基于卫星重叠通信的应急救援通信系统研究

发布时间：2018-03-05 02:13

本文选题：卫星重叠通信　切入点：RS编译码　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于卫星通信具有覆盖范围广、通信容量大、传输距离远等特点,其在现代无线通信中有着良好的应用前景。重叠通信因其能够利用已有背景系统进行通信而越来越受到国内外研究者的重视。本文采用RS编译码算法和直接序列扩频技术设计了一个基于卫星重叠通信的应急救援通信系统,并对其关键技术进行研究和硬件实现。主要工作如下:1.通过调研结果,本文指出了当前应急救援通信系统中存在的不足,提出了一种基于卫星重叠通信的应急救援通信系统方案。2.介绍了卫星重叠通信的基本原理,分析了设计系统的应用背景环境和需求,并选择GEO卫星作为背景系统通信卫星。3.根据重叠通信基本要求和卫星链路预算的结果,论证了所设计系统的可行性。利用上述结果,确定了该系统发射机和接收机的结构功能,着重对该系统的同步方案进行了仿真论证。4.研究了RS码的编译码算法原理,分析了其纠错能力。通过QuartusII软件实现了RS编译码硬件仿真,并将其输出结果与软件编码结果进行比较,验证了硬件实现的正确性。此外,研究了直接序列扩频技术的基本原理及相关内容,并完成其FPGA设计。
[Abstract]:Because satellite communication has the characteristics of wide coverage, large communication capacity, long transmission distance, etc. It has a good application prospect in modern wireless communication. Overlapped communication is paid more and more attention by researchers at home and abroad for its ability to communicate with existing background systems. In this paper, RS encoding and decoding algorithms and direct sequences are used. The spread spectrum technology has designed an emergency rescue communication system based on satellite overlapping communication. The main work is as follows: 1.Through the research results, this paper points out the shortcomings of the current emergency rescue communication system. In this paper, a scheme of emergency rescue communication system based on satellite overlapping communication is proposed. The basic principle of satellite overlapping communication is introduced, and the application background and requirements of the design system are analyzed. The GEO satellite is chosen as the communication satellite of the background system .3.According to the basic requirements of the overlapping communication and the results of the satellite link budget, the feasibility of the designed system is demonstrated. The structural functions of the transmitter and receiver of the system are determined by using the above results. The synchronization scheme of the system is simulated and demonstrated. 4. The principle of RS coding and decoding algorithm is studied, and its error correction ability is analyzed. The hardware simulation of RS coding and decoding is realized by QuartusII software. The output results are compared with the results of software coding to verify the correctness of the hardware implementation. In addition, the basic principle and related contents of direct sequence spread spectrum technology are studied, and its FPGA design is completed.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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