为了解决水面和水下目标进行分类这一难题，本文从起伏特性的角度出发，对舰船辐射噪声进行特征提取。首先利用PM海浪谱模拟随机起伏界面，运用积分方程方法近似计算了海面起伏界面的散射强度，根据散射强度模拟信号幅度包络的变化规律，并基于信号的物理特征和幅度包络的特征设计了相关器。这样对接收到的信号进行包络提取，并将提取到的包络通过相关器处理得到相关系数，最后根据对相关系数的判断实现对水面和水下目标的分类。本文测试了不同深度下的声源，仿真结果验证了根据相关系数判断水面水下目标是可行的，并通过实验数据进一步验证了算法的有效性。
In order to solve the problem of classification of water surface and underwater targets, this paper extracts the characteristics of ship radiation noise from the perspective of undulating characteristics.Firstly, the random undulation interface is simulated by PM wave spectrum, and the scattering intensity of the sea surface undulation interface is approximated by the integral equation method. According to the variation law of the amplitude envelope of the scattering intensity analog signal, the correlator is designed based on the physical characteristics of the signal and the characteristics of the amplitude envelope. In this way, the received signal is extracted by the envelope, and the extracted envelope is processed by the correlator to obtain the correlation coefficient. Finally, the classification of the water surface and the underwater target is realized according to the judgment of the correlation coefficient. In this paper, the sound sources at different depths are tested. The simulation results verify that the underwater target is feasible according to the correlation coefficient, and the effectiveness of the algorithm is further verified by experimental data.
2019,41(9): 115-120 收稿日期：2019-03-21
DOI：10.3404/j.issn.1672-7649.2019.09.022
分类号：O429
作者简介：张闻龙(1995-),男,硕士研究生,研究方向为水声信号处理
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