基于均匀圆阵时频干涉仪的LFM信号二维测向算法  

2-D DOA estimation of LFM signals based on time-frequency interferometer and uniform circular array

作　　者：崔开博[1] 陈曦[1] 黄敬健[1] 袁乃昌[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《系统工程与电子技术》2017年第8期1669-1676,共8页Systems Engineering and Electronics

基　　金：国家自然科学基金(61302017)资助课题

摘　　要：提出了一种基于均匀圆阵时频干涉仪的线性调频(linear frequency modulation,LFM)信号二维波达方向估计算法。首先利用LFM信号时频聚集性非常好的特点,对阵元的输出进行互维格纳-威尔分布(WignerVille distribution,WVD)计算,然后提取互WVD时频冲激点的相位,从而得到包含信号到达角的方程组,解算出信号的到达角。通过选取不同的阵元对组,采用模糊数搜索的算法进行解模糊运算,最终完成信号到达角的估计,仿真实验验证了算法的有效性。Based on time-frequency interferometer of uniform circular array （UCA ） , a new 2-D direction of arrival （DOA ） estimation algorithm of linear frequency modulation （LFM ） signals is proposed. Firstly,good time-frequency concentration of LFM signals is used to calculate cross Wigner-Ville distribution （WVD ） of the elements output. Then , the time-frequency impulse point＇s phase of WVD results is extracted to get equations with DOA of the signal. The angles of the signal can be obtained by solving the equations. By selecting differ-ent element groups,the ambiguity can be solved using the algorithm of searching the ambiguity number. Final-ly, 2-D DOA estimation of LFM signals can be realized and the simulation results verify the effectiveness of the algorithm.

关 键 词：线性调频信号 时频分析 均匀圆阵 维格纳-威尔分布 时频冲激点 二维波达方向估计 解模糊 

分 类 号：TN971[电子电信—信号与信息处理]