Direct broadcast satellite business files: the main mode of operation of the Puz
Track, technology, policy, physical, operations … … This series of key words, concentrated together, woven from the domestic industry over the years in the business expectations of DBS. 129 orders in the state's rules, individual reception of satellite television market should be shielded, but despite repeated prohibitions of the "pot" promotional advertising impresses the underground market boom, while also reflects the huge development potential of the legitimate market.
Plan if the launch will not change, then the next, the year after this time, with the Sino 2 and 9 in the two main satellite, satellite equipment off one after another, China will move into the digital broadcast satellite era.
Be opened in new markets, industry has been activated off was opened on the eve of competition, carding in the past, present and future, is a very interesting thing, it is a rather sensitive matter. So, standing commercial point of view, the combination of domestic and international, we tried to as concise as possible outline, sketch out a direct broadcast satellite business records.
Here to thank Communication University of China, "China's satellite television industry manager of the" discussion group, there are "satellite TV and broadband multimedia" magazine, and a number of industry veterans, they provide a great deal of information on this reference and the rich intellectual insights, in this integrated form the basis of this text and hope to give readers a useful thought.
Evolution of technology From a technical point of view, direct broadcast satellite that was not mysterious, is actually built in the air of a huge signal enhancer. Satellite transmission of good quality construction, low cost, wide coverage. In theory, the Earth only three satellites will be fully covered.
20 century, 60's, the satellite began to be used worldwide radio and television industry. The application of the basic model is through the communication satellite C-band transponders will be launched to the ground analog TV, cable TV or other group receiving system, and then delivered to the user at home, that is "assigned" type of satellite television.
70 -80 late early, analog satellite broadcast start trying to enter the family, CNN, HBO, ESPN and other well-known commercial satellite TV channels resulting prosperity. However, without digital compression of television signals, each transponder can only live the way a TV program, the high cost constraints, is the analog satellite broadcast always cross the threshold, however.
Great digital tension in the early 90s made a high compression ratio of video and audio signal transmission possible. December 1993, Hughes made the U.S. the world's first digital compression technology, TV broadcast satellite systems, high-power Ku-band in the use of satellite transponder system, the satellite first real possibility for the individuals directly business users, users only need to install the 0.45m diameter satellite dish, you can watch hundred of programs. And, as with encryption and scrambling technology, conditional access and pay to watch inevitable. Cost reduction and revenue open to direct broadcast satellite home (DTH – DirectTo Home) business dream into a reality.
ITU (ITU) provides for the satellite broadcasting business, dedicated band (BSS), digital satellite broadcast with two technology options, one is the use of fixed communications satellite (FSS) launch DTH services, the other is through special high-power radio and television dedicated satellite launched DBS (DirectBroadcast SatelliteService) business, in addition to Ku-band, there are more suitable for transmission of the Ka-band high-definition television signals. DBS one for the technical characteristics of radio and television, is more favorable than the average communications satellite information to protect national security, its coverage by the international Convention on the protection. In order to avoid the wave of the "overflow" and the mutual interference, each country for the direct broadcast satellite orbital position, the number and polarization beam satellite, channel numbers, and the interval between adjacent satellites, the satellite antenna and earth station antenna beam width, pointing error, G / T value, modulation, bandwidth, etc., have been assigned specific requirements. DBS has also become China's plans to develop the form of live satellite TV business.
Because of the relatively short development time, it was strictly assigned specific band (see Table 1), currently in orbit satellite radio and television broadcast less than the number of communication satellites. With the technology, a new generation of high-power communications satellites fixed satellite service (FSS) transponders, in the power, capacity, life, EIRP and so no less than the specific direct broadcast satellites. Meanwhile, a small communications satellites also carry a BSS-band transponders to provide DBS service.
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