GPS软件接收机信号快速捕获新方法  

High Sensitivity Fast Acquisition Algorithm for GPS Software Receiver Signal

作　　者：顾建华[1] 严国军[1] 杨久东 GU Jian-hua;YAN Guo-jun;YANG Jiu-dong(Yancheng Industry Vocational & Technical College,Yancheng 224000,China;School of Mining Engineering North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]盐城工业职业技术学院,江苏盐城224000 [2]华北理工大学矿业工程学院,河北唐山063210

出　　处：《火力与指挥控制》2019年第6期67-71,共5页Fire Control & Command Control

基　　金：国家自然科学基金资助项目(41574072)

摘　　要：针对微弱信号条件下GPS软件接收机的C/A码捕获问题,提出一种新的并行快速捕获算法。采用平均相关技术降低C/A码的自相关损耗,基于载频误差补偿技术减小C/A码累积误差;利用叠加相关方法降低相干累积运算的复杂度,通过循环移位减小频率步进搜索的时间消耗。实验结果表明该算法能够有效实现GPS信号捕获。对比仿真实验表明,该算法能够完成弱GPS信号捕获,且运算量适中,适合高灵敏度软件接收机使用。Aiming at the problem of C/A code acquisition of GPS software receiver under weak signal condition,a new parallel fast acquisition algorithm is proposed.Firstly,autocorrelation loss and accumulative error of C/A codes is reduced by average correlation technique and carrier frequency error compensation techniques,respectively.And then,the complexity of coherent cumulative operation is reduced using superposition correlation technique,the time-consuming of frequency stepping search is decreased by cyclic shift.Experimental results show that the algorithm can effectively capture GPS signals.Comparative simulation experiments show that the proposed algorithm could achieve weak GPS signal acquisition,and the computational is moderate and it is suitable for high sensitivity software receiver.

关 键 词：全球定位系统 信号捕获 高灵敏度 低复杂度 

分 类 号：TN911[电子电信—通信与信息系统]