东南大学学报（英文版）2008，Vol.24Issue(1)：38-41,4.
GPS软件接收机的构建及其精频捕获算法的实现
Architecture design of GPS software receiver and implementation of its acquisition algorithm with fine frequency estimation
摘要
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.关键词
GPS软件接收机/捕获算法/圆周相关/精频估计Key words
GPS software receiver/acquisition algorithm/circular correlation/fine frequency estimation分类
交通工程引用本文复制引用
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（英文版）,2008,24(1):38-41,4.基金项目
Program for New Century Excellent Talents in University(No.NCET-06-0462),Excellent Young Teacher Foundation of Southeast University(No.4022001002). （No.NCET-06-0462）
