The theory and model of auditory peripheral has made great progress,and has been widely used in speech signal processing. The text combined Gammatone filter and Meddis model to simulate processing mechanism of cochlear, and modified parameters of Meddis model according to the characteristics of underwater acoustic signals. Based on the Gammatone-Meddis auditory peripheral model,an approach to extract features from underwater target signal was presented. Then a twenty-three dimension feature vectors were obtained. With the feature vectors, the training and recognition processes was performed.The real sea experiments show that die features can classify effectively and the recognition ratio may arrive 94% above, that the features are robust and the capability of recognition does not decline when convolution noises are added to original signals. Finally, the experiments prove that both nonlinear selecting frequency by basement membrance and inner hair cells can restrain noise.%听觉外周的理论和建模已取得长足的发展,并已广泛应用于语音信号处理.本文集成Gammatone听觉滤波器和Meddis内毛细胞模型来模拟耳蜗的处理机制,并根据水中目标辐射噪声信号的特点对Meddis模型的参数进行了修正.提出基于Gammatone-Meddis听觉外周计算模型的水中目标特征提取方法,得到一个23维的特征向量.对大量海上实测数据的分析表明该特征具有以下优点:(1)分类识别效果好,对测试集识别率达到94％以上；(2)抗卷积噪声能力强,对原始信号加入卷积噪声,识别能力没有下降.最后通过实验证明基底膜对频率的非线性选取和内毛细胞都能够很好地抑制噪声.
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