一种用于微弱GPS信号处理的快速捕获方法  

A Rapid Acquisition Method for Weak GPS Signal Processing

作　　者：林庆恩[1] 茅旭初[1] 

机构地区：[1]上海交通大学仪器科学与工程系,上海200240

出　　处：《计算机仿真》2010年第10期330-334,共5页Computer Simulation

基　　金：国家自然科学基金(40674002)

摘　　要：微弱GPS信号的捕获处理将使运算量急剧增加,传统的方法难以实现快速捕获以保证信号处理的实时性。针对解决捕获微弱信号问题,根据GPS的C/A码本身的相关特性和计算机基本运算的时间特性,提出了一种改进的快速串行搜索和FFT搜索捕获方法,在同等精度下,大量减少运算量,提高捕获速度,保证了高灵敏度GPS软件接收机的实时性。仿真结果表明,对不同载噪比的GPS中频信号数据应用改进的串行搜索捕获法可以节省时间近40%,满足微弱GPS信号的快速捕获要求,为设计提供了依据。It＇s difficult to acquire weak GPS signal rapidly by traditional methods and eventually loses real-time capability of weak signal processing,because of dramatic increase in computational complexity.This paper presented a new rapid acquisition method to solve this critical problem based on C/A code＇s own correlation characteristics and time characteristics of basic computer operations.With the same precision,this method can improve the speed of computation and reduce the time of computation greatly,to ensure the real-time of the high sensitivity GPS software receiver.The experimental results show that,proposed method can save nearly 40% time of computation,while ensuring the rapid acquisition of weak GPS signal.

关 键 词：全球定位系统 快速捕获 串行搜索 快速福里哀变换搜索 微弱信号处理 

分 类 号：TN967.1[电子电信—信号与信息处理]