瞬时相关积分法在矢量水听器方位估计中的应用研究

Application of instantaneous correlation integral method in azimuth estimation of vector hydrophone

矢量水听器可以同轴共点的测量声场信息,单个水听器即可完成对目标方位的无偏估计,但在各通道的相位不一致时,其估计精度会受到很大影响。针对这一问题,提出了将瞬时相关积分作为预处理算法的解决办法。各通道的信号在经过瞬时相关积分后,其相位保持了一致,并且输入信号的信噪比也得到了有效提高,从而可以保证对目标方位的有效估计。理论分析与仿真实验验证了算法的有效性。

The vector hydrophone can measure the sound field information coaxially and concurrently. Since the single vector hydrophone can accomplish the unbiased estimation of target azimuth,the inconsistent phase of each channel will greatly affect on the estimation precision. To solve this problem,the solution of using the instantaneous correlation integral as the preprocessing algorithm is proposed. The phase of each channel is consistent after signal′s instantaneous correlation integral,and the signal-to-noise ratio（SNR）of the input signal is improved to guarantee the effective estimation of target azimuth. The effectiveness of this algorithm is verified by theoretical analysis and simulation experiment.