水平阵信号压缩感知用于简正波分离  

Normal mode separation based on compressive sensing with a horizontal array

作　　者：梁玉权 周士弘[1] 宫在晓[1] 戚聿波 牛海强 王域[1] LIANG Yuquan;ZHOU Shihong;GONG Zaixiao;QI Yubo;NIU Haiqiang;WANG Yu(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《声学学报》2020年第5期609-624,共16页Acta Acustica

基　　金：中国科学院前沿科学重点研究项目(QYZDY-SSW-SLH005);国家自然科学基金项目(11804362,11804364,11874061);中国科学院青年创新促进会项目资助。

摘　　要：针对水平阵信号简正波分离过程中常规波束形成分辨率低以及warping模态滤波不适用于复杂声信号的问题,提出水平阵信号压缩感知用于简正波分离的方法。利用压缩感知在方位估计中的高分辨特性,通过估计水平阵接收信号在频率方位角上的二维分布,分离得到各阶简正波的方位谱,并逆Fourier变换得到时域波形。仿真孔径1 km、阵元间隔10 m水平阵接收20~200 Hz伪随机声信号和脉冲声信号,所提方法分离出的各阶简正波与理论波形的相关系数在0.97~1.0。对2011年北黄海声学实验中的海底28元水平阵接收的气枪信号,在合成至1 km孔径后使用压缩感知方法分离简正波,其与warping模态滤波分离得的前5阶简正波相关系数在0.82~0.93。仿真与实验都说明了水平阵信号压缩感知简正波分离方法的有效性。According to the issue that traditional beamforming has low resolution and warping modal filtering is not applicable to arbitrary complex source signal,a normal mode separation method based on compressive sensing with a horizontal array is proposed.Taking advantage of compressive sensing,which has high resolution ability in azimuth estimation,normal modes can be separated in beam domain.That is to estimate the azimuth spectral distribution by compressive sensing,separate each normal mode on the plane of frequency and azimuth,and finally recover the waveform by inverse Fourier transformation.A pseudo-random as well as impulse sound source signal with bandwidth of 20-200 Hz is used to simulate sound field signal received by a horizontal linear array,whose aperture is 1 km and element space is10 m.And then apply the method proposed above to separate normal modes and compute the correlation coefficients with the theoretical ones.The correlation coefficient is between 0.97-1.0,which verify the compressive sensing normal mode separation method is applicable to any form of sound source signal.Experiment data of air-gun signals received by the seafloor-deployed 28 element horizontal line array at the North Yellow Sea in 2011,accompanied with synthetic aperture method to get a 1 km array,is used for compressive sensing normal mode separation.The correlation coefficient of the first 5 normal modes separated with warping filtering is between 0.82-0.93.Simulation and experiment verify the effectiveness of the proposed method.

关 键 词：压缩感知 FOURIER变换 方位估计 声信号 简正波 二维分布 脉冲声 常规波束形成 

分 类 号：O427[理学—声学]