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Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations

Publication ,  Journal Article
Krolik, JL; Hodgkiss, WS
Published in: Oceans Conference Record (IEEE)
December 1, 1991

Matched field source localization methods can be seriously degraded due to errors in modeling the propagation characteristics of the ocean channel. A maximum likelihood (ML) matched field beamformer is presented which achieves greater robustness to model mismatch caused bay uncertainty in the sound-speed profile between the source and receiver. The proposed modification of the standard ML beamformer consists of using multiple linear constraints derived from predicted pressure fields obtained using a set of perturbed sound-speed profiles. To investigate the nature of wavefront variations due to random sound-speed perturbations, a normal mode model based on adiabatic and first-order perturbation approximations is examined. This model suggests that the dimension of the new beamformer's signal constraint space can be small for moderate source ranges and sound-speed variations. Simulation results in a realistic deep-water Pacific ocean environment are reported which suggest that unambiguous source location estimates can be achieved at low frequencies with a sound-speed profile mismatch as large as 5 meters/second.

Duke Scholars

Published In

Oceans Conference Record (IEEE)

ISSN

0197-7385

Publication Date

December 1, 1991

Volume

2

Start / End Page

771 / 778
 

Citation

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Krolik, J. L., & Hodgkiss, W. S. (1991). Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations. Oceans Conference Record (IEEE), 2, 771–778.
Krolik, J. L., and W. S. Hodgkiss. “Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations.” Oceans Conference Record (IEEE) 2 (December 1, 1991): 771–78.
Krolik JL, Hodgkiss WS. Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations. Oceans Conference Record (IEEE). 1991 Dec 1;2:771–8.
Krolik, J. L., and W. S. Hodgkiss. “Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations.” Oceans Conference Record (IEEE), vol. 2, Dec. 1991, pp. 771–78.
Krolik JL, Hodgkiss WS. Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations. Oceans Conference Record (IEEE). 1991 Dec 1;2:771–778.

Published In

Oceans Conference Record (IEEE)

ISSN

0197-7385

Publication Date

December 1, 1991

Volume

2

Start / End Page

771 / 778