Publication Date:
2022-05-25
Description:
Author Posting. © Acoustical Society of America, 2010. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 127 (2010): 2385-2391, doi:10.1121/1.3327799.
Description:
Mode filtering is most commonly implemented using the sampled mode shapes or pseudoinverse algorithms. Buck et al. [J. Acoust. Soc. Am. 103, 1813–1824 (1998)] placed these techniques in the context of a broader maximum a posteriori (MAP) framework. However, the MAP algorithm requires that the signal and noise statistics be known a priori. Adaptive array processing algorithms are candidates for improving performance without the need for a priori signal and noise statistics. A variant of the physically constrained, maximum likelihood (PCML) algorithm [A. L. Kraay and A. B. Baggeroer, IEEE Trans. Signal Process. 55, 4048–4063 (2007)] is developed for mode filtering that achieves the same performance as the MAP mode filter yet does not need a priori knowledge of the signal and noise statistics. The central innovation of this adaptive mode filter is that the received signal's sample covariance matrix, as estimated by the algorithm, is constrained to be that which can be physically realized given a modal propagation model and an appropriate noise model. Shallow water simulation results are presented showing the benefit of using the PCML method in adaptive mode filtering.
Description:
This work was supported by the Office of Naval Research
through ONR Grant Nos. N00014-05-10085 and
N00014-06-10788 and through the WHOI Academic Programs
Office.
Keywords:
Acoustic noise
;
Acoustic signal processing
;
Adaptive filters
;
Array signal processing
;
Maximum likelihood estimation
;
Underwater acoustic propagation
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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