GPS软件接收机精确载波频率捕获算法分析与实现  

Research and Realization of Acquisition Algorithm with Fine Carrier Frequency Estimation of GPS Software Receiver

作　　者：刘宁 刘雪瑞 

机构地区：[1]61365部队

出　　处：《全球定位系统》2011年第2期36-39,共4页Gnss World of China

摘　　要：采用基于快速傅里叶变换(FFT)的并行码相位搜索捕获算法实现GPS信号的捕获,根据相位关系对载波频率进行精化,使其满足跟踪模块的需求。在分析算法的基础上,通过对模拟信号和实测数据进行捕获实验,实现了对载波频率的精化,获得精确频率可直接用于后续跟踪环路。The acquisition module is an important part of GPS software receiver. The parallel search and acquisition strategy of code-phase on the basis of FFT is utilized to implement GPS signals acquisition. In order to improve the frequency resolution to meet the need of the tracking loop, the fine estimation through a phase relationship is then achieved. Experiments using real and simulated IF data is showed, and the frequency resolution is improved dramatically, which can be directly used for the tracking loop.

关 键 词：FFT 并行 载波频率 相位 

分 类 号：P228.4[天文地球—大地测量学与测量工程]