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.
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
关键词
全球定位系统
信号捕获
弱信号
捕获策略
Global Positioning System
signal acquisition
weak signal
acquisition strategy
