GPS基带信号处理方法综述

A Review on GPS Baseband Signal Processing Methods

全球定位系统(GPS)广泛应用于导航、测量、应急通讯等领域,近年来对GPS卫星基带信号捕获跟踪过程的研究日益深入,为此对捕获和跟踪算法进行系统的总结和对比。根据数字中频信号与本地信号混频后的处理方式将捕获算法主要分为相干捕获、非相干捕获和差分相干捕获等,根据跟踪环路功能将跟踪算法分为载波跟踪和码环路跟踪,分别对捕获和跟踪算法进行对比;归纳近几年捕获和跟踪的改进算法,分析其优缺点。最后展望捕获和跟踪算法的发展趋势。

Global Positioning System(GPS)is widely used in navigationmeasurementemergency communication and other fields.In recent yearsthe scholars are making increasingly intensive researches on acquisition and tracking process of GPS baseband signals.Thereforedifferent acquisition and tracking algorithms are systematically summarized for comparison.According to the processing mode after the mixing of digital Intermediate Frequency(IF)signals with local signalsthe acquisition algorithms can be mainly classified as coherent acquisitionincoherent acquisition and differential coherent acquisitionand a comparison is conducted.According to the function of tracking loopsthe tracking algorithms can be classified as carrier tracking and code loop trackingand a comparison is conducted.The improvements on those acquisition and tracking algorithms in recent years are summarizedand the advantages and disadvantages of the improved algorithms are analyzed.Finallythe prospect of baseband signal acquisition and tracking algorithms is given.