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Nonlinear time-warping made simple: A step-by-step tutorial on underwater acoustic modal separation with a single
Julien Bonnel1, Aaron Thode2, Dana Wright3
1Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
The Journal of the Acoustical Society of America
|April 3, 2020
Summary
This tutorial introduces warping, a signal processing method for analyzing underwater acoustic data from a single hydrophone. It simplifies complex ocean acoustics for researchers, enabling source localization and environmental characterization.
Area of Science:
- Ocean acoustics
- Signal processing
- Underwater acoustics
Background:
- Classical ocean acoustic experiments use sensor arrays.
- Interest in single-hydrophone methods is growing for large-area coverage and robotic platforms.
- Warping is a physics-based tool for analyzing low-frequency transient signals in shallow water.
Purpose of the Study:
- To provide a tutorial on warping theory and application.
- To demonstrate warping's utility for single-hydrophone processing.
- To offer resources for implementing warping in research.
Main Methods:
- Non-linear, physics-based signal processing (warping).
- Decomposition of multipath features in low-frequency transient signals.
- Application to shallow water environments and single hydrophone reception.
Main Results:
- Warping is a valuable pre-processing method for geoacoustic inversion.
- The technique has potential applications in bioacoustics.
- Tutorial provides theory, simulations, and experimental strategies.
Conclusions:
- Warping offers a user-friendly approach to complex ocean acoustic analysis.
- Supplementary materials (code, datasets) facilitate practical implementation.
- This work aims to broaden the adoption of warping in scientific research.
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