摘要如今，卫星导航定位系统在不同领域所发挥的作用日益重大，例如手机、车载GPS导航定位等民用商业领域，以及现代战争中的军事卫星应用等国防领域等。在此背景下，为了深入并直观地了解GPS卫星定位系统构成原理，本课题在学习熟悉GPS系统组成、信号发射和接收原理的理论基础上，搭建仿真电路，验证信号的产生和接收算法。

本文首先对GPS信号的生成发射和接收原理进行理论研究，然后在仿真软件SystemView中搭建单星和多星的GPS信号生成发射和接收电路，原理性地模拟信号的产生和接收。通过仿真分析，验证了该电路系统可基本实现GPS信号的生成和接收功能。64596

毕业论文关键词  GPS信号   仿真软件  扩频通信  解调解扩 

毕业设计说明书（论文）外文摘要

Title    The simulation research of GPS satellite signals         based on SystemView                                                 

Abstract Today, satellite navigation and positioning system in different areas plays a increasingly significant role , in the civil business such as mobile phones, GPS navigation and positioning, and in the national defense fields like the application of military satellite  in the modern war, etc. In this background, in order to get the in-depth and intuitive understanding of the principle of GPS satellite positioning system, this topic is based on the study of GPS system composition, principle and signal’s transmit and receive theory, building the simulation circuit to test signal generating and receiving algorithm.

  In this paper, studying theory of the generation of launch and receive GPS signals principle firstly, and then set up the single and multiple GPS signal generation transmission and receiving circuit in the software of SystemView, simulating it original in the principle. The system is verified by simulation analysis that it can basically realize the GPS signal’s generated and receiving function.

Keywords  GPS signal  The simulation software  Spread spectrum communication  Solution to mediate enlargement 

1  绪论 1

1.1  研究背景 1

1.2  本课题的研究目的和意义 1

1.3  课题研究内容 2

2  GPS系统原理 2

2.1  GPS系统组成及其相应仿真要求 2

2.1.1  GPS系统组成 3

2.1.2  GPS仿真要求 3

2.2  GPS信号原理及其特性 3

2.2.1  GPS信号的频率特性、调制方式及其特性 4

2.2.2  C/A测距码产生方法 6

2.2.3  P码测距码生成原理及其实现 8

2.2.4  GPS数据码特性 8

3  GPS信号仿真方法研究 8

3.1  直扩通信原理及其仿真 9

3.1.1  扩频通信系统原理 9

3.1.2 信号的直接序列扩频原理及其实现方式 9

3.1.3 直接序列扩频信号接收原理及其实现方式 11

3.2 GPS信号仿真平台整体设计