Time-Frequency Features of 3-D Sound Propagation in Wedge-Shaped Oceanic Waveguides

作     者：Sturm, Frederic Bonnel, Julien 

作者机构：Univ Lyon Ecole Cent Lyon Lab Mecan Fluides & Acoust UMR CNRS 5509 F-69134 Ecully France ENSTA Bretagne Univ Europeenne Bretagne Lab STICC UMR CNRS 6285 F-29806 Brest 9 France 

出 版 物：《IEEE JOURNAL OF OCEANIC ENGINEERING》 (IEEE J Oceanic Eng)

年 卷 期：2016年第41卷第3期

页      面：731-739页

核心收录：

学科分类：0808[工学-电气工程] 0707[理学-海洋科学] 08[工学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：French Government Defence procurement agency (Direction Generale de l'Armement) [ANR-12-ASTR-0021-03 "MER CALME"] 

主　　题：Normal mode propagation time-frequency analysis underwater acoustics 3-D propagation 

摘      要：This paper considers propagation of low-frequency broadband pulses in shallow water. It focuses on across-slope propagation in wedge-shaped oceanic waveguides and on single hydrophone receiving configurations. In a low-frequency shallow-water context, propagation is dispersive and usually described by modal theory. However, in the presence of a tilted bottom, propagation is also affected by 3-D effects ( horizontal refractions). The paper shows that time-frequency analysis is a suitable tool to illustrate and understand 3-D propagation. It illustrates the pertinence of the time-frequency analysis of 3-D signal by proposing an algorithm to estimate the seabed slope using a single receiver. The method is benchmarked on numerical simulations, and successfully applied on small-scale experimental data.