NDLI: Object identification by bistatic acoustic scattering

Content Provider	IEEE Xplore Digital Library
Author	Karasalo, I. Skogqvist, P.
Copyright Year	2005
Description	Author affiliation: FOI, Syst. Technl., Stockholm, Sweden (Karasalo, I.)
Abstract	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 September 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.
Starting Page	495
Ending Page	500
File Size	1084053
Page Count	6
File Format	PDF
ISBN	0780391039
DOI	10.1109/OCEANSE.2005.1511764
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic scattering Parameter estimation Scattering parameters Buried object detection Underwater acoustics Acoustic arrays Transmitters Acoustic pulses Minimization methods Genetic algorithms
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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