Narrowband acoustic doppler volume backscattering signal-part I: evolutionary spectral analysis

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Xiao-Jiao Tao, Ingvar Claesson, Nedelko Grbic
Title: Narrowband acoustic doppler volume backscattering signal-part I: evolutionary spectral analysis
Journal: IEEE Transaction on Signal Processing
Year: 2002
Volume: 50
Issue: 11
Pagination: 2644-2655
ISSN: 1053-587X
URI/DOI: 10.1109/TSP.2002.804097
ISI number: 000178713200003
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: xjtao@agere.com, icl@bth.se, ngr@bth.se
Language: English
Abstract: 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 spectral centroid estimate is discussed.
Subject: Signal Processing\Hydro-Acoustics
Signal Processing\Detection and Classification
Keywords: Acoustic Doppler effect, bias, evolutionary spectrum
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