一种全球定位系统弱信号捕获策略  

An acquisition strategy of Global Positioning System weak signal

作　　者：梁涛涛[1] 杨春[1] 吴军伟[1] 王明[1] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621999

出　　处：《太赫兹科学与电子信息学报》2014年第5期682-687,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：信号捕获是目前广泛应用的数字全球定位系统(GPS)接收机的重要部分,弱信号条件下的信号捕获过程是目前GPS接收机算法研究的重点。本文分析和比较了2种经典捕获检测策略(TONG捕获策略及NM捕获策略)的性能,并针对弱信号条件下GPS信号捕获的特点,提出了一种适用于弱信号条件下的捕获检测策略—双门限搜索检测策略。理论分析和仿真说明该策略在弱信号条件下具有较好的性能。Acquisition is a very important part of digital GPS receiver. The acquisition of weak GPS signal is a key point of the research of GPS algorithm. Two classic acquisition strategies, TONG strategy and NM strategy, are analyzed and compared. Considering the specialty of weak signal condition, a new acquisition strategy named Double Threshold(DT) strategy is proposed. The analysis and simulation indicate that it performs well under weak signal condition.

关 键 词：全球定位系统 信号捕获 弱信号 捕获策略 

分 类 号：P228.4[天文地球—大地测量学与测量工程]