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Parameter estimation of underwater moving sources by using matched Wigner transform.

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Title: Parameter estimation of underwater moving sources by using matched Wigner transform.
Authors: Xu, Lingji1 xulingji@mail.nwpu.edu.cn, Yang, Yixin1 yxyang@nwpu.edu.cn
Source: Applied Acoustics. Jan2016, Vol. 101, p5-14. 10p.
Subjects: Doppler effect, Gabor transforms, Underwater acoustics, Least squares, Time-frequency analysis
Abstract: According to the acoustical Doppler effect, an improved narrow-band technique is proposed to estimate underwater source’s motion parameters including speed, closest distance, rest frequency, and closest point of approach (CPA) time, by using a single receiving sensor. First, the matched Wigner transform (MWT), which produces a time–frequency distribution (TFD) with optimal energy concentration and without inner artifacts for a high-order polynomial phase signal, is defined. On the basis of the MWT, a method is developed for the accurate instantaneous frequency (IF) estimation of Doppler signal. Moreover, we deduce that the Wigner–Ville distribution of the Doppler signal has a peak at the center of the TFD. Thereafter, the CPA time is directly estimated. When the CPA time is obtained, the other motion parameters can be easily estimated by using a simplified amplitude weighted nonlinear least-squares method, which fits the IF estimates to the predicted Doppler shift. Finally, the effectiveness of the proposed scheme is validated by using underwater acoustic data. [ABSTRACT FROM AUTHOR]
Copyright of Applied Acoustics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 109955314
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Parameter estimation of underwater moving sources by using matched Wigner transform.
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  Data: <searchLink fieldCode="AR" term="%22Xu%2C+Lingji%22">Xu, Lingji</searchLink><relatesTo>1</relatesTo><i> xulingji@mail.nwpu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yang%2C+Yixin%22">Yang, Yixin</searchLink><relatesTo>1</relatesTo><i> yxyang@nwpu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Acoustics%22">Applied Acoustics</searchLink>. Jan2016, Vol. 101, p5-14. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Doppler+effect%22">Doppler effect</searchLink><br /><searchLink fieldCode="DE" term="%22Gabor+transforms%22">Gabor transforms</searchLink><br /><searchLink fieldCode="DE" term="%22Underwater+acoustics%22">Underwater acoustics</searchLink><br /><searchLink fieldCode="DE" term="%22Least+squares%22">Least squares</searchLink><br /><searchLink fieldCode="DE" term="%22Time-frequency+analysis%22">Time-frequency analysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: According to the acoustical Doppler effect, an improved narrow-band technique is proposed to estimate underwater source’s motion parameters including speed, closest distance, rest frequency, and closest point of approach (CPA) time, by using a single receiving sensor. First, the matched Wigner transform (MWT), which produces a time–frequency distribution (TFD) with optimal energy concentration and without inner artifacts for a high-order polynomial phase signal, is defined. On the basis of the MWT, a method is developed for the accurate instantaneous frequency (IF) estimation of Doppler signal. Moreover, we deduce that the Wigner–Ville distribution of the Doppler signal has a peak at the center of the TFD. Thereafter, the CPA time is directly estimated. When the CPA time is obtained, the other motion parameters can be easily estimated by using a simplified amplitude weighted nonlinear least-squares method, which fits the IF estimates to the predicted Doppler shift. Finally, the effectiveness of the proposed scheme is validated by using underwater acoustic data. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Acoustics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.apacoust.2015.07.020
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 5
    Subjects:
      – SubjectFull: Doppler effect
        Type: general
      – SubjectFull: Gabor transforms
        Type: general
      – SubjectFull: Underwater acoustics
        Type: general
      – SubjectFull: Least squares
        Type: general
      – SubjectFull: Time-frequency analysis
        Type: general
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      – TitleFull: Parameter estimation of underwater moving sources by using matched Wigner transform.
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            NameFull: Xu, Lingji
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            NameFull: Yang, Yixin
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              Text: Jan2016
              Type: published
              Y: 2016
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              Value: 101
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