Analysis of underwater coherence transmission loss by finite difference method based on wave equation
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In the underwater environment, waves undergo complex propagation due to complicated sound velocity structures and various environmental variables. The signal recorded in the underwater environment includes the coherence signal by the multipath, such as the direct wave, surface- and bottom-reflected waves, and refracted wave according to the sound velocity structure. Analyz-ing the accurate multipath coherence signal is one of the important factors for identifying targets underwater. This requires wave propagation modeling. In this study, a coherence transmission loss model is generated by solving the three-dimensional acoustic wave equation by the finite difference method, which is one of the methods to more accurately simulate wave propagation in the underwater acoustic environment. The generated coherence transmission loss model is compared and analyzed using the BELLHOP model provided by the U.S. Office of Naval Research. The coherence transmission loss model based on the wave equation has limita-tions in terms of its computer memory requirements and computational cost. However, by presenting a method to implement a coher-ence transmission loss model for a source with complex frequency characteristics, if computer technology develops sufficiently, the range of utilization of this method is expected to increase.
Abstract
In the underwater environment, waves undergo complex propagation due to complicated sound velocity structures and various environmental variables. The signal recorded in the underwater environment includes the coherence signal by the multipath, such as the direct wave, surface- and bottom-reflected waves, and refracted wave according to the sound velocity structure. Analyz-ing the accurate multipath coherence signal is one of the important factors for identifying targets underwater. This requires wave propagation modeling. In this study, a coherence transmission loss model is generated by solving the three-dimensional acoustic wave equation by the finite difference method, which is one of the methods to more accurately simulate wave propagation in the underwater acoustic environment. The generated coherence transmission loss model is compared and analyzed using the BELLHOP model provided by the U.S. Office of Naval Research. The coherence transmission loss model based on the wave equation has limita-tions in terms of its computer memory requirements and computational cost. However, by presenting a method to implement a coher-ence transmission loss model for a source with complex frequency characteristics, if computer technology develops sufficiently, the range of utilization of this method is expected to increase.
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