Design Of Satellite Communication DVB-S/S2 Signal Recognition System

Digital Video Broadcasting(DVB)is widely used in the field of satellite communication digital multimedia services.Generally,it uses MPEG-2 coding,digital transmission and error correction technology.However,when a third party(non-cooperative party)intercepts signals through satellite antenna,it has many kinds of satellite signals,low signal-to-noise ratio(SNR)and sub-band.It is difficult to recognize and process satellite DVB signals accurately because of the poor service quality of audio-video and network data.Therefore,a set of satellite communication DVB signal recognition system is designed in this paper.The system has complete specifications and high integration,and can complete the search and determination,automatic collection,accurate analysis and control processing of DVB signal in effective time.This paper mainly designs the signal processing,audio and video processing and IP data processing modules in the system.In the signal processing module,based on the symbol decoding algorithm of frame synchronization,the hardware structure of DVB signal demodulation is designed,which realizes the automatic recognition and efficient demodulation of DVB signal,and collects,outputs and analyzes the data transmission stream after demodulation.In the audio and video processing module,it is based on DVB and MPEG2.Standard,designed video stream decoding and audio stream decoding scheme,combined with the actual acquisition of satellite DVB signal data,carried out a single program and multiple programs and encrypted data signal analysis;in the IP data processing module,through the TCP/IP protocol and IP over DVB type of service link layer standard analysis,set up.The scheme of IPv6 over DVB datagram recognition and processing is designed,and the functions of data classification and recognition,protocol analysis,multi-level filtering and multimedia protocol processing are realized.