盲源分离与谱减法结合抑制方向性强干扰研究

Abstract

强目标干扰严重影响拖曳线列阵声纳的检测性能。本文提出了一种盲源分离与谱减法相结合的强目标干扰抑制方法。首先通过盲源分离和强目标干扰方位得到干扰在阵列上的响应，将其作为谱减法中的参考信号，主通道为阵列原始接收信号，经谱减后得到抑制干扰后的阵列信号，再采用波束形成方法完成目标的检测。仿真数据检验表明，该方法可较好地抑制方向性强干扰，明显提高了弱目标信号的空间谱能量，增强了拖曳线列阵声纳检测弱目标信号的能力。 Strong target interference severely affects the detection of the towed linear array. In order to solve this prob-lem, this paper presents a method which combines blind source separation (BSS) with spectrum subtraction. First, the interference response on the array is got by combining the BSS with the strong interference orientation. Then it is used as the reference channel of the spectrum subtraction and the main channel is the original array received signal. Finally, the target detection is completed by the beamforming. And it is tested by the simulation wideband data. Results show that this method can preferably cancel the directional strong interference. It obviously increases the spacial spectrum power of the faint target signal and improves the detection capability of the sonar system.