浅海声传播及多途信号分解

Shallow water sound propagation and multipath signal decomposition

利用声传播的作用机理,使用耦合振动模拟水声传播过程,从新的角度对耦合问题以及浅海声传播进行分析,根据机电类比、拉式变换和Z变换原理,推导出了声能传播的表达式。对浅海信道中的多途声传播,使用多激励源下的声传播表达。该模型物理意义清晰、明确,便于分析浅海各条声线以及海面、海底的声学特性。然后,在此基础上对多途信号分离进行理论分析和水池实验验证。结果表明,多途信道之间的影响为线性叠加关系,相互间无调制;提出的方法能够有效分离出多途信道的各个多途分量,并估测出各个子信道的系统函数。

Coupled vibration is used to model and analyze underwater acoustic propagation from a new perspective on the base of sound propagation mechanism.Formulas of acoustic energy transmission are obtained from electrical analogy,Laplace-transform and Z-transform.The sound transmission function of multiple driving sources is used to model multipath channel sound propagation in shallow water.The physical meaning of this model is clear and easy to carry out the analysis of each the sound ray,as well as surface and bottom acoustic characteristics.Furthermore,the theoretical analysis and pool experiment of multipath signal decomposition are carried out.The result shows that the affection among multipath channels is a linear superposition relation and mutual unmodulated.The proposed method can effectively separate the sound ray of multipath channel and draw the system function of each sub-channel.