声圆阵模态域最小方差无畸变高分辨方位估计  

High-resolution direction-of-arrival estimation in modal space using minimum variance distortionless response based on circular array

作　　者：宋海岩[1] 唐弢[1] 迟凤阳 SONG Haiyan;TANG Tao;CHI Fengyang(School of Electrical and Information Engineering,Heilongjiang Institute of Technology,Harbin 150050,China)

机构地区：[1]黑龙江工程学院电气与信息工程学院,哈尔滨150050

出　　处：《黑龙江工程学院学报》2023年第6期1-6,共6页Journal of Heilongjiang Institute of Technology

基　　金：黑龙江省省属普通本科高校科研专项资金项目(2018CX11)。

摘　　要：空间目标方位估计是阵列信号处理研究领域的热点问题,广泛应用于国民经济及国防建设等众多领域。相较于传统均匀线列阵,圆阵在波束形状保持不变的条件下可提供360°全方位角估计。然而,现有大多数圆阵模态域方位估计方法均以电磁波为信号载体开展研究,很少讨论水下声场条件下如何建立圆阵模态域信号模型,同时,鲜有文献采用最小方差无畸变处理器进行圆阵模态域高分辨方位估计。鉴于此,文中以水下声波散射理论为基础,构建圆阵接收信号模型,利用模态域变换矩阵将阵元域接收数据转换为模态域信号,并将最小方差无畸变处理器引入圆阵模态域方位估计领域,提出一种基于声圆阵模态域的最小方差无畸变高分辨方位估计方法。计算机数值仿真结果表明,与传统波束形成方法相比,所提出的方法在单目标和双相干源目标环境下,均具有更尖锐的谱峰和更低的旁瓣水平,即较高的空间分辨能力和更精确的方位估计精度。In array signal processing,direction-of-arrival(DOA)estimation is a problem of interest in a variety of applications,including national economy and national defense construction and other fields.Compared to traditional linear array,uniform circular array(UCA)can provide 360°azimuthal coverage and can be steered to any direction in 2-D space without changing the shape of the pattern.However,most existing researches have primarily established the signal model from a electromagnetic wave perspective,seldom considering underwater acoustic circular array model.Furthermore,there are few literature that uses Minimum Variance Distortionless Response processor for high-resolution modal domain DOA estimation.In this paper,we construct the UCA signal model based on the acoustic scattering theory,then make use of the transforming matrix to form the array signal in modal space,finally introduce the Minimum Variance Distortionless Response(MVDR)processor into the DOA estimation domain and propose an high-resolution DOA estimation method in modal space using MVDR based on UCA.Computer numerical simulations illustrate that,compared to conventional beamforming,in the case of the single source and multiple coherent sources,the proposed method in this paper has sharper spatial spectrum and lower sidelobe,in other words,excellent resolution and higher DOA estimation accuracy.

关 键 词：均匀圆阵 方位估计 模态域 最小方差无畸变处理器 

分 类 号：TN911.7[电子电信—通信与信息系统] TB566[电子电信—信息与通信工程]