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Independent innovation and service national industries by fdhjkl rfghjtkl
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Independent innovation and service national industries |
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Business,Business News,Business Opportunities
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2008 6 9 20 15 points at the Xichang Satellite Launch Center in China with "Long III B" carrier rocket successfully " Chinasat 9 "Radio and television broadcast satellite into space. After about a month in orbit commissioning, the smooth delivery of satellite 9. Under the arrangement, China will first of all means of the use of satellite broadcast as" during "Radio and Television" Villages "The main construction project means, through direct broadcast satellite to the masses in remote areas to provide high-quality, content-rich radio and television programs and information services. Meanwhile, satellite broadcast systems in China, also will be the first independent research and development in China satellite signal transmission technology system "advanced satellite broadcasting system (ABS-S)". as the technical system involved in the research work of the technical staff, we believe that ABS-S technology and industrial base in the preparation process of innovation on how to play the advantage, national industries to a useful exploration. We hope that through this paper, in which bits of harvest for summary, and the vast majority of radio and television research and staff exchanges.
1, adhere to independent innovation, and Take Advantage
2005 year, China decided to launch private radio and television broadcast satellites and direct broadcast satellite business. Administration attaches great importance to this work. Taking into account the pre-broadcast satellite applications at some of the problems encountered and the demand for direct broadcast satellite applications, in order to both the technical institutional capacity of full play to direct broadcast satellite, while able to broadcast radio and television to provide a reliable guarantee security, General self-made research satellite broadcast transmission technology system requirements and has organized experts on the necessity and feasibility of the project fully demonstrated. Demonstrated in the study based on self-financing Administration launched a special Chinese satellite broadcast signal transmission technology system technology specific research, undertake specific research by the extensive work of ASTRI. Administration of the relevant requirements under the leadership of the project team established at the outset of the project must have "independent innovation, practical application of advanced security and research with a combination of" core principles.
For the safe, viable premise, embodied innovation is a challenge of the work. Start early in the project on behalf of satellite transmission technology with the latest international standards of a new generation of satellite broadcasting technology standard DVB -S2 has just been released, this is the technology research and higher requirements. The project team will research objectives identified in the digestion and absorption of the latest international standards for design ideas based on merit, through independent research and development of technical means to achieve the same or even higher level of technology. Rigorous analysis of the simulation, we understand the advantages of the latest international standards and characteristics, but also analyzed the areas for improvement, determine the technical route to China's reality.
Example, channel coding technology, DVB-S2 by means of a number of enhanced design defects make up, but at the same time to achieve performance requirements, increased complexity and implementation costs; Moreover, modulation and frame structure design also affected the lack of optimization of overall system performance and flexibility, can not meet the technical conditions for our direct broadcast satellite. And based on our preliminary channel coding technology in the areas of research and technology accumulation, through targeted technical research, can come up with better technical solutions.
This end, the project team defined the "optimal system, focused on breakthrough" ideas of independent innovation. ASTRI wide project established a strong technical team and the support of the General Conditions given sufficient protection. Based on early in the areas of channel coding based on years of research and technology accumulation, through technical research, the project team at the end of 2005 core technology based on independent satellite broadcast transmission technology system, ABS-S. The program channel coding, bit interleaving, modulation and frame structure design to achieve a technological breakthrough, using new technology to ensure our satellite broadcast system with better transmission performance, flexibility and lower implementation costs, the the main advantage for innovation:
(1) ABS-S channel encoding in the design of more optimized than the DVB-S2. In the ABS-S, only the use of LDPC codes as channel, but not used as the outer BCH code, improve transmission efficiency, while still achieving a 10-7 following error flat, which fully reflects the technical level and technical advantage. I am an expert from China Agriculture Net, usually analyzes all kind of industries situation, such as natural maple kitchen cabinets , shower bar mixer valve.
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