Comparison between whitened generalized cross correlation and adaptive filter for time delay estimation with scattered arrays for passive positioning of moving targets in Baltic Sea shallow waters

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Viktoria Zetterberg, Mats Pettersson, Ingvar Claesson
Title: Comparison between whitened generalized cross correlation and adaptive filter for time delay estimation with scattered arrays for passive positioning of moving targets in Baltic Sea shallow waters
Conference name: OCEANS 2005 MTS/IEEE
Year: 2005
Pagination: 2356-61 Vol. 3
ISBN: 0 933957 34 3
Publisher: IEEE
City: Washington
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: viktoria.zetterberg@amlab.se
Language: English
Abstract: Results from an acoustic measurement campaign in shallow waters (at 22 meters depth) are given. Eight hydrophones, placed at the seabed, were used simultaneously to investigate how different distances between hydrophones affect the Time Delay Estimation (TDE). In order to position targets two TDE methods were applied. The used methods were the Generalized Cross Correlation (GCC) function weighted by the Phase Transform (PHAT) and an adaptive Normalized Least Mean Square (NLMS) filter estimating the TDE between pairs of sensors. The two methods gave approximately the same result, except for the largest baseline where the GCC PHAT performed better.
In the study we found that increasing separation distance decrease the bandwidth of coherence between the signals, however the study also indicated that scattered arrays with large baselines has better positioning capability than those with small baselines.
Subject: Signal Processing\Beamforming
Signal Processing\Radar and Sonar
Signal Processing\Hydro-Acoustics
Keywords: acoustic measurement, adaptive filters, array signal processing, delay estimation, hydrophones, least mean squares methods, oceanographic techniques, position control, underwater sound
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