Time-frequency representations for wideband acoustic signals in shallow water
Date of Original Version
Wideband acoustic propagation in shallow water has a unique arrival structure due to modal group speed dispersion. It is possible to unravel the modal dispersion characteristics using a proper time-frequency (TF) analysis. During the Asian Seas International Acoustics Experiment (ASIAEX) - East China Sea (ECS) experiment, signals collected by the vertical arrays have been processed using several time-frequency analysis techniques. Based upon the dispersion characteristics of acoustic propagation, theoretical time-frequency structure is used to determine the change of group delay. We present an improved time-frequency representation to provide higher resolution for TF diagrams using ECS data. The dispersion characteristics of ECS data are observed from these TF diagrams, and are verified by a theoretical model. Using this technique, higher modes can be observed with good resolution; this aids in increasing the performance of the inversion technique for long range sediment tomography.
Publication Title, e.g., Journal
Oceans Conference Record (IEEE)
Chen, Chuen S., James H. Miller, G. F. Boudreaux-Bartels, Gopu R. Potty, and Colin J. Lazauski. "Time-frequency representations for wideband acoustic signals in shallow water." Oceans Conference Record (IEEE) 5, (2003). https://digitalcommons.uri.edu/ele_facpubs/119