Research On The Line Guarantee Method Of The Satellite Relay System On Motion State

Recently, the remote mobile broadcast has been paid more and more attention with the development of television industry, the satellite communication system which is called the satcom on the move becomes an important way to realize the broadcast. However, due to the signal transmission of the satellite communication system the satcom on the move is only a single link, the signal flow problems of the satellite communication system the satcom on the move become an important research topic and a transfer problem, which the TV technical engineers has been committed to solve. Considering the diversity and complexity of the broadcast environment, the diverse signal transmission schemes to ensure the safety have been proposed. This paper aims at the variety of signal line protection scheme, researches the characteristics of various protection scheme and chooses the most safe, feasible, simple and convenient security solutions to transmit high quality television signal to the receiver. The ultimate goal of this paper is to choose the best satellite communication system the satcom on the move protection scheme according to the different working environment to protect the broadcast signal without interruption of transmission.This paper combines the channel model of the satellite communication system the satcom on the move and the three kinds of working state of the satellite communication transmission link, analyzes the link break reasons of the satellite communication transmission. According to the break reasons, this paper researches the corresponding solving strategy. First, this paper researches the signal protection scheme by adjusting the parameters to change shadowing state, and then analyzes the transmission signal way of the satcom on the move, proposes the backup links safeguard scheme, the backup uplinks safeguard scheme, and draws the system structure finally. In the backup links safeguard scheme, this paper respectively researches the microwave safeguard scheme subsystem, the 4G mobile safeguard scheme subsystem and the fiber optic safeguard scheme subsystem, and then draws these system structure separately. Comparative researching of the advantages and disadvantages of the several kinds of protection scheme, and the mixed protection scheme's advantages have been summarized. In the backup uplinks safeguard scheme, this paper proposes the satellite-terrestrial hybrid system and draws the system structure, and aiming to the satellite communication system performance optimization issue, this paper further researches the protection scheme and simulation. The satellite-terrestrial hybrid safeguard scheme could be used as the signal transmission for the next generation of the broadcasting system, therefore, the research has the certain forward-looking. This paper assesses the start using timing of satellite communication transmission link safeguard scheme with ITU-R experience model, and describes the signal attenuation distribution in Dalian district by using Asiasat-3S according to the calculated. This paper focuses on the 4G mobile safeguard scheme subsystem, researches the TXD. transmission and RXD combining with the actual use requirement, and describes the feasibility according to the 4G signal coverage of a section in Dalian when the 4G mobile safeguard scheme subsystem used as the backup links safeguard scheme in the actual use.Combined with the actual application and the comparison of the signal status accompanied by the parameters adjustment, this paper draws the conclusion that the transmission state of the satellite communication link would change when adjusting the parameters. And by the combination of the actual application and the comparison of the backup link signals variation along with the parameters adjustment, this paper comes to a conclusion that the backup links safeguard scheme is feasible, which could guarantee the satellite communication link without signal interruption on motion state.