双耳低频高分辨快速精确定向算法

Binaural high resolution fast localization method for low frequency sources

小型被动探测节点由于成本低、布放简单等原因在水声领域应用广泛。已有的被动声测向技术在这种条件下存在定向精度低、角度分辨力差等缺点。为了解决小孔径基阵的目标快速精确定向问题及多目标分辨问题,将人类听觉系统对低频声源的定向过程与高精度时延估计算法相结合,提出双耳低频高分辨快速精确定向算法。通过理论分析和仿真与湖试数据的处理,证明算法对小孔径阵在低采样率的情况下可以对多个目标的方位进行快速精确估计,并可获得各目标的频率信息,利用频率的不同可以分辨相同方位入射的不同声源。

The small passive detection nodes are widely used in the underwater acoustic area due to low cost, easily emplacing and so on. The present passive localization techniques in this condition have the disadvantages of low accu racy, bad angle resolution etc. To solve the problems of fast accuracy target localization and multitarget resolution for small aperture array, this paper proposes a binaural high resolution fast localization method for low frequency sources based on combining the localization process of human audkory system for low frequency sound sources with high ac curacy timedelay estimation. By theoretical analysis and the processing of simulated data and lakeexperiment data, it is proved that this method can quickly and accurately estimate multitarget directions at low sampling frequency for small aperture array, and it can also get the frequency information of targets, which can be used to distinguish the different sources in the same direction.