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提出一种从低频混响信号中提取简正波衰减系数的方法。利用简正波过滤技术对垂直阵混响信号进行分析,获得单阶简正波混响声场。假设海底反向散射矩阵可分离,从单阶简正波平均混响强度中提取出有效海底反向散射矩阵元素,最后利用不同距离上的有效海底反向散射矩阵元素计算出简正波的衰减系数。利用该方法从混响信号中提取出的简正波衰减系数预报的声传播损失和相同海域实测声传播损失一致。该简正波衰减系数提取方法有效避免了海底散射衰减和简正波传播衰减耦合的问题,同时对海底参数反演和水声环境的快速评估也具有重要的意义。
A method of extracting the normalized attenuation coefficient from the low frequency reverberation signal is proposed. The vertical array reverberation signal is analyzed by using the simple normal wave filtering technique to obtain single-order simple-wave reverberant sound field. Assuming that the subsea backscattering matrix is separable, the effective backscattering matrix elements are extracted from the single-order mean-square average reverberation intensities. Finally, the attenuation coefficients of the normalized waves are calculated using the elements of the effective subsea backscattering matrix at different distances. The acoustic propagation loss predicted by the simplified normal wave attenuation coefficient extracted from the reverberation signal by this method is consistent with the measured actual acoustic propagation loss in the same sea area. The method of extracting the normal wave attenuation coefficient effectively avoids the coupling problem of the seafloor scattering attenuation and the propagation of the simple-wave propagation, and is also of great significance for the inversion of the seafloor parameters and the rapid assessment of the underwater acoustic environment.