【作者】 刘波；

【导师】 徐定杰；

【作者基本信息】 哈尔滨工程大学 ， 导航、制导与控制， 2006， 硕士

【摘要】 GALILEO系统是欧洲自己的卫星无线电导航系统，于2002年3月由欧盟各国交通部长正式签署协议开始建设，预计2008年投入运营，这标志着美国的GPS系统将结束其在世界独占鳌头的局面。2004年10月，我国和欧盟签署了中国参与GALILEO计划的技术合作协议，投资2亿欧元，标志着我国航天事业在国际合作领域迈出走向欧洲化的第一大步。在这种国际卫星导航系统发展背景下，研究GALILEO接收机系统将具有十分重要的作用。 论文首先从GALILEO系统的总体结构和组成出发，介绍GALILEO系统的信号结构及其服务方式，讨论系统的通信基础—扩频通信理论及系统的定位原理，并对影响系统定位精度的因素进行了分析。在扩频通信中，接收机系统的关键技术是实现扩频信号的快速捕获与可靠跟踪，基于GALILEO系统的特性，在参考国内外大量关于卫星导航和扩频接收机资料的基础上，本文提出一种基于FFT算法的并行快速捕获方法，从理论和数学推导上给予阐述；在未知载波频率和相位的情况下，GALILEO接收机采用非相干超前—滞后数字锁相环(DDLL)和数字科斯塔斯环(DPLL)实现对伪码和载波的可靠跟踪，本文详细研究了DDLL环的数学模型，对其线性特性和非线性特性都进行了详细的推导，并给出DPLL环的数学模型及其线性特性，得到环路稳定工作的条件。 本文还研究了GALILEO接收机中的多径效应，推导多径效应引入的环路跟踪误差，并提出两种消除多径效应的方法。最后，论文给出单通道信号处理模块的结构框图，实现其中伪码DCO模块和载波DCO模块的电路设计；在分析软件系统主要任务的基础上，给出软件系统工作流程。更多还原

【Abstract】 Galileo is Europe’s own satellite wireless navigation system. Minister of each country’s ministry of communications in European Union formally subscribed the agreement and started to build on March 2002. It is forecasted to be launched into use in 2008, which is the terminative sign of American GPS system’s being the champion in the world. Our country subscribed the technological cooperation agreement of China’s participation into the Galileo scheming on October 2004. China agreed to invest a total of 200 million euros, which signed a huge pace of national spaceflight project walk up to Europe in international cooperation field. Under this developing background of international navigation system, the research of Galileo receiver system has much importance.The paper begins with the structure and composing of Galileo system. The signal structure and service mode are introduced, spread spectrum communication theory-communication basis of system and positioning principle are discussed, and the factors that influence positioning precision are analyzed. In spread spectrum communication, the key technology of receiver system is to realize the fast capture and credible track of spread spectrum signal. On the basis of Galileo system’s characteristic and consulting a large quantity of datum concerning satellite navigation and spread spectrum receiver both at home and abroad, the text presents a parallel fast acquisition mode called FFT-based algorithm and expatiates it theoretically and through mathematical discursion; With unknown frequency and phase of carrier, the Galileo receiver adopt noncoherent early-late tracking loop (DDLL) and digital Costas loop (DPLL) to realize credible track of PN code and carrier. The paper traverses the math model of DDLL loop and discussed the performance in linear and non-linear situation in detail. The math model and linear characteristic of DPLL loop are presented and the stable condition is achieved.The multi-path effect in Galileo receiver and loop track error caused by multi-path effect are discussed, two methods of eliminating multi-path effect are presented. Finally, the structure frame of single-channel signal processing module is given, the circuit design of DCO module of PN code and carrier is realized; the更多还原