基于Gammatone听觉滤波器组的水中目标线谱检测方法

Line spectrum detection method of underwater target based on Gammatone auditory filter bank

针对水中目标线谱信号信噪比较低的问题,提出Gammatone听觉滤波器组的水中目标线谱检测方法。利用人耳耳蜗具有良好的分频特性和尖锐的滤波特性的特点,对水中目标线谱信号进行分频处理;同时,结合水中目标线谱信号相位稳定度较高的特点,对分频后的信号进行相位标准差加权处理,给出了该方法的检测性能。从仿真和岸基激光干涉仪实验结果可以看出:提出的方法可以检测出低信噪比下的线谱信号。从检测概率结果来看,当信噪比为-7dB时,提出方法的检测概率为1,高于常规快速傅里叶变换(FFT)方法的检测概率。所提出的方法为低信噪比下水中目标线谱检测提供了一种新的思路。

Aiming at the problem of the low signal-to-noise ratio(SNR)of underwater target line spectrum signal,underwater target line spectrum detection method based on Gammatone auditory filter bank is proposed.Because the cochlear has good the characteristics of frequency division and sharp filtering,the Gammatone auditory filter bank is used to divide the line spectrum signal to different channels,at the same time,according to the feature that the phase of line spectrum signal changes more relatively steady than that of noise spectrum in each channel,the frequency spectrum of each channel is weighted by the standard deviation of phase,and the detection performance of the method is given.The simulation and shore-based laser interferometer experimental results showed that the proposed method can detect the line spectrum signal at low SNR.The detection probability showed that it is 1 when SNR is-7 dB,which is higher than that of the conventional fast Fourier transform(FFT).The proposed method provides a new way to detect and distinguish line spectrum signal.