| GPS软件接收机的构建及其精频捕获算法的实现 |
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| 引用本文： | 祝雪芬,陈熙源,李滋刚.GPS软件接收机的构建及其精频捕获算法的实现[J].东南大学学报,2008,24(1):38-41. |
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| 作者姓名： | 祝雪芬 陈熙源 李滋刚 |
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| 作者单位： | 东南大学仪器科学与工程学院 南京210096 |
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| 基金项目： | 教育部新世纪优秀人才支持计划，Excellent Young Teacher Foundation of Southeast University |
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| 摘 要： | 介绍了一种GPS软件接收机的设计方法.该设计采用软件无线电设计理念,主要包括前端模块、捕获模块、跟踪模块、同步模块、导航解算模块以及其他辅助模块.捕获模块采用基于圆周相关的捕获算法,通过FFT(快速傅立叶变换)分别作用于输入信号和本地码信号将运算变换到频域内处理.该算法可得到C/A码起始相位和分辨率为1 kHz的载波频率信号,但此载波频率精细度差,不能直接用于跟踪环路.为提高载波频率分辨率,采用基于相位关系计算的精频估计算法.实验表明应用精频捕获算法得到的载波精频估计误差在几赫兹以内,可直接用于后续跟踪环路.
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| 关 键 词： | GPS软件接收机 捕获算法 圆周相关 精频估计 |
| 修稿时间： | 2007年5月25日 |
Architecture design of GPS software receiver and implementation of its acquisition algorithm with fine frequency estimation |
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| Zhu Xuefen,Chen Xiyuan,Li Zigang.Architecture design of GPS software receiver and implementation of its acquisition algorithm with fine frequency estimation[J].Journal of Southeast University(English Edition),2008,24(1):38-41. |
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| Authors: | Zhu Xuefen Chen Xiyuan Li Zigang |
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| Abstract: | The design of a global positioning system (GPS) software receiver is introduced.This design uses the concept of software radio,and it consists of the following parts:front-end,acquisition,tracking,synchronization,navigation solution and some assisting modules.In the acquisition module,the acquisition algorithm based on circular correlation is utilized.The input data and the local code are converted into the frequency domain by means of the fast Fourier transform(FFT).After performing circular correlation,the initial phase of the C/A code can be obtained and the carrier frequency can be found in 1 kHz frequency resolution,which is too coarse to use for the tracking loop.In order to improve the frequency resolution,the fine frequency estimation through a phase relationship is then achieved,by which,the frequency resolution is improved dramatically.Experiments show that the inaccuracy of the carrier frequency can be estimated within a few hertz by the fine frequency estimation method,and the fine frequency attained can be directly used for the tracking loop. |
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| Keywords: | GPS software receiver acquisition algorithm circular correlation fine frequency estimation |
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