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 |
