【摘要】 针对连续波主动声呐接收信号中强直达波干扰掩蔽弱目标回波的问题，传统干扰抑制方法的抑制能力无法满足直达波抑制的需求，本文依据直达波与目标回波在空域、时频域的特性差异性，提出一种时空联合的连续波直达波抑制方法，利用高阶导数展宽的近场修正波束零陷技术减少直达波所在一定方位范围内的能量，再通过分块处理的主分量反演技术分离残余直达波与目标回波，从而实现对强直达波干扰的有效抑制。在仿真条件下可使目标检测背景中的直达波干扰强度降低25 dB，在试验数据中可使目标检测背景中的直达波干扰强度降低15 dB。更多还原

【Abstract】 To address the issue of strong direct-wave interference masking weak target echoes in continuous-wave active sonar received signals, traditional interference suppression methods cannot meet the requirements for direct wave suppression. Based on the characteristic differences between direct waves and target echoes in the spatial domain and time-frequency domain, this paper proposes a space-time joint continuous wave direct wave suppression method. The method utilizes a near-field modified beam nulling technique based on high-order derivative broadening to reduce the energy within a certain azimuth range where the direct wave is located. Subsequently, a block-processing-based principal component inversion technique is employed to separate the residual direct wave from the target echo, thereby achieving effective suppression of the strong direct-wave interference. Under simulated conditions, it can reduce the direct wave interference intensity in the target detection background by 25 dB, while in experimental data, it can achieve a reduction of 15 dB.更多还原