浅海混响的垂直相干性

浅海混响垂直相干特性是海洋混响研究中一个重要的课题。在射线简正波混响理论的基础上,给出了浅海混响垂直相关的一般表达式,并推导出了在均匀层浅海中混响垂直相关的简化解析表达式。同时,通过对数值计算及实验结果的讨论,研究了浅海混响垂直相关与混响时间、频率、声源深度、接收器深度、海底衰减特性及海底散射系数等参数的变化关系。研究表明,在海底散射满足可分离性的条件下,浅海海底混响的垂直相关与声源位置无关,随着混响时间和海底衰减的增加、或随频率、接收器间隔和海深的减小,混响的垂直相关增大。

The vertical coherence of shallow water reverberation

The vertical correlation of shallow water reverberation is an interesting topic in the research of shallow water acoustics. The vertical correlation of shallow water reverberation was discussed based on the ray-mode reverberation model. A concise analytical expression for the vertical correlation of reverberation in isovelocity shallow water was derived. The relationships between the vertical correlation of reverberation with the reverberation time, frequency, source depth, receiver depth, bottom reflection loss, and bottom scattering coefficient were also discussed by the numerical calculation and experimental data. The results show that the vertical correlation of shallow water reverberation is independent of source depth based on the separable bottom scattering model, and it increases when reverberation time and bottom loss increase, or frequency, receiver separation, and water depth decrease.