Adaptive frequency-difference matched field processing for high frequency source localization in a noisy shallow ocean

TitleAdaptive frequency-difference matched field processing for high frequency source localization in a noisy shallow ocean
Publication TypeJournal Article
Year of Publication2017
AuthorsWorthmann BM, Song H.C, Dowling DR
JournalThe Journal of the Acoustical Society of America
Volume141
Pagination543-556
Date Published2017/04
Keywordsacoustic arrays,acoustic field,acoustic noise,acoustic radiators,acoustic signal processing,array signal processing,underwater sound
Abstract

Remote source localization in the shallow ocean at frequencies significantly above 1 kHz is virtually impossible for conventional array signal processing techniques due to environmental mismatch. A recently proposed technique called frequency-difference matched field processing (Δf-MFP) [Worthmann, Song, and Dowling (2015). J. Acoust. Soc. Am. 138(6), 3549–3562] overcomes imperfect environmental knowledge by shifting the signal processing to frequencies below the signal's band through the use of a quadratic product of frequency-domain signal amplitudes called the autoproduct. This paper extends these prior Δf-MFP results to various adaptive MFP processors found in the literature, with particular emphasis on minimum variance distortionless response, multiple constraint method, multiple signal classification, and matched mode processing at signal-to-noise ratios (SNRs) from −20 to +20 dB. Using measurements from the 2011 Kauai Acoustic Communications Multiple University Research Initiative experiment, the localization performance of these techniques is analyzed and compared to Bartlett Δf-MFP. The results show that a source broadcasting a frequency sweep from 11.2 to 26.2 kHz through a 106 -m-deep sound channel over a distance of 3 km and recorded on a 16 element sparse vertical array can be localized using Δf-MFP techniques within average range and depth errors of 200 and 10 m, respectively, at SNRs down to 0 dB.

DOI10.1121/1.4973955
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