GPS软件接收机中微弱信号捕获算法研究

信号捕获的目的是确定接收机当前所在位置的可见卫星号,进而计算可见卫星的载波频率和伪随机码相位信息.目前随着GPS接收机应用的日益广泛,如何在弱信号环境下实现定位的问题日益突出.普通的GPS接收机不能捕获和跟踪到导航卫星信号,只能设法提高GPS接收机的灵敏度来实现导航和定位.为了解决微弱信号情况下的GPS信号捕获问题,在...

Research on an acquisition algorithm of weak signal in GPS software receiver

The purpose of signal capture is to determine the current location visible satellites numbers of the signal receiver, then calculate carrier frequency and PN code phase information. Currently with the increasing widespread application of the GPS receiver , How to achieve location in weak environments becoming a problem. The ordinary GPS receivers can’t capture and track the navigation satellite signals, can only to improve the sensitivity of GPS receiver to achieve the navigation and positioning. In order to solve the case of weak signal GPS signal acquisition problem, the coherent integration of traditional and non-coherent integration method based on the capture .This paper adopts new acquisition algorithm of weak signal based on block processing and differentially coherent . The simulation of signal acquisition analysis indicates the acquisition algorithm in this paper can achieve better detection capability.