频域盲源分离与波束形成结合抑制方向性强干扰方法

Suppressing directional interference combining frequency domain blind source separation with beamforming

针对方向性强干扰严重影响无源声呐弱目标检测的问题,提出了频域盲源分离与波束形成结合的干扰抑制方法:以子带分解的方法实现宽带干扰抑制。对每个子带进行频域盲源分离,并估计出各分离信号的方位,将与给定强干扰方位匹配的分离信号置零,利用估计的解混矩阵和处理后的分离信号重构回阵元域信号并进行波束形成实现目标方位估计。声呐模拟器数据与海试数据验证结果表明,相对于传统零陷常规波束形成与零陷最小方差无失真响应波束形成方法有2 dB以上的增益,约6 dB的背景级降低,证明该方法在抑制方向性强干扰方面是有效的。

Strong directional interference severely affects the weak targets detection capability of the passive sonar. In this paper, a method to suppress the strong directional interference combining blind source separation with beamforming is proposed. It uses the method of sub-band decomposition to realize the broadband interference suppression. The sub- band array signals are separated by the frequency domain blind source separation algorithm and the bearings of the separated signals are estimated. And if the bearings of the separated signals matching the corresponding signals are set to zeros. Then, it uses the estimated demixing matrixes and the separated signals which were clustered to reconstruct the array domain signal. Finally, the spatial power spectrum and targets bearings are estimated by the beamforming technology. Simulator and sea trial datasets are used to verify the proposed method, and the results show that the proposed method has two decibel gain and six decibel background decrease. It is proved to be effective in the aspects of strong directional interference suppression.