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.
作者
王嘉宁
廉保旺
吴鹏
Wang Jianing Lian Baowang Wu Peng(School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China)
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
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
关键词
北斗信号
频域相关
捕获
PMF-FFT
algorithms
Beidou navigation
frequency domain correlation
acquisition
PMF-FFT
作者简介
王嘉宁(1983-),西北工业大学博士研究生,主要从事卫星信号捕获研究。