| The digital satellite system of television broadcasting is nowadays the important part of the transmission net of television broadcasting. Its advantages are long transmission distance, great cover area, high transmission quality and big capability, meanwhile, its characteristics like the open, wireless long-distance, point to surface transmission mode made it easily be interfered. How to monitor the transmission system for high quality and control the interference effect is the main question of my research.Firstly, with the beginning about the basis concepts of satellite communication and digital television broadcasting system,this thesis analyzes the characteristics, components and transmission process. Secondly, after surveying the transmission channel, the RF layer, the performance of satellite transmitter is mainly studied. Then starting with the changes which were imposed on the signal and spectrum with interference, the analysis of the changing process of downlink.channel parameters with the experience and data in practice is presented, mainly judging by the transmission channel EVM and the channel power. Finally, how to design a anti-jamming monitor system for satellite digital television broadcasting is described. |
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