GPS软件接收机高精度定位和测速的研究与实现  

Realization of Accurate Positioning and Velocity Measuring Based on GPS Software Receiver

作　　者：孙希延[1] 纪元法[1] 施浒立[1] 李迎春[2] 

机构地区：[1]中国科学院国家天文台 [2]北京理工大学,北京100081

出　　处：《武汉理工大学学报（交通科学与工程版）》2008年第4期623-626,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家973计划项目资助(批准号:2007CB815500)

摘　　要：在GPS软件接收机架构下,基于MATLAB软件平台,分析了捕获和跟踪方法.提出了一种仅利用采样数据计算伪距,并实现较高定位精度的方法.不直接测量某个历元的多普勒频移,而是测量在某一时间间隔内的多普勒频移之间的多普勒计数,实现高精度的测速.利用实际采集的GPS中频信号,通过仿真实验,实现了高精度定位和测速功能.实验结果表明,利用实际采集得到的GPS中频数据,在GPS软件接收机架构下,完成GPS全部基带信号处理以及定位和测速等,完整实现了一个接收机的功能.A GPS software receiver is developed using real GPS intermediate frequency samples based on MATLAB. Methods of acquisition and tracking are carefully investigated. A method is introduced to calculate pseudo range only based on the sampling frequency information. Positioning is realized with these pseudo ranges. Velocity of receiver is measured with Doppler counters in some time not with Doppler frequency bins at an epoch. An experiment is carried out using real GPS intermediate frequen- cy samples. As a result, accurate positioning and velocity measuring are realized. Experimental resuits show that GPS software receiver could accomplish all base band signal processing, positioning, velocity measuring and so on. All functions of a common GPS receiver are realized.

关 键 词：GPS软件接收机FFT捕获 跟踪 多普勒计数 

分 类 号：TN927[电子电信—通信与信息系统]