导航信号生成及捕获方法研究

发布时间：2018-01-30 17:00

本文关键词： GPS GALILEO 导航信号调制方式匹配滤波捕获　出处：《中国科学院研究生院（国家授时中心）》2013年硕士论文　论文类型：学位论文

【摘要】：随着GPS现代化和其他新兴导航定位系统如Galileo系统、“北斗二代”卫星导航系统的逐步开发完善，新型信号调制技术正在逐步取代旧式PSK-R信号调制技术，BOC信号调制技术应运而生。BOC调制信号具有显著的频谱分裂特性，能与原有的卫星导航信号互相兼容，同时可以使导航系统获得更高的跟踪精度和抗多径干扰性能。BOC调制方式具有广阔的应用前景，，其同步技术的研究引起了国内外广大学者的重视。本论文的主要研究内容如下： 1.介绍了国际上正在使用的GNSS系统概况，并对几种GNSS系统的信号调制方式进行了研究。以Galileo E1频段和GPS L1频段为重点，深入分析了CBOC信号调制方式和TMBOC调制方式的调制原理；以Galileo E5频段为重点深入分析比对双码AltBOC、标准AltBOC和恒包络AltBOC信号调制方式的调制原理。 2.研究了GPS L1、GalileoE1和E5频段导航信号生成技术：通过数学推导产生GPS C/A码和GPS Weil码，并仿真出GPS L1频段信号；研究了Galileo E1频段信号，并用MATLAB仿真了E1频段的数据通道信号和导频通道信号；研究了Galileo E5频段的信号组成、扩频码生成及子载波生成等内容，并通过MATLAB仿真了Galileo E5信号。 3.介绍了传统导航信号的捕获方法，分析了各种导航信号的跟踪精度和多径误差，重点研究了基于FFT匹配滤波器捕获算法，从原理和实现两个方面研究了能够并行处理的匹配滤波器算法，并用此方法完成了对GPS L1民用导航信号的捕获并获得捕获结果。
[Abstract]:With the modernization of GPS and other emerging navigation and positioning systems such as Galileo system, the "Beidou second generation" satellite navigation system is gradually developed and perfected. New signal modulation technology is gradually replacing the old PSK-R signal modulation technology. It can be compatible with the original satellite navigation signal, and can make the navigation system achieve higher tracking accuracy and anti-multipath interference performance. BOC modulation has a broad application prospects. The research of synchronization technology has attracted the attention of scholars at home and abroad. The main contents of this thesis are as follows: 1. The general situation of GNSS system in the world is introduced. The signal modulation modes of several GNSS systems are studied. The emphasis is on the Galileo E1 band and the GPS L1 band. The modulation principle of CBOC signal modulation and TMBOC modulation is analyzed. The modulation principle of dual code AltBOC, standard AltBOC and constant envelope AltBOC signal modulation is analyzed in detail in Galileo E5 band. 2. The technique of generating navigation signal in GPS L1G GalileoE1 and E5 band is studied. The GPS C / A code and GPS Weil code are generated by mathematical derivation. The GPS L1 band signal is simulated. The Galileo E1 band signal is studied, and the data channel signal and pilot channel signal of E1 band are simulated by MATLAB. The signal composition, spread spectrum code generation and subcarrier generation of Galileo E5 band are studied, and the Galileo E5 signal is simulated by MATLAB. 3. The traditional navigation signal acquisition method is introduced, the tracking accuracy and multipath error of various navigation signals are analyzed, and the acquisition algorithm based on FFT matched filter is studied emphatically. The matched filter algorithm which can be processed in parallel is studied from the aspects of principle and implementation. The acquisition of GPS L1 civil navigation signal is accomplished by this method and the acquisition results are obtained.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4

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