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留学生作业代写:Satellite communications

2017-09-16 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- Satellite communications,供大家参考学习,这篇论文讨论了卫星通讯。如今,通信卫星的功能随着卫星高新技术的不断出现、推广而扩大,所应用的领域也正在不断扩宽。在未来,卫星通讯将拥有更广阔的发展空间,并占据更加重要的地位。与光纤通信一起,发展成为一项供未来人类通信的最为重要的手段。

Satellite communication,卫星通讯,assignment代写,paper代写,留学生作业代写

Nowadays, satellite communication is ubiquitous and permeates every aspect of life. Two major advantages of satellite communication: wireless coverage of communication capacity. In the new era of communication, satellite communications will play a leading role. Satellite communication technology, the information and communication industry is moving forward rapidly, the country has introduced a series of relevant laws. From the research of satellite communication in recent years, the paper obtains the general development of Multibeam wire and star Exchange, enumerates the great challenges that satellite communication will face in future development, and forecasts the foreground of satellite communication.

1964, the International Communications satellite Organization INTEL-SAT in the United States headquarters, the same year launched the world's first commercial satellite, after a half-century of continuous development, compared with the 1950s satellite communications, today's satellite communications have made many breakthroughs. Satellite communications are widely used in agriculture, commerce and military areas that are closely related to us. In daily life, satellite communication occupies a high position, for example, superb voice broadcasting and television broadcasts provide technical support by satellite communications, provide essential communications to remote areas, provide emergency communications to places where serious natural disasters occur, and provide timely live broadcasts of major events.

In short, for People's Daily life provides a great convenience. In the military field, satellite communications also play a great capacity. The advent of the new century, science and technology has been unprecedented development, and the increase in productivity, which also provides a strong theoretical support for the development of satellite communications technology and technical assistance.

Early, the use of transparent transponder to achieve intermediate transmission is a common means of GEO satellite communication, users can according to their own needs, the rental of different frequency transponder, a strong flexibility is a channel resources advantage.

Support for star Exchange is one of the most important functions of OBP. Among them, the regenerative OBP can support any kind of exchange, such as program-controlled circuit exchange, ATM Exchange and IP Exchange, because it can obtain the data stream transmitted by each signal. In particular, if the technology of IP switching can be achieved on the star, then the link between the terrestrial Internet and the satellite network becomes very simple and convenient.

The Space laser communication technology is a technology which uses the laser beam as the carrier in the free space, which can be used as the communication link between the satellite and the ground, as well as the transmission link between the satellite and the satellite. However, because the former can not complete normal communication in the presence of dense cloud or rain, the rate of information transmission is not very high as the communication link between satellite and ground. This technology will carry the information of the signal modulated to the beam sent, through the initial positioning and adjustment, and then through the beam capture, aiming and tracking, in the communication at both ends of the optical link to establish the transmission of information.

The backbone network is composed of three parts of computer LAN, CATV Network and cable Telecommunication network, in addition, the ground mobile communication cellular network is connected with backbone network through its own wireless core network, and the satellite communication network has established the link with backbone network through the wireless core network. In recent years, IP is the trend, because of the continuous IP of satellite communications, a variety of different properties and different services of satellite communication terminals have become similar to the Internet access equipment, this is evident. It should be noted that the IP described here does not represent the transmission and exchange of the satellite communication network, but is reserved for its special transmission and Exchange Mode, which is more advantageous to achieve higher utilization of satellite resources and higher level of business quality for the characteristics of satellite communications. With the continuous development of the Ka-band Leo Satellite Network, makes the frequency resources and the communication capacity to increase greatly, simultaneously, also to a certain extent reduces the user terminal cost, the satellite communication wireless coverage superiority also manifests, based on this, the satellite communication technology occupies a seat in the international civil communications market. However, in China, the situation is different, because compared to most foreign countries, China's 4G terrestrial Bee network in China's civil communications market occupies a large proportion, making satellite communications access to the Internet is far less competitive than 4G.

According to the current situation of our country, satellite communication technology can achieve the available frequency of geographical coverage density, compared to 4G of geographical coverage density, a few orders of magnitude lower.

Rapid development of digital communication and personal communications. In mobile satellite communications, LEO Satellite communication has great development prospects, can help to realize the future "global personal communication", so that people really enter the era of personal communication. With the continuous increase of satellite communication capacity and speed, as well as the continuous influence of advanced digital communication technology, the quality of digital satellite broadcasting has been greatly improved, the space of satellite TV broadcasting has been very abundant, and people's cultural standard of living has been improved.

With the continuous emergence, popularization and utilization of satellite technology, the function of communication satellites has been expanding. In the 21st century, satellite communications will have a wider space for development and occupy a more important position. Together with optical fiber communication, the development becomes one of the most important means for future human communication.

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