拖线阵声纳的匹配场后置波束形成干扰抵消方法

根据拖曳线列阵对本舰噪声的接收响应机理，提出了一种用于本舰干扰抵消的新方法，即在现有后置波束形成干扰抵消器的基础上，利用本舰噪声在拖线阵上的拷贝场向量直接进行干扰波束形成，从而更好地达到消除本舰强干扰的目的。同时，还将匹配场干扰抵消方法推广应用于同方向强干扰背景下的弱目标检测问题。理论与仿真分析表明，匹配场PIC比基于平面波的PIC具有更好的干扰抑制性能。

A Novel Matched Field Postbeamformer Interference Canceller for Towed Line Array Sonar

According to the response of the towed linear array to the noise from the tow ship, a novel approach named MFPIC (Matched Field Postbeamformer Interference Canceller) is proposed to cancel this strong interference. Matched Field Processing (MFP) correlates the replica field and measured field, while MFPIC directly uses the replica field vector to generate interference beam. A distinct feature of the MFPIC is that it can suppress a noise source if the source-receiver geometry and the characteristics of the noise transmission channel are known a priori while the signal arriving from the same direction or in the vicinity of that direction can be completely preserved. For towed line array sonar system, MFPIC may provide significant improvement in tow-ship noise suppression, which in turn results in great performance enhancement, and particularly the dead zone of detection around the tow-ship direction can be eliminated. Experimental results based on simulated data for typical towed line array sonar have preliminarily verified the theory and shown great potential of the approach.