Identification algorithms are considered for a class of targets situated near the bottom of a water channel. It is assumed that the target-sensor distance relative to the channel depth is such that a ray-based representation of the scattered fields is appropriate (vis-à-vis a modal representation). Two approaches are considered for processing the scattered fields. In one algorithm a deconvolution is performed to remove the channel response, and thereby recover the free-field target scattered signature. In this case the classifier is trained based on free-field data. In the second approach the array receiver is employed to point the sensor in particular directions, and the beam-formed signal is used directly in the subsequent classifier. In this case the classifier must be trained based on in-channel data. Multiple scattered signals are measured, from a sequence of target-sensor orientations, with the waveforms classified via a hidden Markov model. Example results are presented for scattering data simulated via the finite-element method and coupled to a normal-mode waveguide modal, for elastic targets situated in a water channel.
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March 2004
February 27 2004
Classification of distant targets situated near channel bottoms
Hongwei Liu;
Hongwei Liu
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708-0291
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Paul Runkle;
Paul Runkle
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708-0291
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Lawrence Carin;
Lawrence Carin
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708-0291
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Timothy Yoder;
Timothy Yoder
SFA Inc., Largo, Maryland 20774
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Thomas Giddings;
Thomas Giddings
Metron, Inc., Reston, Virginia 20190
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Luise Couchman;
Luise Couchman
Naval Research Laboratory, Physical Acoustics, Code 7130, Washington, DC 20375-5000
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Joseph Bucaro
Joseph Bucaro
Naval Research Laboratory, Physical Acoustics, Code 7130, Washington, DC 20375-5000
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J. Acoust. Soc. Am. 115, 1185–1197 (2004)
Article history
Received:
May 20 2002
Accepted:
November 19 2003
Citation
Hongwei Liu, Paul Runkle, Lawrence Carin, Timothy Yoder, Thomas Giddings, Luise Couchman, Joseph Bucaro; Classification of distant targets situated near channel bottoms. J. Acoust. Soc. Am. 1 March 2004; 115 (3): 1185–1197. https://doi.org/10.1121/1.1643363
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