基于均匀同心圆阵列的近场宽带信号DOA估计  

Near-field broadband signal DOA estimation based on uniform concentric circular array

作　　者：孟子健 陈海华[1,2] MENG Zi-jian;CHEN Hai-hua(College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China)

机构地区：[1]南开大学电子信息与光学工程学院,天津300350 [2]天津市光电传感器与传感网络技术重点实验室,天津300350

出　　处：《微电子学与计算机》2020年第8期10-15,共6页Microelectronics & Computer

基　　金：国家自然科学基金(61841108)。

摘　　要：本文提出了一种基于频率响应不变同心圆阵列(Uniform Concentric Circular Array, UCCA)的近场宽带信号源到达角(Direction-of-Arrival, DOA)估计方法.该方法的基本原理是利用离散傅里叶逆变换(IDFT)将接收信号转换至相位模式,然后利用近场补偿因子进行滤波,以修正近场效应带来的信号畸变.经近场修正后的各路相位模式信号还将配备一个有限长响应(FIR)滤波器,以达到阵列响应频率不变的特性.通过上述处理后的近场宽带阵列信号则具有频率不变远场阵列响应的特点,因而可借鉴远场窄带波束形成设计方法设计阵列响应.设计例子表明,相较于其它近场宽带阵列方法,本文基于UCCA近场宽带频率响应不变阵列的DOA估计在性能上有显著提高.This paper proposes a near-field broadband directional-of-arrival(DOA) estimation method using frequency-invariant uniform concentric circular array(UCCA). The principle of the method is to use inverse discrete Fourier transform(IDFT) to convert the received signal to phase mode signals, which are then multiplied by near-field compensation factors to rectify the signal distortion caused by the near-field effect. The resultant phase mode signals are then filtered by a series of finite impulse response(FIR) filters to get frequency invariant response of the array. The proposed near-field broadband UCCA is of frequency-invariant far-field response, which make it possible that the method of far-field narrowband DOA estimation method can be extended to the near-field broadband case. The design example shows that the DOA estimation using the proposed near-field frequency-invariant UCCA has a significant performance improvement over several other methods.

关 键 词：同心圆阵列 频率不变 近场 DOA 

分 类 号：TN929.5[电子电信—通信与信息系统]