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摘要GPS,也就是全球定位系统，其特点有：全天候工作，全球覆盖。目前，无论是在军事领域还是民用领域，GPS接收机的应用都越来越广泛，这给用户导航以及定位发挥着非常大的作用。随着新的卫星导航系统的不断发展以及GPS的逐步升级，跟传统的GPS接收机相比较，GPS软件接收机的灵活性高以及成本较低等优点越发突出。65543
本文的主要研究内容是GPS软件接收机的捕获与跟踪算法，并基于Matlab软件平台实现软件仿真。GPS软件接收机在Matlab环境下，对接收采样得到的GPS中频数字信号进行并行码相位搜索捕获，将捕获得到的码初始相位和载波频率传递给跟踪模块，对跟踪模块所得到的导航数据进行位同步处理，子帧同步处理和奇偶校验处理，然后就可以得到用于导航定位的数据。基于Matlab环境中，编写捕获程序、跟踪程序以及数据处理等程序，通过利用软件方式来实现GPS接收机导航定位。
毕业论文关键词：GPS、中频信号、MATLAB、捕获与跟踪、软件接收机
Abstract GPS, this is the global positioning system, its features are: all-weather work, global coverage. At present, both in military and civil fields, application of GPS receiver are more and more widely, which give the user navigation and positioning plays a very big role. With the gradual escalation of continuous development of new satellite navigation system and GPS, compared with the traditional GPS receiver, GPS software receiver of high flexibility and low cost becomes more and more prominent.
The main research contents of this paper are the GPS software receiver's acquisition and tracking algorithm, and software simulation software platform based on Matlab. GPS software receiver in the Matlab environment, parallel code phase search capture of GPS intermediate frequency digital signal receiving sampling, transmission will capture code initial phase and carrier frequency to the tracking module, bit synchronization, frame synchronization and parity check processing of navigation data tracking module output, extract GPS for ephemeris parameters of navigation and location. In the Matlab environment, prepared acquisition, tracking and data processing program, GPS receiver positioning of the user is realized by software method.
Key word：GPS, IF signal, MATLAB, acquisition and tracking, the software receiver
目录
1.绪论 1
1.1课题研究背景 1
1.2课题研究意义 1
2.GPS卫星的导航定位信号 3
2.1 GPS系统简介 3
2.2 载波 5
2.3 导航电文 6
2.3．1遥测码 7
2.3．2转换码 7
2.3．3第一数据块 8
2.3．4第二数据块 8
2.3．5数据块Ⅲ 8
2.4 伪随机噪声码 8
2.4.1易捕获码(C/A码) 10
2.4.2 精密测距码P(Y)码 11
2.5 直接序列PRN的产生 12
2.6 GPS 信号的产生 14
3.Matlab简介 15
4.中频GPS信号的捕获及软件实现 16
4.1基于FFT并行码相位搜索捕获 18
4.2中频GPS信号的捕获的Matlab仿真