矢量水听器通道相位不一致对前向干扰抑制的影响及改进

Influence and Improvement of Vector Hydrophone Channel Phase Inconsistency on Forward Interference Suppression

矢量水听器可共点同步独立测得空间一点处的声压和质点振速正交分量,单个矢量水听器即可通过对各通道信号采用不同的加权系数组合处理,获得不同的指向性。当形成单边心形指向性时,可实现前向干扰抑制;当各通道相位差不一致时,其前向干扰抑制能力降低。针对这一问题,通过仿真和试验,验证了各通道相位差不一致对矢量水听器心形指向性零陷深度的影响,并提出采用FFT计算通道间的初始相位差进行相位补偿,以降低各通道相位不一致对前向抑制能力的影响。仿真和试验验证了该方法的可行性。

The vector hydrophone can synchronously and independently measure the orthogonal components of sound pressure and particle vibration velocity at a point in space,and a single vector hydrophone can form different directivity by combining different weight coefficients.Forward interference suppression can be achieved when unilateral cardioid polar directivity is formed.However,when the phase of each channel is inconsistent,the capability of forward interference suppression will be greatly affected.To solve this problem,the influence of phase inconsistency on the zero depth of cardioid directivity of vector hydrophone is verified by simulation and experiment,and a method of phase compensation using FFT to calculate the initial phase difference is proposed to reduce the influence of phase inconsistency on the measurement results.The feasibility of the proposed method is verified by simulation and experiment.