Geoacoustic inversion of broadband data by matched beam processing

Yongmin Jiang, N. Ross Chapman, Harry A Deferrari

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This paper describes results of geoacoustic inversion using broadband signals from an experiment carried out at a site near the South Florida Ocean Measurement Centre in the Florida Straits. M-sequence coded pulse trains at different center carrier frequencies from 100 to 3200 Hz were recorded at a vertical line array at a distance around 10 km. Geoacoustic inversion was carried out to determine the feasibility of inverting the environmental parameters from this long-range propagation experiment. The received signal at lower frequencies below 400 Hz consisted of a dominant water column signal and a secondary arrival delayed by 0.4 s. The secondary signal was spatially filtered by beamforming the array data, and the beam data were inverted by matched beam processing in the time domain, combined with an adaptive simplex simulated annealing algorithm. The estimated values of compressional wave speed and density were in good agreement with ground truth values from sediment cores. The inverted shear wave speed appears to be a sensitive parameter and consistent with compressional wave speed. As a cross check, range and water depth were also included as inversion parameters, and the inversion results were close to the known values within small uncertainties.

Original languageEnglish (US)
Pages (from-to)3707-3716
Number of pages10
JournalJournal of the Acoustical Society of America
Volume119
Issue number6
DOIs
StatePublished - Jun 2006

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inversions
broadband
straits
ground truth
water depth
carrier frequencies
simulated annealing
beamforming
S waves
arrivals
oceans
sediments
low frequencies
propagation
Inversion
pulses
water
Waves
Experiment
Water

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Geoacoustic inversion of broadband data by matched beam processing. / Jiang, Yongmin; Chapman, N. Ross; Deferrari, Harry A.

In: Journal of the Acoustical Society of America, Vol. 119, No. 6, 06.2006, p. 3707-3716.

Research output: Contribution to journalArticle

Jiang, Yongmin ; Chapman, N. Ross ; Deferrari, Harry A. / Geoacoustic inversion of broadband data by matched beam processing. In: Journal of the Acoustical Society of America. 2006 ; Vol. 119, No. 6. pp. 3707-3716.
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