基于频域符号相关的北斗信号捕获新算法  

Method for BDS Signal Based on Sign Correlation in Frequency Domain

作　　者：王嘉宁[1] 廉保旺[1] 吴鹏[1] Wang Jianing Lian Baowang Wu Peng(School of Electronics and Information, Northwestern Polytechnical University, Xi＇an 710072, China)

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《西北工业大学学报》2016年第5期867-873,共7页Journal of Northwestern Polytechnical University

基　　金：国家自然科学基金(61501430)资助

摘　　要：北斗导航信号中NH码会导致北斗导航信号的捕获概率降低和捕获时间的增加。为了实现对导航信号的快速捕获,在不进行码剥离的条件下提出了一种基于PMF-FFT结构的频域符号相关算法。该算法首先对接收到的北斗导航信号进行部分匹配滤波(PMF)和FFT,其次,对各个码相位对应PMF-FFT输出结果进行频域符号相关处理以消除符号跳变的影响,从而实现有符号跳变下,北斗导航信号的快速捕获。仿真结果表明,在相同的虚警概率和检测概率下,文中所提出的算法相对于PMFFFT算法和PMF非相关积分算法分别有1.8 d B和1.5 d B的灵敏度提升。Focusing on the problem of low acquisition probability and long acquisition time bought by NH code,under the condition of without NH code stripped,we propose a novel code acquisition algorithm based on PMF-FFT structure. Firstly,we obtained a set of frequency domain related vectors by PMF（ partial matched filter） and FFT transform.Then we performed frequency domain correlation with the PMF-FFT results and sign sequences to remove the NH code. The theoretical analysis and simulation results show that compared with the PMF-FFT and PMF-incoherent algorithms the proposed algorithm can effectively improve the detection sensitivity,under the same condition.

关 键 词：北斗信号 频域相关 捕获 PMF-FFT 

分 类 号：TP91[自动化与计算机技术]