Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Behind Acoustic Doppler Current Profiler: Narrowband Volume Backscattering Signal Model, Analysis and Estimation
Responsible organisation
1999 (English)Report (Other academic)
Abstract [en]

This report examines the statistical properties of the narrowband Doppler volume backscattering process and discusses its spectral centroid estimation problem. After clarifying the mechanism of both the finite duration Doppler effect and the continuously space-shifted integration process, the first two order time-varying statistics under a more general assumption, i.e. von Mises distribution, of random phase are derived. The generalization permits nonuniform phase tendency, which occurs in layered medium scattering. Based on the locally stationary process model, the evolutionary spectrum of the signal is derived where the variation of the backscattering strength enters as an amplitude modulation. On the contrary, the variation of the random phase distribution acts as both the amplitude modulation and the frequency modulation. The observability and the estimation of the average flow speed are discussed. It is shown that even under the homogeneous condition, the spectral centroid does not coincide with the aver age flow speed. Finally, a semiparametric spectral centroid estimation method, which simply contains an AR(2) model with its time-varying coefficients adapted by a wavelet shrinkage is proposed.

Abstract [sv]

Fysikalisk meknism kring akustisk Doppler volym-återspridning har teoretiskt analyserats.

Place, publisher, year, edition, pages
1999.
Series
Blekinge Tekniska Högskola Forskningsrapport, ISSN 1103-1581 ; 15
Keyword [en]
ADCP, current measurement, volume backscattering, Doppler effect, non-stationary spectral analysis, wavelet shrinkage, TVAR
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-00129Local ID: oai:bth.se:forskinfo69BEE30C1FCFCEA6C12568A3002CAC17OAI: oai:DiVA.org:bth-00129DiVA: diva2:837932
Available from: 2012-09-18 Created: 2000-03-15 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

fulltext(799 kB)42 downloads
File information
File name FULLTEXT01.pdfFile size 799 kBChecksum SHA-512
08651b8f9436a46b18b93f2c5a95d7f3ee22e315ffc5ef88b670206bb2d083817d05b76ac6b8083f529c309686a8bd98dbcea0307bd398b42e7902dd6950c5a0
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Claesson, Ingvar
Signal Processing

Search outside of DiVA

GoogleGoogle Scholar
Total: 42 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 87 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf