【作者】 丁玲；

【导师】 刘军民；

【作者基本信息】 大连理工大学 ， 电子与通信工程（专业学位）， 2016， 硕士

【摘要】 近年来,随着电视产业的发展,远程移动直播方式越来越被关注和应用,“动中通”卫星转播系统是实现远程移动转播的重要手段。但是“动中通”卫星通信信号的传输只有单一链路,当遇到遮挡问题出现信号阻断的时候直播信号出现中断,在广播电视系统中这是不被允许的,因此“动中通”卫星转播信号线路的畅通问题成为一个重要的研究课题,也是国内外电视技术工程师一直致力解决的传输难题。由于转播环境的多样性和复杂性,导致保障信号传输安全的方案也随之多样化。论文围绕多种线路保障方案,研究各种保障方案的特点以及选择保障最佳方案能够最安全可行、最简单方便的将电视转播信号高质量地传输到接收端。本文的最终目的是根据不同的工作环境选择最佳的“动中通”卫星转播信号保障方案,保障转播信号的无中断传输。本文结合“动中通”卫星转播系统信道模型和卫星通信链路的三种工作状态,分析“动中通”卫星转播系统的链路中断原因。根据中断原因,研究解决策略。首先研究通过调整参数改变遮蔽状态的信号保障方法;其次分析移动传输信号的方式,提出了备链路保障方案和备上行链路保障方案,并分别绘制系统结构图。其中在备链路保障方案中,分别研究微波补偿子系统、4G移动补偿子系统和光纤补偿子系统,并给出这几种补偿系统各自的结构图。比较研究几种线路保障方案单独使用时的优缺点,总结混合补偿系统有取长补短的优势。在备上行链路保障方案中,提出陆地卫星中继合作融合系统并绘制系统结构图,同时对该保障方案就“动中通”卫星转播系统性能上的优化进行研究和仿真,并绘制仿真图。陆地卫星中继合作保障方案可以用作下一代广播电视系统信号传输手段,对其研究具有一定的前瞻性。利用ITU-R经验模型评估启用“动中通”卫星转播线路保障方法的时机,并根据计算绘制大连地区使用亚洲3S卫星传输信号的衰减分布。本文结合实际使用需求,研究4G移动补偿子系统的发射端、传输过程和接收端,并根据大连地区某一路段的4G覆盖情况论证4G移动补偿子系统作为备链路保障方案在实际使用过程中的可行性。本文结合实际应用,通过对比调整参数前后的信号状态,论证通过调整参数可以改变卫星通信链路传输状态这一结论,并验证了这种保障方案的可行性;同样结合实际应用,通过比较采用备用链路前后的信号效果图,论证备链路保障方案可行,可以保障“动中通”卫星转播信号无中断。更多还原

【Abstract】 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.更多还原