GPS卫星软件接收机算法研究
关键词GPS软件接收机捕获跟踪目次
Title Research on GPS satellite software receiver algorithms
Abstract
GPS is global positioning system, with global coverage, and work around
the clock. With the increasingly widespread use of the GPS application
areas, the performance of the GPS receiver a higher demand, the development
of a variety of high-performance GPS receiver to meet the user needs to
be an inevitable trend.In this paper, the basic theory of the GPS satellite
signals to deduce the GPS receiver software algorithm model to build a
software simulation platform to verify signal reception performance of the
algorithm.
GPS IF digital signal receiver simulation in Matlab as a platform for
research and simulation algorithm received under a real environment. The
paper first discussed in detail the content contained by the GPS signal
and system, and then in the capture portion of the parallel code phase (FFT)
search acquisition algorithm for GPS digital signal capture. In the
tracking part of the code tracking loop using non-coherent delay-locked
loop (DLLs), the carrier tracking loop using the Costar ring, and capture
the initial code phase and frequency to achieve a tracking signal. The
experimental results show that the receiver system is the basic realization
of the receiver performance, get the the pseudocode initial phase and
carrier frequency accuracy.
Keywords GPS receiver software acquisition tracking
1绪论..1
1.1研究背景..1
1.2研究目的及意义..1
1.3总体方案设计及论文结构安排..2
2GPS信号概述3
2.1GPS系统的组成..3
2.1.1空间星座部分.4
2.1.2地面监控部分.5
2.1.3用户设备部分.6
2.2GPS信号的组成..7
2.2.1载波7
2.2.2导航电文..8
2.2.3伪随机码.10
2.3GPS信号的产生.16
2.4本章小结17
3GPS信号的捕获及Matlab实现..17
3.1GPS信号捕获过程概述.17
3.1.1捕获时的最大电文长度.18
3.1.2.捕获中的频率步长..19
3.1.4本地信号产生20
3.2GPS信号捕获方法..20
3.2.1传统捕获方法20
3.2.2基于FFT算法的捕获方法..21
3.3GPS信号捕获Matlab仿真.23
3.3.1捕获算法研究23
3.3.2Matlab简介25
3.3.3仿真结果分析.26
3.4本章小结30
4GPS信号的跟踪及Matlab实现..30
4.1锁相环原理.30
4.2载波跟踪33
4.3码跟踪..35
4.4完整的跟踪环及Matlab仿真.37
4.4.1完整的跟踪模块.37
4.4.2仿真结果.38
4.5本章小结40
结论.41
致谢43
参考文献..44
1绪论
1.1研究背景
导航在人类历史的发展进程中一直起着相当重要的作用。1957年10月4日，