利用声波在北极深海的中断现象，估算声源深度。
Arctic Dispersion Interruption Phenomenon and Sound Source Depth Estimation
- 通过声速剖面计算模态节点位置，识别声波传播中断频率。
- 接收信号中出现的频段中断与模态频率对应，可反推声源深度。
- 适用于水下声源定位，尤其在北极复杂海洋环境中有效。
北极深海声速剖面导致表层形成正常模态波导。当声源或接收器深度接近特征函数的节点时，该模态无法被激发或检测，致使接收端模态振幅近似为零，表现为频散结构中的中断现象，可通过接收到的声信号进行时频分析观察。基于从接收信号中识别出的中断频率，结合由海洋声速剖面计算出的节点深度与模态频率关系，若已知接收器深度，即可估计声源深度。该现象及深度估计方法已通过仿真和实验验证。
原文摘要 · Abstract (English)
The sound speed profile in the deep Arctic Ocean causes the surface layer to form a normal mode waveguide. When the depth of the sound source or receiver is near a node of the eigenfunction, the source cannot excite the mode, or the receiver cannot detect it, resulting in the modal amplitude at the receiver being approximately zero. This manifests as a dispersion interruption in the dispersion structure, which can be observed through time-frequency analysis of the received acoustic signal. Based on the interruption frequency identified from the received signal, combined with the relationship between node depth and modal frequency calculated from the ocean sound speed profile, the source depth can be estimated if the receiver depth is known. The phenomenon of dispersion interruption and the method of estimating source depth have been validated through simulations and experiments.
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