BOC信号中一种新型的无模糊直接捕获算法  

An unambiguous and direct acquisition algorithm of BOC signal

作　　者：胡刚毅[1] 赵同林[1] 陈适[2] 钟丽辉[1] 

机构地区：[1]西南林业大学计算机与信息学院,云南昆明650224 [2]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电子技术应用》2013年第12期122-125,共4页Application of Electronic Technique

基　　金：云南省教育厅科学研究基金重点项目(2013Z084)

摘　　要：针对BOC调制信号自相关函数存在多个峰值和零点从而导致伪码捕获模糊性的问题,提出了一种重构相关函数与多普勒频域补偿相结合的捕获算法。该方法将信号进行频域内的多普勒补偿,然后利用BOC信号自相关函数的模以及BOC信号和PN序列互相关函数的模两者之和的特性,通过折叠进行重构,达到消除相关零点和提高主副峰值比的目的。不仅提高了检测概率,也降低了虚警概率。仿真分析表明,该算法与BOC自相关捕获算法相比,主副峰分离度有9.5 dB～16 dB的改善,主峰比例均值有1.2 dB～4.5 dB的改善,且捕获精度较高、易于实现。For the problem of ambiguous acquisition of BOC signal caused by its auto-correlation has more than one peak and null, a kind of new method which is based on reconstruction of correlation function and Doppler frequency domain compensa- tion is presented. Firstly, the receiving signal make Doppler compensation in frequency domain, and then use the characteristic of the BOC signal autoeorrelation function module and the BOC signal and the PN sequences cross-correlation function module, through simple fold reconstruction, to eliminate the zero point and improve the peak ratio of the main and auxiliary, whieh not only increases the probability of detection, but also reduces the probability of false alarm. The simulation results show that, compared to au- to-correlation acquisition algorithm, SAMS in this method has improved 9.5 dB to 16dB, and MMS has improved 1.2dB to 4.5 dB, also the precision of capture are good and easy to implement.

关 键 词：BOC信号 相关重构 多普勒频域补偿 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]