GPS弱信号的半比特差分捕获算法

Half bits differential acquisition algorithm for GPS weak signals

针对微弱信号情况下,传统的信号捕获方法不能很好地捕获到卫星信号的问题,提出一种半比特差分捕获算法,用于实现对微弱GPS信号的捕获。同时与半比特交替算法进行了比较。通过对一组GPS数据信息的捕获仿真实验,比较捕获效果。结果显示,这种新算法可以捕获到微弱的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 GPS signals. Nowadays, differential coherent method as a new method for acquisition has been widely used. This paper presents a half bits differential acquisition algorithm for weak signals, and compares the algorithm with alternating half bits algorithm. A GPS data is used to simulate these algorithms, and make a comparison between them. The result shows that the new algorithm can capture the GPS weak signals successfully, and improve the sensitivity of receivers.