基于二次编码的北斗信号二次捕获算法  

Twice Acquisition Algorithm of BDS Signal Based on the Secondary Code

作　　者：李灯熬[1] 牛文慧[1] 赵菊敏[1] 李帅[1] 刘金强[1] 

机构地区：[1]太原理工大学信息工程学院,山西太原030024

出　　处：《北京理工大学学报》2016年第3期289-294,307,共7页Transactions of Beijing Institute of Technology

基　　金：国家自然科学青年科学基金资助项目(61303207);山西省科学技术发展项目工业部分(20120321024-01);2012年山西省留学回国人员科技活动择优资助项目

摘　　要：针对恶劣环境中微弱北斗卫星导航系统(BeiDou navigation satellite system,BDS)信号捕获难度大的问题,结合北斗采用的二次编码与主码的分层结构,提出北斗信号二次捕获算法.在主码层面进行并行捕获,而后在整个二次编码周期上进行二次捕获,以去除二次编码对积分时间的限制延长积分时间,达到提高接收机灵敏度的目的.实验仿真证明该算法提高了捕获能力4dB,同时降低约30%的运算量.Due to the difficult to acquire weak BDS signals,a new algorithm was proposed which combined the hierarchical structure of main code with the secondary coding that adopted in BD.Firstly,a parallel capture was processed in the main code level,and then the secondary acquisition was practiced over the entire secondary coding cycle to wipe off the effect of the secondary coding on the integration time,and to improve the sensitivity of receiver.The experimental results show that the proposed method can improve the ability of signal acquiring and reduce the computational complexity.

关 键 词：BDS FFT 捕获 二次编码 

分 类 号：TN961[电子电信—信号与信息处理]