【作者】 王超；

【导师】 张中兆；

【作者基本信息】 哈尔滨工业大学 ， 信息与通信工程， 2007， 硕士

【摘要】 卫星定位系统在军事和民用领域的使用已经日益广泛,因此卫星导航定位系统的建设都受到各国政府高度重视。目前,除了美国GPS卫星定位系统外,还有俄罗斯的GLONASS系统,以及欧盟正在建设的Galileo系统。中国建成了北斗一代,正在建设北斗二代系统。由于GPS系统和Galileo系统均使用二进制偏移载波调制(BOC)信号,因此对其同步技术的研究越来越受到国内外众多学者的重视。在此背景下,本文对BOC信号进行研究。研究内容主要包括BOC信号的特性,BOC信号同步技术的研究以及其软件接收的方案设计。首先,对于最早提出使用BOC信号的GPS M码(军用码)进行了介绍,主要介绍了M码的定义,频谱,调制方式等。然后对M码所使用的BOC信号性质进行了仿真分析,主要包括功率谱,自相关函数特性以及多径特性等。针对BOC信号的特性,对其同步技术进行研究。由于信号的自相关多峰值特性,研究了其与普通扩频码同步方式的区别。然后对现有的BOC同步技术进行归类研究,总结各种方案的优缺点。本文重点针对GPS M码所使用的BOC(10,5)这样的自相关函数多峰值信号,以单边带同步算法为基础,提出了基于FFT的单边带BOC同步方案,并对此方案进行了仿真验证和性能分析,并对该方案的优缺点进行了总结。最后,作为文章的补充部分,以前面提出的改进的BOC同步技术为基础,对于使用BPSK/BOC信号的GPS/Galileo软件导航接收机进行系统框架设计,提出软件系统架构及流程设计方案。更多还原

【Abstract】 Satellite Positioning System is used more and more widely in military and civil domain nowadays, so all the governments pay much attention to it. At present,besides GPS system there are many satellite navigation & positioning systems in development such as GLONASS by Russia, Galileo by Europe, and BeiDou-1 & BeiDou-2 systems by China. Binary Offset Carrier (BOC) that the GPS M code and Galileo signals use is recognized by more and more researchers.In the background above, BOC signal is studied in the paper. The characters and synchronization of BOC signal are studied. It also concerns design of software receiver of BOC signal.First, The GPS M code(military code) which use BOC signal is discussed. It mainly concerns the defining, spectrum and modulation types of M code. Then BOC signal which GPS M code uses is analyzed by computer simulation about power spectrum, correlation and multi-path.Aiming at the characters of BOC signal, the synchronization methods are discussed. Because of the multi-peak in autocorrelation, the synchronization of BOC signal is different from that of normal spread spectrum signal. Then synchronization methods which are normally used are analyzed and the advantages of these methods are summarized.Considering BOC(10,5) signals which GPS M code use and whose autocorrelation has multi-peaks, a new method using FFT technique is proposed and its performance is analyzed by computer simulation based on the sideband synchronization algorithm. Then the advantage and disadvantage of this method is discussed.Finally, as a supplement of this paper, based on the new method concerned above, a GPS/Galileo software receiver of BPSK/BOC is designed. Software structure and date flow of this receiver are discussed.更多还原