实时软件接收机伪码快速捕获技术  

AFast C/A Code Acquisition Technique for Real-time Software Receiver

作　　者：赵欣[1] 赵琳[1] 宋洪涛[1] 郝勇[1] 

机构地区：[1]哈尔滨工程大学自动化学院．哈尔滨150001

出　　处：《弹箭与制导学报》2009年第4期185-188,共4页Journal of Projectiles,Rockets,Missiles and Guidance

基　　金：国家自然科学基金(60474046)资助

摘　　要：为开发实时GPS软件接收机,文中首先分析了目前伪码并行捕获方法中系统复杂度和捕获速度之间的矛盾,设计了基于FFT的循环相关并行捕获算法。针对弱信号环境下低信噪比的情况,研究了适合该算法的解决方案,并提出改进的捕获算法,理论分析与实验结果证实了该方法在弱信号环境下具有较好的捕获性能,并能大幅度减少捕获时间。To develop a real-time GPS software receiver, this paper first anal sized the acquisition method at present and told its disadvantages. At the same time, the paper pointed out the contradiction between system complexity and acquisition speed for the common parallel-acquisition algorithms. To solve this problem, a circular correlation method based on FFT for C/A code acquisition was discussed. To improve SNR in weak signal environments, this text put forward a modified acquisition by circular correlation. The analysis and simulations indicate that the method can make the performance of acquisition in low SNR improved and verify its validity.

关 键 词：伪码捕获 FFT 循环相关 实时软件接收机 

分 类 号：TN966.2[电子电信—信号与信息处理]