GPS软件接收机中微弱信号捕获算法研究  

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

作　　者：李建伟[1] 严丽云[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《电子测试》2011年第1期36-41,57,共7页Electronic Test

摘　　要：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,在传统的相干积分和非相干积分的捕获方法的基础上,本文采用了一种基于"块处理"与差分相干积分相结合的弱信号捕获方法,并将其与传统的相干积分结合非相干积分的捕获方法进行了比较,通过仿真分析证明,这种信号捕获算法具有更强的信号检测能力。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.

关 键 词：微弱信号 捕获方法 相干积分 

分 类 号：P228.4[天文地球—大地测量学与测量工程]