基于延时相乘和同步数据块累加的GPS捕获算法  

Delaying with Multiplying and Synchronous Data Block Accumulating-based Algorithm for GPS Signal Acquisition

作　　者：陈科 王仕成[1] 赵欣 刘志国[1] 罗大成[1] 

机构地区：[1]西安第二炮兵工程大学,西安710025

出　　处：《科学技术与工程》2012年第36期9845-9850,共6页Science Technology and Engineering

基　　金：国家"863"课题项目(2011AA7050316)资助

摘　　要：对弱信号条件下的捕获技术进行研究。针对延时相乘法当噪声较大时难以捕获到信号,而同步数据块累加需要载波调整信号,结合二者各自的优点提出了一种新的捕获算法。先进行延时相乘,既去除了频率信息,将二维搜索过程转化为两个一维搜索过程;又巧妙的解决了同步数据块累加法存在的问题,达到了载波相位同步。仿真结果表明,该方法能够捕获到信噪比低至-25 dB的GPS信号。Capturing technology under conditions of weak signal was studied. It is difficult to capture signal for the delaying with multiplying algorithm when the noisy is big, and synchronous data block accumulating algorithm needs the help of carrier adjustment signal. A new acqusition method by combining they respective advantages is presented. At first, delaying with multiplying process not only remove frequency information, turning the two-di- mensional search process into two one-dimensional search process, but also solve the problem of synchronous data block accumulating method, achieving the carrier phase synchronization. The simulation results show that GPS sig- nal with SNR（ Signal to Noise Ratio） down to -25 dB can be acquired by the method.

关 键 词：弱信号处理 延时相乘法 同步数据块累加法 捕获 

分 类 号：TN967.1[电子电信—信号与信息处理]