通信学(工程)论文(5)

1．硬件资源共享。可以在全网范围内提供对处理资源、存储资源、输入输出资源等昂贵设备的共享，使用户节省投资，也便于集中管理和均衡分担负荷。

1. The hardware resource sharing. Can be dealt with within the scope of the entire network to provide the resources, storage resources, expensive equipment such as input and output of resources sharing, the user to save investment, also facilitate centralized management and balanced share the load.

2．软件资源共享。允许互联网上的用户远程访问各类大型数据库，可以得到网络文件传送服务、远地进程管理服务和远程文件访问服务，从而避免软件研制上的重复劳动以及数据资源的重复存贮，也便于集中管理。

2. The software resource sharing. Allows users of the Internet to remote access to all kinds of large database, you can get the network file transfer service, remote process management services and remote file access service, so as to avoid the repeated labor in the software development and data resources repetition of storage, also facilitate centralized management.

3．用户间信息交换。计算机网络为分布在各地的用户提供了强有力的通信手段。用户可以通过计算机网络传送电子邮件、发布新闻消息和进行电子商务活动。

3. The information exchange between users. Across a computer network for distribution in the user provides a powerful means of communication. The user can send an email through the computer network, publish news and e-commerce activities.

通信工程对于信息领域的另外一个重要的贡献在于卫星通信，尤其是中国的北斗星卫星计划就是一个有力的说明 北斗卫星导航系统是中国自行研制开发的区域性有源三维卫星定位与通信系统（CNSS），是除美国的全球定位系统（GPS）、俄罗斯的GLONASS之后第三个成熟的卫星导航系统。可在全球范围内全天候、全天时为各类用户提供高精度、高可靠的定位、导航、授时服务，并兼具短报文通信能力。第八颗和第九颗北斗卫星于2011年被长征三号甲运载火箭送入太空预定转移轨道。2011年12月，北斗卫星导航系统新闻发言人冉承其表示，北斗卫星导航系统将在2020年形成全球覆盖能力。近年来卫星通信新技术

的发展层出不穷。例如甚小口径天线地球站(VSAT)系统，中低轨道的移动卫星通信系统等都受到了人们广泛的关注和应用。卫星通信也是未来全球信息高速公路的重要组成部分。它以其覆盖广、通信容量大。通信距离远、不受地理环境限制、质量优、经济效益高等优点,1972年在我国首次应用，并迅速发展,与光纤通信、数字微波通信一起，成为我国当代远距离通信的支柱。

Communication engineering for another important contribution in the field of information lies in satellite communications, especially in China's big dipper satellite program is a powerful explanation Beidou satellite navigation system is developed by China's regional active 3 d satellite positioning and communication system (CNSS), is in addition to the U.S. global positioning system (GPS), the third after Russia's GLONASS satellite navigation system. But on a global scale with high precision, all-weather, for all kinds of users throughout the high reliable positioning, navigation and timing services, and with short message communication skills. The eighth and ninth beidou satellite in 2011, was the long March 3 a rocket into space is scheduled to transfer orbit. In December 2011, the beidou satellite navigation system, a spokesman for RanCheng its said the beidou satellite navigation system will be formed in the 2020 global coverage. In recent years the development of satellite communication technology emerge in endlessly. Such as very small earth station antenna (VSAT) system, the movement of the low and middle orbit satellite communication system has received widespread attention and application. Satellite communication is an important part of global information highway in the future. It with its wide coverage, large capacity of communication. Communication distance, without being limited by the geographical environment, high quality and economic benefit, etc. The application in our country for the first time in 1972, and the rapid development, together with the optical fiber communication, digital microwave communication, became the mainstay of the contemporary long distance communication in our country.

卫星通信由于它不受地理条件的限制，具有灵活的可移动性，所以仍依它的优势创新发展。但亦受到迅速发展的光纤通信的挑战，它比卫星通信的容量大，传输速率高，有很多越洋通信被海底光缆所替代，陆地干线亦有类似情况。20世纪90年代中后期卫星电视直播(DBs——Direct Broadcast Satellite或DTH——Direct To Home)、卫星声音广播、卫星移动通信以及卫星宽带多媒体通信成为新的四大发展潮流。 Satellite communication because it is not limited by geographical condition, with flexible mobility, so is still in accordance with its advantages of innovation and development. But also by the challenge of the rapid development of optical fiber communication, it is larger than the capacity of satellite communications, the transmission rate is high, there are a lot of overseas communications were replaced by a submarine cable, main land also has a similar situation. In mid and late 1990 s Satellite television Broadcast (DBs, Direct Broadcast Satellite or DTH - Direct To the Home), Satellite voice Broadcast, Satellite mobile communication and Satellite broadband multimedia communication becomes the new four development trend. …… 此处隐藏：2429字，全部文档内容请下载后查看。喜欢就下载吧 ……