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Sparse estimation of backscattered echoes from underwater object using integrated dictionaries

Meng, Xiangxia ; Li, Xiukun ; Jakobsson, Andreas LU orcid and Lei, Yahui (2018) In Journal of the Acoustical Society of America 144(6). p.3475-3484
Abstract

The problem of time-delays estimation of backscattered echoes from underwater targets is presented using a sparse reconstruction framework employing an integrated dictionary. To achieve high resolution, the used dictionary is usually defined over a finely spaced grid over the region of interest. Such a procedure may result in problems of being computational cumbersome or suffering from basis mismatch. In addition, the shape of the backscattered echoes may differ significantly from the expected waveforms used to form the dictionary, causing further mismatch problems. To alleviate such problems, the use of an integrated dictionary framework is introduced. Unlike traditional dictionaries that are defined over a set of grid points, the... (More)

The problem of time-delays estimation of backscattered echoes from underwater targets is presented using a sparse reconstruction framework employing an integrated dictionary. To achieve high resolution, the used dictionary is usually defined over a finely spaced grid over the region of interest. Such a procedure may result in problems of being computational cumbersome or suffering from basis mismatch. In addition, the shape of the backscattered echoes may differ significantly from the expected waveforms used to form the dictionary, causing further mismatch problems. To alleviate such problems, the use of an integrated dictionary framework is introduced. Unlike traditional dictionaries that are defined over a set of grid points, the elements in an integrated dictionary are formed by integrating the expected waveform over bands of the parameter space. The resulting dictionary may be used to find initial regions of the parameters of interest using a smaller dictionary than otherwise required, without suffering a loss of performance. The elements can also better match with the backscattered echoes, even if these differ from their expected shape. Simulated results of the backscattered echoes from a cylindrical shell, as well as results from experimental measurements, illustrate the performance of the proposed method.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Acoustical Society of America
volume
144
issue
6
pages
10 pages
publisher
American Institute of Physics (AIP)
external identifiers
  • scopus:85059294829
  • pmid:30599642
ISSN
0001-4966
DOI
10.1121/1.5083830
language
English
LU publication?
yes
id
e2167a2b-d7ac-4482-934c-3b63ddc048d7
date added to LUP
2019-01-16 08:31:25
date last changed
2021-09-15 02:59:36
@article{e2167a2b-d7ac-4482-934c-3b63ddc048d7,
  abstract     = {<p>The problem of time-delays estimation of backscattered echoes from underwater targets is presented using a sparse reconstruction framework employing an integrated dictionary. To achieve high resolution, the used dictionary is usually defined over a finely spaced grid over the region of interest. Such a procedure may result in problems of being computational cumbersome or suffering from basis mismatch. In addition, the shape of the backscattered echoes may differ significantly from the expected waveforms used to form the dictionary, causing further mismatch problems. To alleviate such problems, the use of an integrated dictionary framework is introduced. Unlike traditional dictionaries that are defined over a set of grid points, the elements in an integrated dictionary are formed by integrating the expected waveform over bands of the parameter space. The resulting dictionary may be used to find initial regions of the parameters of interest using a smaller dictionary than otherwise required, without suffering a loss of performance. The elements can also better match with the backscattered echoes, even if these differ from their expected shape. Simulated results of the backscattered echoes from a cylindrical shell, as well as results from experimental measurements, illustrate the performance of the proposed method.</p>},
  author       = {Meng, Xiangxia and Li, Xiukun and Jakobsson, Andreas and Lei, Yahui},
  issn         = {0001-4966},
  language     = {eng},
  number       = {6},
  pages        = {3475--3484},
  publisher    = {American Institute of Physics (AIP)},
  series       = {Journal of the Acoustical Society of America},
  title        = {Sparse estimation of backscattered echoes from underwater object using integrated dictionaries},
  url          = {http://dx.doi.org/10.1121/1.5083830},
  doi          = {10.1121/1.5083830},
  volume       = {144},
  year         = {2018},
}