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根据地声参数对不同声场物理量影响不同,提出了一种利用简正波频散特征结合声传播损失反演地声参数的联合反演方法。首先,考虑到简正波的频散特性(群速度)对海底的密度和声速较为敏感,而对海底吸收系数不敏感,利用自适应时频分析方法,获得不同频率不同号数简正波的到达时间差,以此作为代价函数,采用全局优化算法,反演出海底密度和海底声速的分层结构,并用概率统计的方法评价反演结果的有效性。反演出海底密度和声速后,利用实验船辐射噪声得到随距离连续的声传播损失来反演出海底吸收系数。最后,把反演的参数很好的用于声源匹配定位验证了反演结果的有效性。
According to the different influence of the acoustic parameters on the physical quantities of different acoustic fields, a joint inversion method using the acoustic wave dispersion characteristics of the normal acoustic wave and the acoustic parameters of the inversion of acoustic propagation losses is proposed. First of all, taking into account that the dispersion characteristics of simple normal waves (group velocity) are sensitive to the density and sound velocity of the seafloor and are not sensitive to the seafloor absorption coefficient, adaptive time-frequency analysis method is used to obtain the arrival time difference of simple waves of different numbers with different frequencies As a cost function, a global optimization algorithm is used to invert the layered structure of seabed density and sea sound velocity, and the validity of the inversion results is evaluated by means of probability statistics. After inversion of the seafloor density and sound velocity, the acoustic emission loss with the continuous distance was obtained by using the experimental ship radiation noise to invert the seafloor absorption coefficient. Finally, the validity of the inversion results is verified by using the inversion parameters well for sound source localization.