一种新的BOC(n,n)型信号的精确捕获算法  

Novel unambiguous acquisition algorithm of BOC(n,n)signal

作　　者：陈适[1] 张天骐[1] 周圣[1] 易琛[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《计算机应用研究》2013年第3期672-675,681,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61071196;61102131);国家教育部新世纪优秀人才支持计划项目(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金项目(CSTC2011jjjq40002);重庆市自然科学基金资助项目(CSTC2009BB2287;CSTC2010BB2398;CSTC2010BB2409;CSTC2010BB2411)

摘　　要：针对BOC(n,n)型信号自相关函数存在三个峰值导致伪码捕获模糊性的问题,提出了一种新的基于相关函数的精确无模糊的捕获算法。该算法将信号进行频域的多普勒补偿,通过本地增设QBOC(n,n)支路,利用BOC(n,n)信号自相关以及BOC(n,n)和QBOC(n,n)互相关,经移位±TC/4、取模、求和、平方运算而实现。理论与仿真分析表明,该算法在不改变自相关主峰宽度的情况下完全消除相关副峰的同时,显著提高了主峰峰值;比传统捕获算法的性能好4.5 dB左右,并且捕获精度良好、易于实现。For the problem of ambiguous acquisition of BOC signal caused by its auto-correlation had three peaks for BOC （ n, n）, this paper presented a new accurate method which was based on correlation function. Firstly, it made the receiving signal Doppler compensation in frequency domain, and implemented the new algorithm by adding a local quadratic BOC（n,n） signal and using the result of BOC（n,n） signal auto-correlation and BOC（ n ,n） and QBOC（n,n） cross-correlation, after shifting ± Tc/4, modulus, summation, square. Theory and simulation results show that, the method does not only change the autocorre- lation peak width, completely eliminate the related side peaks at the same time, and significantly improve the peak, increases the probability of detection about 4.5 dB than traditional acquisition algorithm, but also the precision of capture are very good and easy to implement.

关 键 词：BOC(n n) 自相关 多普勒补偿 无模糊 捕获 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TP391.9[自动化与计算机技术—计算机科学与技术]