摘要
在分析基于软件无线电全球定位系统(GPS)接收机结构的基础上,研究了GPS单频软件接收机的捕获和跟踪算法,并基于MATLAB平台在PC上仿真了GPS单频软件接收机样机。信号捕获采用基于快速傅里叶变换(FFT)的并行码相位搜捕算法;信号跟踪联合使用超前滞后非相干延迟锁定环和科斯塔斯环的跟踪环结构。采用实测数据对信号捕获、跟踪算法进行了分析和验证。结果表明:仿真的GPS单频软件接收机具备基本的基带信号处理功能。
With the simple analysis of the GPS receiver＇s architecture and software definition radio,acquisition and tracking algorithms for a single frequency GPS software receiver were studied,also a prototype that runs on PC was developed based on MATLAB platform.A parallel code phase search acquisition algorithm based on FFT was used to capture the satellite signals,and early-later code tracking loop and Costas phase lock loop were used to track code phase and Doppler frequency shift,respectively.Based on GPS intermediate frequency domain real data,the analysis and verification of signal acquisition and track algorithms were given.Experiments show that the simulated GPS single frequency software receiver has fundamental functions of baseband signal processing.
出处
《全球定位系统》
2011年第5期22-25,30,共5页
Gnss World of China
基金
重庆市科技攻关计划项目(CSTC
2009AC2032CSTC
2010AC2037)
国家科技人员服务企业项目(2009GJF10032)
关键词
GPS软件接收机
捕获
跟踪
快速傅里叶变换
GPS software receiver
acquisition
tracking
Fast Fourier Transform（FFT）
