多途环境下的单通道水声信号盲源分离

Single channel blind source separation for underwater acoustic signal under multipath condition

提出一种适用于多途环境下的单观测通道水声信号盲源分离方法。该方法首先利用自相关估计多途时延,使经各途径到达的多途信号同相叠加,信号能量得到增强,而噪声由于随机性能量不会增加,进而提高信噪比。然后采用间隔重采样的方法,虚拟多接收通道,解决单通道的欠定问题。仿真分析表明该方法可以有效解决多途环境下的舰船辐射噪声与环境噪声分离,而且在不同信噪比下有较稳定的分离性能。

A method of single channel blind source separation for underwater acoustic signal was proposed under condition of multipath transmission.Firstly,the multipath time delay was estimated with autocorrelation.Then,the successive multipath signals were added in phase,so as to increase the signal-noise ratio.At last,virtual channels were constructed with the observed data using resample method,the limitation of single channel was overcomed.The simulation results showed that the ship-radiated noise can be separated from ambient noise using this method with single observing channel under condition of multipath transmission,and the method works stably under different SNRs.