改进的GPS弱信号差分捕获方法研究  

An Improved Differential Acquisition Algorithm for GPS Weak Signals

作　　者：裘勋[1] 卢艳娥[1] 庞春雷[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《现代防御技术》2011年第6期126-130,共5页Modern Defence Technology

基　　金：国家自然科学基金(61071014);学院科研创新基金(DYCX1002)

摘　　要：捕获是GPS接收机信号处理中的关键部分,在微弱信号情况下,传统的弱信号捕获方法不能很好地捕获到卫星信号,采用一种改进的GPS弱信号差分捕获方法来进行捕获研究。并对一组GPS的数据信息,分别采用以上2种方法对其进行捕获仿真。结果显示,新方法可以捕获到较微弱的GPS信号,提高了接收机的灵敏度。Signal acquisition is the key phase of GPS signal processing. Sometimes, GPS signals are too weak to be received or processed by traditional methods for weak signals. An improved differential ac- quisition method for weak signals is presented here. A data set collected is used to verify the algorithm, and the result shows that the improved method can capture the GPS weak signal successfully and improve the sensitivity of receivers.

关 键 词：GPS软件接收机 相干积分 差分相干 

分 类 号：P228.4[天文地球—大地测量学与测量工程] TP391.9[天文地球—测绘科学与技术]