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Object identification by bistatic acoustic scattering

Karasalo, I. (author)
Skogqvist, Patrik (author)
KTH,Farkost och flyg
 (creator_code:org_t)
2005
2005
English.
Series: Oceans 2005 - Europe ; 1
  • Conference paper (peer-reviewed)
Abstract Subject headings
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  • An inversion technique is described for remote estimation of parameters of submerged or buried objects using a ROV-mounted directive acoustic source and a separately located vertical receiver array. The transmitter emits a train of pulses towards the object, and the scattered echoes are recorded at the receivers for subsequent parameter estimation. Parameters of the object are estimated by nonlinear global minimization of the misfit between the experimentally observed and model-predicted time-series. Two global minimization methods, a genetic algorithm (GA) and a differential evolution algorithm (DE), are considered. A fast approximative technique for computing the scattered field, the RK (Ray-Kirchoff) method, is described and used as forward model at the parameter search. The accuracy of the transient scattered field predicted by the RK method is assessed in a model case, using an accurate full-field boundary integral equation (BIE) method as reference. Experimental data are presented from a sea trial within the EU SITAR project in the Stockholm archipelago in Sept 2003. In the trial, a semi-buried box-shaped object was investigated using a ROV-mounted TOPAS 120 parametric sonar as source. A fitness function suitable for the characteristics of the experimental data and the accuracy properties of the RK method is formulated, and the inversion methods are applied on the data to estimate, in a step-wise manner, seven physical parameters of the object; range, depth, roll, yaw, pitch, density and soundspeed. The estimated parameter values are shown to reduce the model-data misfit significantly compared with those based on prior information only.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)

Keyword

Bistatic acoustic scattering
Differential evolution algorithm (DE)
Nonlinear global minimization
Ray-Kirchoff method
Acoustic emissions
Arrays
Genetic algorithms
Global optimization
Integral equations
Mathematical models
Parameter estimation
Time series analysis
Transceivers
Transmitters
Acoustic wave scattering

Publication and Content Type

ref (subject category)
kon (subject category)

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Royal Institute of Technology

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