关键词: 干扰抑制, 拖船干扰, 拖线阵声纳, 弱目标检测

Abstract: When detecting distant targets, towed array sonar is severely interfered by tugboat noise, causing the target signal to be submerged in tugboat noise and unable to achieve effective detection. In response to the weak target detection problem caused by tugboat noise interference, this paper first models tugboat noise as near-field interference, constructs a near-field interference weighting matrix, and suppresses it before beamforming; Then, in response to the problem of inaccurate acquisition of distance and orientation information of tugboats, a robust near-field interference suppression weighting matrix was further designed, which can still suppress tugboat noise and detect submerged targets under parameter mismatch, improving the tolerance of parameter range. Both numerical simulation and sea trial data processing results show that compared with zero point constraints and interference blocking algorithms, the proposed method can reduce the background level of tugboat noise by more than 80 dB in the case of parameter mismatch, ensuring the purity of tugboat noise interference suppression, achieving weak target detection submerged in tugboat noise, and improving the weak target detection capability of towed array sonar.

Key words: interference suppression, tugboat interference, towed array sonar, weak target detection