扩频信号捕获技术的研究与仿真

发布时间：2018-06-27 03:12

本文选题：M序列 + FFT　；参考：《东北石油大学》2014年硕士论文

【摘要】：现代通信系统发展的主要方向要建设一个远距离、大容量，具有较好传输质量且保密性强的适合于现代社会经济发展的通信网络。扩频通信以其独有的特点恰好迎合了现代经济发展的需要，具有非常广阔的应用前景。扩频通信的核心思想就是利用牺牲传输信号带宽的方法实现低信噪比条件下信号的可靠传输。但是扩频通信的一个缺点就是传输同样的信息条件下输送更多的比特流，并且对于信号的捕获和解扩过程会带来麻烦。本文在扩频通信理论的基础上，，研究了扩频信号的捕获方法和相关技术，并使用MATLAB工具对信号的产生和捕获进行了仿真分析。具体研究工作如下： 1.根据扩频通信的基本理论，研究了扩频信号的产生原理和产生过程，并且深入分析了软件实现伪码序列的方法（包括M序列和Gold序列）。 2.分析了扩频信号伪码的自相关和互相关特性，并深入研究了伪码同步技术。 3.针对高动态的GPS扩频卫星通信信号进行研究，掌握GPS中所使用的伪码序列的具体码序列，并研究了GPS接收机的接收过程。 4.在掌握了高动态扩频信号的完整理论的基础上，深入研究了FFT扩频信号的快速捕获技术，并利用MATLAB工具进行了仿真研究。
[Abstract]:The main direction of the development of modern communication system is to build a communication network with long distance, large capacity, good transmission quality and strong confidentiality, which is suitable for the development of modern society and economy. Because of its unique characteristics, spread spectrum communication meets the needs of modern economic development and has a very broad application prospect. The core idea of spread spectrum communication is to realize the reliable transmission of signal under low SNR by sacrificing the bandwidth of transmission signal. But one of the disadvantages of spread spectrum communication is that it can transport more bit streams under the same information condition, and it will bring trouble to signal acquisition and despreading. Based on the spread spectrum communication theory, this paper studies the acquisition method and related technology of spread spectrum signal, and simulates the signal generation and acquisition with MATLAB tool. The specific research work is as follows: 1. According to the basic theory of spread spectrum communication, the generating principle and process of spread spectrum signal are studied, and the method of software realizing pseudo code sequence (including M sequence and Gold sequence) is analyzed. 2. The autocorrelation and cross-correlation characteristics of spread spectrum signal pseudo codes are analyzed, and the pseudo code synchronization technology is studied. 3. The high dynamic GPS spread spectrum satellite communication signal is studied, the specific code sequence of the pseudo code sequence used in GPS is grasped, and the receiving process of GPS receiver is studied. 4. On the basis of mastering the complete theory of high dynamic spread spectrum signal, the fast acquisition technology of FFT spread spectrum signal is deeply studied, and the simulation research is carried out by using MATLAB tool.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914.42

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