人数和他们所需要的服务都在飞速地增长Network customer number and service that they need all at fly soon increase。人们不再满足于语音和低速的数据业务People no longer satisfied with voice and data serve of low speed,他们希望在任何时间、任何地点都能获取高速的
11、多媒体信息They hope that the multi-media information being high-speed canning obtain at any one time and anywhere。为了满足这些要求For satisfying these requests, 目前已经或将要开始建设的下一代卫星宽带多媒体网络采取了全新的方案, Currently already or will the next generation satellite breadth of multi-media network start constructing with adopt a
12、n all new project 主要特点是使用IP 或IP/ ATM 模式传输多媒体信息, The main characteristics is to use IP or IP| the ATM mode deliver a multi-media information 另外普遍采用了Ka 波段来提供更多的带宽otherwise and widespreadly adopted Ka wave band to provide more bandwidths随着因特网的发展和用户对宽带多媒体业务需求的不断增长, with the development of Internet and t
13、he customer continuously increasing of the need about Broad Band multi-media serve 卫星通信系统传输的业务由传统的语音和低速数据转向了视频流和高速数据transfers service of Satellite communication system change form the traditional voice and the low speed data to video flow and high-speed data 对带宽的迫切需求要求发射更多的卫星Request to shoot more sa
14、tellites to the urgent need of bandwidth, 每个卫星携带更多的转发器Each satellite takes to morely forward a machine。对TCP/ IP 协议的改进和下一代卫星宽带多媒体网络的推出将满足用户在任何地方、任何时间高速获取任何信息的需求To TCP| IP protocol of improvement and the next generation satellite broad band multi-media network to satisfy customer to obtain the need of any information anyplace and anytime at the high speed。卫星通信系统由于其优良的广播能力,在我国广袤的西部地区将大有用武之地in virtue of satellite communications system has the good broadcasting ability , in the our country wide western region will bel availability
