用于被动声纳宽带目标检测的多水听器互相关方法

为了有效地解决在低信噪比下宽带目标的被动声纳检测问题，本文将传统的用于声源定位的双水听器互相关方法扩展为多水听器互相关方法，通过多个水听器的输出信号的相干累加实现了在接收端的信噪比的提升。首先使用宽带滤波，计算得到各个水听器关于假定声源位置的信道解调信号，其次计算两组水听器的输出累加信号的时域互相关，最后对时域互相关进行阈值检测。仿真结果表明，相比于双水听器，多水听器互相关方法能够在更低信噪比下实现宽带目标检测。此外，考虑到求解滤波器系数需要很大的计算量，本文提出了运用互易性原理的加速方案。仿真结果表明互易性原理可以有效地降低求解滤波器系数的计算量。 

Multi-Hydrophone Correlation Method for Passive Sonar Broadband Target Detection

To effectively solve the problem of passive sonar detection of broadband targets in low signal-to-noise ratio, the traditional dual-hydrophone correlation method for sound source localization is expanded into a multi-hydrophone correlation method, and the coherent accumulation of the output signals realizes the improvement of the signal-to-noise ratio at the receiving end. First, broadband filtering is used to calculate the channel demodulation signal of each hydrophone about the assumed sound source location. Second, the time-domain correlation of the accumulated signals of the two sets of hydrophones is calculated, and finally the time-domain correlation is thresholded. Simulation results show that, compared with dual hydrophones, the multi-hydrophone correlation method can achieve broadband target detection at a lower signal-to-noise ratio. In addition, considering that the calculation of filter coefficients requires a lot of calculations, an acceleration scheme using the principle of reciprocity is proposed. The simulation results show that the principle of reciprocity can effectively reduce the calculation of filter coefficients.