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Title: Size identification of underwater objects from backscattering signals of arbitrary looking angles
Authors: Li, W.
Liu, G.R. 
Zhang, X.M.
Keywords: Backscattering frequency spectrum
Inverse problem
Profile function
Ramp response
Size determination
Issue Date: Sep-2004
Citation: Li, W., Liu, G.R., Zhang, X.M. (2004-09). Size identification of underwater objects from backscattering signals of arbitrary looking angles. Journal of Computational Acoustics 12 (3) : 301-317. ScholarBank@NUS Repository.
Abstract: The inverse problem of determining the size, shape and orientation of a submerged object using the scattered field data is studied. Based on the physical optics approximate, the profile function of the object is found directly proportional to its ramp response that is the second integral of the impulse response. Through analyzing the feature of the ramp response in different computed frequency ranges, it is found that the low-frequency data are essential to the shape of the underwater object while the high-frequency data are very important to the size of the object. Therefore, when employing the high-frequency data to compute the ramp response, the edge of the object can only be highlighted in the illuminated region at certain aspect. Based on this finding, a new method is developed to estimate the size of underwater objects. The present method uses different frequency ranges to determine different parameters of the underwater objects so as to achieve the best accuracy. A number of examples are presented to demonstrate the effectiveness of the present method in using the ramp response technique to identify the size of both rigid and elastic bodies.
Source Title: Journal of Computational Acoustics
ISSN: 0218396X
DOI: 10.1142/S0218396X04002298
Appears in Collections:Staff Publications

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