matlab gps 卫星导航信号,基于MATLAB的GPS信号仿真123.doc

《基于MATLAB的GPS信号仿真完整源代码123》

摘 要

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关键词：；MATLAB；

Abstract

As the new generation of the satellite navigation systems, Global Positioning System (GPS) is more and more important in military and civil fields in recent years. Though the development of science and technology, the technology of navigation and orientation has been progressed to the direction of great precision and dynamic.With the wide application of GPS locating, every country develop our best to make contribution to the positioning and navigation industry of our country.

This paper mainly studies the generation of GPS signal, and the algorithm of PN code is very important in GPS signal generation. As m sequence is the basis of PN code generation, this paper firstly explains the m sequence’s generative principle in detail and the characteristics of autocorrelation and cross correlation. On the basis of m series, then this paper introduced C/A code generation principle in detail.As P code is one of the focuses of PN code, and the generation of P code is relatively complex, this paper makes detailed analysis about it.

In the platform of MATLAB software simulation, this paper successfully completes the GPS signal generation, and demonstrates the correlation characteristics of PN code visually.It has done a good simulation of the content about this paper.

Keywords: Global Positioning System; PN code; MATLAB simulation; correlation characte-ristics

目 录

1 绪论1

1.1 GPS的应用1

1.2 本文研究的主要内容2

1.3 本文研究的目的和意义3

2 GPS信号理论及MATLAB软件简介4

2.1 GPS系统简介4

2.2 GPS信号结构5

2.2.1 载波7

2.2.2 伪码9

2.2.3 导航电文10

2.3 伪码12

2.3.1 m序列12

2.3.2 易捕码C/A码16

2.3.3 精码P码20

2.4 扩频与调制24

2.4.1 扩频通信24

2.4.2 GPS信号的调制25

2.5 MATLAB软件简介26

2.5.1 MATLAB简介26

2.5.2 M文件简介27

3 GPS信号仿真程序设计33

3.1 数据码33

3.2 C/A码34

3.2.1 C/A码的生成及扩频调制34

3.2.2 C/A码的相关性分析35

3.3 P码36

3.3.1 P码产生及扩频调制36

3.3.2 P码的相关性分析39

4 结果分析40

4.1 C/A码40

4.1.1 C/