BOC信号改进码相位捕获算法研究  

An Improved Code Phase Acquisition Algorithm for BOC Signal

作　　者：朱银兵[1] 李豹[1] 刘睿[1] 

机构地区：[1]海军工程大学电气工程学院,湖北武汉430033

出　　处：《武汉大学学报（信息科学版）》2015年第3期406-411,共6页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(41274013)~~

摘　　要：BOC(binary offset carrier)信号自相关函数存在多值性,BOC信号的捕获不能简单地移植GPS信号捕获算法。在分析经典并行码相位算法和BOC信号互相关特性基础上,仿真分析了并行码相位搜索算法对BOC信号进行捕获的有效性,并针对经典算法在低信噪比条件下捕获信号存在的不足,对经典算法进行了改进设计,并利用改进算法对多种BOC信号进行了仿真分析。结果表明,本文提出的改进捕获算法适用于BOC(pn,n)信号(p为整数),扩展了经典算法的适用范围,且与经典算法相比,改进捕获算法对所给定BOC信号能够改善捕获信噪比10dB,可显著提高接收机捕获灵敏度,对接收机BOC信号捕获算法设计具有重要意义。Auto correlation function results for a BOC signal show that it has multi-values, therefore the acquisition of a BOC signal can not simply transplant the algorithm of GPS signal. Thus, a parallel code phase search algorithm and the cross correlation characteristics of BOC signal are analyzed and the validity of parallel code phase search algorithm on BOC signal is simulated. An improved acquisi- tion algorithm is presented and used to analyze BOC signal, addressing the insufficiencies of the paral- lel code phase search algorithm for the acquisition of BOC signal at low SNR（signal to noise ratio）. The results show that the improved algorithm is fit for BOC（pn, n） signal where i0 is an integer, ex- panding the application area for parallel code phase search algorithms. The improved algorithm can improve SNR of acquisition 10 dB as compared to that of the parallel code phase search algorithm. The improved algorithm can enhance acquisition sensitivity of receivers, an important aid in the design of acquisition algorithms for receivers.

关 键 词：卫星导航 BOC调制 并行码相位搜索 

分 类 号：TN961[电子电信—信号与信息处理] P228.41[电子电信—信息与通信工程]