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Adaptive focusing for wideband beamforming in multipath environments.

Publication ,  Journal Article
Ganti, A; Martinez, M; Hickman, G; Krolik, J
Published in: The Journal of the Acoustical Society of America
January 2025

This paper addresses achieving the high time-bandwidth product necessary for low signal-to-noise ratio (SNR) target detection and localization in complex multipath environments. Time bandwidth product is often limited by dynamic environments and platform maneuvers. This paper introduces data-driven wideband focusing methods for passive sonar that optimize parameterized unitary matrices to align signal subspaces across the frequency band without relying on wave propagation models which are subject to mismatch in complex multipath environments. The methods minimize the log-determinant of the wideband covariance, a measure indicative of matrix rank, ensuring the coherence of wideband data and preserving SNR. We propose two approaches: a fully adaptive method with parameters scaling directly with the number of frequency bins, and a partially adaptive method that shares parameters across frequencies to improve robustness to noise. Simulations are conducted in a shallow-water waveguide scenario to demonstrate the flexibility of data-driven focusing over traditional model-based approaches. Results from the SWellEx-96 S59 event validate our methods, showing improvement in tonal target detection and localization in the presence of strong wideband interference.

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Published In

The Journal of the Acoustical Society of America

DOI

EISSN

1520-8524

ISSN

0001-4966

Publication Date

January 2025

Volume

157

Issue

1

Start / End Page

542 / 553

Related Subject Headings

  • Acoustics
 

Citation

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ICMJE
MLA
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Ganti, A., Martinez, M., Hickman, G., & Krolik, J. (2025). Adaptive focusing for wideband beamforming in multipath environments. The Journal of the Acoustical Society of America, 157(1), 542–553. https://doi.org/10.1121/10.0034789
Ganti, Anil, Michael Martinez, Granger Hickman, and Jeffrey Krolik. “Adaptive focusing for wideband beamforming in multipath environments.The Journal of the Acoustical Society of America 157, no. 1 (January 2025): 542–53. https://doi.org/10.1121/10.0034789.
Ganti A, Martinez M, Hickman G, Krolik J. Adaptive focusing for wideband beamforming in multipath environments. The Journal of the Acoustical Society of America. 2025 Jan;157(1):542–53.
Ganti, Anil, et al. “Adaptive focusing for wideband beamforming in multipath environments.The Journal of the Acoustical Society of America, vol. 157, no. 1, Jan. 2025, pp. 542–53. Epmc, doi:10.1121/10.0034789.
Ganti A, Martinez M, Hickman G, Krolik J. Adaptive focusing for wideband beamforming in multipath environments. The Journal of the Acoustical Society of America. 2025 Jan;157(1):542–553.

Published In

The Journal of the Acoustical Society of America

DOI

EISSN

1520-8524

ISSN

0001-4966

Publication Date

January 2025

Volume

157

Issue

1

Start / End Page

542 / 553

Related Subject Headings

  • Acoustics