GPS L5信号仿真与信号处理及定位解算方法研究

论文总字数：24266字

摘 要

随着科技的进步，全球定位系统（GPS）对人们生活的影响越来越大，现在在了各个场合都有了广泛的运用，在航海，航空，通信，交通测绘，气象，资源勘探等领域均有GPS的身影。而随着人们对GPS精度要求的不断提高，原有的GPS渐渐无法满足人们的需求，于是美国政府提出了GPS现代化计划。从民用部分来看，GPS 现代化计划对精度的改善主要就体现在新发射的L2C和L5信号，使用户能更加好地进行多余观测来提高定位精度，并有利于进行电离层传播误差修正。基于此，本文通过GPS L1信号及其捕获跟踪算法的简单分析引入对GPS L5信号的仿真、捕获及跟踪以及定位解算研究，并对GPS L5 信号的捕获跟踪以及定位解算算法用实测卫星信号进行验证。

本文针对GPS信号中的L1和L5进行了研究：首先，本文介绍了GPS 的发展背景，以及对第三代新型民用信号L5的要求。然后介绍了GPS信号的组成与L1信号和L5信号的结构，分析比较两个信号的差异。接着，介绍了L1信号的捕获跟踪算法并在GPS C/A码跟踪的基础上给出了L5信号的捕获跟踪算法。最后，分析了GPS L5信号进行定位解算后的结果。

关键词： L5信号,信号仿真,跟踪捕获,GPS接收机

THE SIMULATION OF L5 GPS SIGNAL AND THE DESIGN OF SOFTWARE RECEIVER

Abstract

With the development of the technology ,GPS has a growing impact on our lives .And now in different area ,such as voyage ,aviation ,communication ,traffic mapping ,weather reporting and resource exploration ,GPS takes an important role .For the increasing requirement of the precision ,the American government submit a plan of GPS modernization .To the civil use ,the improvement of the precision is mainly in the adding of the L2C and L5 signal .It makes the users observe more accurate .Based on this ,this paper make research on the simulation ,acquisition ,tracking of the GPS L5 signal as well as verifying it on matlab .

This paper investigates on the GPS L1 and L5 signal :First ,this paper introduce the back grounding of the GPS development and requirement of the L5 signal .Then introduce the structure of the GPS signal and analysis the difference .Thirdly ,this paper introduces the tracking and acquiring algorithm of the L1 signal ,and based on it ,provide the tracking and acquiring algorithm of the L5 signal .At last ,this paper analysis the result of the tracking result of the L5 signal.

KEY WORDS: L5 signal ,signal simulating, acquirement and tracking, GPS receiver

目 录

摘要··············································································I

Abstract·········································································II

第一章 绪论·····································································1

1.1GPS的发展及现代化计划·················································1

1.2GPS L5信号的设计需求···················································2

1.3本论文的结构和框架·····················································3

第二章 GPSL5信号及软件接收机设计 ··········································4

2. 1GPS 信号结构···························································5

2.1.1L1信号····························································5

2.1.2L5信号结构························································5

2.1.3伪噪声码··························································7

2.1.4数据码·····························································7

2.2 L5频段上GPS民用中频信号的调制······································8

2.2.1Neuman-Hoffman码（NH码）······································8

2.2.2循环冗余校验码(CRC) ············································8

2.2.3QBSK信号的调制原理·············································9

2.2.4L5信号的调制仿真·················································9

第三章 GPS信号的捕获跟踪原理···············································12

3.1并行频率搜索···························································14

3.2并行码相位搜索·························································14

第四章 实验结果及分析·························································17

4.1GPS L5信号仿真························································17

4.2GPS L5捕获跟踪代码及结果分析········································22第五章 总结与展望·····························································26

致谢············································································38

参考文献（References）···························································29

第一章 绪 论

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