四分之一波长间距阵抗拖船干扰研究

Research on anti towing ship interference with quarter wavelength interval array

为改善拖曳线列阵声呐的尾向探测能力,降低拖船噪声对半波长间距阵尾向探测性能的制约,本文关注四分之一波长间距阵对连续波信号和带限噪声的响应。研究表明,四分之一波长间距阵具有非对称的端向指向性,与半波长间距阵相比有约20 d B的空间抑制能力,能有效抑制拖船辐射噪声干扰。本文还提出用零陷权组合传感器构成四分之一波长间距阵,理论上其抗拖船噪声干扰的效果比四分之一波长间距阵更好。

There are a lot of published studies which discuss the anti-interference problem in the noise background radiated by a towing ship based on the array with an interval of 1/2 wavelength between elements. Not the 1/2 wavelength interval one but the 1/4 wavelength interval one is to be concerned because of the obvious benefit to detecting signal in the noise background radiated by towing ship. Research shows that the end fire directivity of the array with an interval of 1/4 wavelength between elements is not symmetric, which can suppress tow-ship interference effectively. And, the combined sensors with null beam pattern are proposed as elements to form the 1/4 wavelength interval array, with which the detection ability in the tail direction can be improved more significantly.