Nested阵列宽带LFM信号二维DOA估计  

Two-dimensional DOA estimation for wideband LFM signals based on Nested arrays

作　　者：李小琳 张文俊[1] LI Xiaolin;ZHANG Wenjun(School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China;Shanghai Electro-Mechanical Engineering Institute,Shanghai 201109,China)

机构地区：[1]上海大学通信与信息工程学院,上海200444 [2]上海机电工程研究所,上海201109

出　　处：《上海大学学报（自然科学版）》2020年第4期506-517,共12页Journal of Shanghai University:Natural Science Edition

摘　　要：Nested阵列以其大阵列孔径和更多自由度的优点,成为近期研究的热点。但大多集中在对窄带、平稳信号的波达方向(direction-of-arrival,DOA)估计,针对宽带信号,特别是非平稳宽带信号的研究较少。本工作基于分数阶傅里叶变换,应用DOA矩阵方法,提出一种Nested阵列二维测角算法,不需进行二维非线性搜索和参数配对,可实现对宽带线性调频信号的空间波达角精确估计。仿真结果验证了该算法的优越性。Nested arrays have garnered significant interest owing to their large array apertures and more degrees of freedom.However,most studies have been focused on directionof-arrival(DOA)estimation of narrow-band and stationary signals.Few studies have been conducted on wide-band signals,particularly nonstationary wide-band signals.In this paper,based on fractional Fourier transform and DOA matrix method,a two-dimensional angle measurement algorithm of nested array is proposed to accurately estimate the spatial DOA of wide-band linear-frequency-modulation signals without two-dimensional nonlinear search and parameter pairing.Simulation results confirm the superiority of the new algorithm.

关 键 词：Nested阵列 分数阶傅里叶变换 矩阵法 宽带 波达方向估计 

分 类 号：TN911.7[电子电信—通信与信息系统]