结合盲源分离的非直单线阵多目标左右舷分辨  

A multi-target port/starboard discrimination algorithm for the non-straight single line array based on blind source separation

作　　者：李康宁 郭永刚[1] 张波 林鹏[1] LI Kangning;GUO Yonggang;ZHANG Bo;LIN Peng(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》2021年第6期905-912,共8页Acta Acustica

基　　金：国家自然科学基金项目(11974017,11874061);中国科学院青年创新促进会项目(2017028);中国科学院声学研究所青年英才计划项目(QNYC201742)资助。

摘　　要：针对单线阵左右舷模糊问题,提出了结合盲源分离的非直单线阵多目标左右舷分辨算法。该算法首先通过离散傅里叶变换将阵列接收信号离散化为若干个窄带频谱分量,之后对每个频点的窄带数据讲行盲源分离,得到每个频点上各个来波信号的导向向量;然后通过常规波束形成对各个导向向量进行方位谱估计,并根据左右舷抑制比进行单目标左右舷分辨,确定各个频点上的来波方向;最后对所有频点上的来波方向进行聚类,得到各个真实目标的方位,从而实现多目标左右舷分辨。仿真实验中,相比常规波束形成方法(CBF)和最小方差无畸变响应算法(MVDR),该算法更准确地估计出了目标数目,且保持了较快的计算速度;海试数据处理中,该算法排除了目标镜像的干扰,准确估计出了船只目标的轨迹。仿真及海试数据处理均表明,该算法可以分辨真实目标与目标镜像,具有比CBF和MVDR算法更好的左右舷分辨能力。To deal with the port/starboard ambiguity of the single line array,we proposed the multi-target port/starboard discrimination algorithm of the non-straight single line array based on blind source separation.According to this algorithm,first the array received signals are discretized into some narrowband spectral components through Discrete Fourier Transform.Then blind source separation is performed on the narrow-band data to get the steering vector of each incoming wave in every frequency bin.After that,the direction spectrum of each steering vector is estimated by the Conventional BeamForming(CBF) method.With the port/starboard restrain ratio,we can realize one-target port/starboard discrimination and find the azimuths of real targets at the corresponding frequency bin.Finally all azimuths are clustered to get the azimuth of each target.As a result,multi-target port/starboard discrimination is achieved.In simulation,this algorithm estimates the number of targets more accurately than CBF and Minimum Variance Distortionless Response(MVDR) algorithm,and at the same time maintains a fast operation speed.In sea trial data processing,this algorithm eliminates the interference of mirror targets and accurately estimates the tracks of ship targets.Both simulations and experiments demonstrate that the proposed algorithm can discriminate real targets and mirror targets,outperforming CBF and MVDR algorithm in multi-target port/starboard discrimination.

关 键 词：最小方差无畸变响应 离散傅里叶变换 盲源分离 MVDR算法 来波方向 频谱分量 谱估计 数据处理 

分 类 号：TB56[交通运输工程—水声工程]