Publications [#338945] of Lawrence Carin

Papers Published

1. Liu, H; Runkle, P; Carin, L; Yoder, T; Giddings, T; Couchman, L; Bucaro, J, Classification of distant targets situated near channel bottoms, Journal of the Acoustical Society of America, vol. 115 no. 3 (March, 2004), pp. 1185-1197, Acoustical Society of America (ASA) [1.1643363], [doi]
   (last updated on 2024/12/31)

   Abstract:
   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. © 2004 Acoustical Society of America.

   Keywords:
   Sensors;Waveform analysis;Markov processes;Finite element method;Mathematical models;Algorithms;