Multipath Broadband Localization, Bathymetry, and Sediment Inversion

Transmission of linearly frequency modulated pulses generates receptions at a vertical line array that can be cross correlated with the source signal to provide estimates of the oceanic waveguide impulse response. For short ranges, distinct path arrivals can be identified including the direct, surfa...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 2020-01, Vol.45 (1), p.92-102
Main Authors: Michalopoulou, Zoi-Heleni, Gerstoft, Peter
Format: Article
Language:English
Subjects:
Bathymeters
Bathymetry
Broadband
Estimation
Geoacoustic inversion
Impulse response
Jacobian matrices
linearization
Ocean floor
Parameter estimation
particle filter
Probability density function
Probability density functions
Probability theory
Receivers
Reflection
Sea measurements
Sediment
Sediments
Sound
Sound velocity
Thickness
Water circulation
Water column
Water depth
Water resources
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Summary:Transmission of linearly frequency modulated pulses generates receptions at a vertical line array that can be cross correlated with the source signal to provide estimates of the oceanic waveguide impulse response. For short ranges, distinct path arrivals can be identified including the direct, surface reflection, bottom reflection, and sediment reflection. Accurate estimation of arrival times of such paths is tightly related to successful inversion for source location and water column depth and sound speed and, subsequently, estimation of sediment sound speed and thickness. To achieve accurate estimation, particle filtering is applied to the received time series at 16 phones combined with a simple cross-correlation method. Using linearization, arrival time probability density functions are connected to the geometry and water column sound-speed parameters, providing point estimates as well as probability densities. These are then employed in sediment sound speed and thickness estimation. The results, obtained from the application of the method to data collected during the Seabed Characterization Experiment, are consistent with prior information on the site.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.2019.2896681