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Geoacoustic inversion using ray-based blind deconvolution of shipping sources
Xuedong Zhang1, Nicholas C Durofchalk2, Haiqiang Niu1
1Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China.
The Journal of the Acoustical Society of America
|February 3, 2020
Summary
This study estimates channel impulse responses using a ray-based blind deconvolution algorithm. It infers bottom reflection loss from shipping sources, enabling geoacoustic parameter inversion for soft ocean layers.
Area of Science:
- Ocean acoustics
- Geophysics
- Signal processing
Background:
- Shipping sources present challenges for channel impulse response estimation due to shallow depths and low frequencies.
- Resolving direct, surface, bottom, and surface-bottom arrivals in channel impulse responses is difficult with shipping sources.
Purpose of the Study:
- To develop a method for inferring bottom reflection loss from shipping sources.
- To invert for geoacoustic parameters of shallow ocean layers using acoustic data.
Main Methods:
- Ray-based blind deconvolution algorithm for channel impulse response (CIR) estimation.
- Wideband beamforming to estimate unknown source phase.
- Analysis of magnitude spectra ratios of arrival pairs with frequency-dependent correction.
- Nonlinear least-square algorithm for geoacoustic inversion.
Main Results:
- Bottom reflection loss can be inferred from the ratio of magnitude spectra of specific arrival pairs.
- A frequency-dependent correction effectively addresses the dipole source effect.
- Successful inversion for geoacoustic parameters of a soft ocean layer.
Conclusions:
- The proposed method effectively infers bottom reflection loss from shipping sources.
- This approach enables the characterization of geoacoustic properties in shallow marine environments.
- The technique offers a data-driven solution for acoustic inversion problems.
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