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Narrowband acoustic...
Narrowband acoustic Doppler backscattering signal .I. Evolutionary Spectral Analysis
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- Tao, Xiao-Jiao (författare)
- Blekinge Institute of Technology
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- Claesson, Ingvar (författare)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- Grbic, Nedelko (författare)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Civilingenjörsutbildning med kinainriktning,Utbildningsprogram, LTH,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH,Master of Science in Engineering - Chinees,Educational programmes, LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- 2002
- 2002
- Engelska 12 s.
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Ingår i: IEEE Transactions on Signal Processing. - 1053-587X. ; 50:11, s. 2644-2655
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- This paper examines the statistical properties of the narrowband Doppler volume backscattering process and analyzes its evolutionary spectrum. 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. It is shown that the variation of the backscattering strength enters the spectrum as an amplitude modulation, whereas the variation of the random phase distribution acts as both the amplitude modulation and the frequency modulation. Finally, the observability of the average flow speed using the spectral centroid estimate is discussed.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
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- ref (ämneskategori)
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