Abstract
Motivated by the 2012 Florida Straits Noise Interferometry Experiment, this paper investigates a time-reversal-based approach to acoustic remote sensing of the ocean. The signal processing mimics operation of a physical time-reversal mirror. The input data for the simulated time-reversal mirror can be obtained using either a compact, broadband sound source or cross-correlation of the diffuse noise recorded by spatially separated receivers. Low-frequency sound propagation is considered over ranges that are large compared to the water depth. The approach exploits the notion that the “best” focusing of the backpropagated time-reversed signal occurs at the “right point,” when the backpropagation takes place in the same propagation medium as the one, where the data have been acquired. Various metrics of the focusing quality are considered. A combination of spatial and temporal characteristics of the focus is proposed that leads to a robust and unique solution of the geoacoustic inverse problems considered for a single-element passive time-reversal mirror. Inputs with rather low signal-to-noise ratio prove acceptable, which is particularly important in the passive remote sensing context.
Original language | English |
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Article number | 109442 |
Journal | Applied Acoustics |
Volume | 210 |
DOIs | |
State | Published - Jul 2023 |
Bibliographical note
Funding Information:This work was supported by the National Science Foundation [award OCE1657430], the Office of Naval Research [awards N00014-21WX012342 and N00014-22WX01287], and the Aharon and Ephraim Katzir Study Grant. Authors thank Dr. Kevin B. Smith for helpful discussions. Use of high-performance computational facilities of Prof. Y. Makovsky’s Applied Marine Exploratory Laboratory at the University of Haifa is gratefully acknowledged.
Funding Information:
This work was supported by the National Science Foundation [award OCE1657430], the Office of Naval Research [awards N00014-21WX012342 and N00014-22WX01287], and the Aharon and Ephraim Katzir Study Grant. Authors thank Dr. Kevin B. Smith for helpful discussions. Use of high-performance computational facilities of Prof. Y. Makovsky's Applied Marine Exploratory Laboratory at the University of Haifa is gratefully acknowledged.
Publisher Copyright:
© 2023
Keywords
- Acoustic oceanography
- Noise interferometry
- Passive remote sensing
- Time reversal
- Underwater sound
ASJC Scopus subject areas
- Acoustics and Ultrasonics