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
Blekinge Institute of Technology, School of Engineering, Department of Signal Processing2005 (English)Conference paper (Refereed) Published
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.
Place, publisher, year, edition, pages
Washington: IEEE , 2005.
acoustic measurement, adaptive filters, array signal processing, delay estimation, hydrophones, least mean squares methods, oceanographic techniques, position control, underwater sound
IdentifiersURN: urn:nbn:se:bth-10245Local ID: oai:bth.se:forskinfo18A4483930D1E0B7C125710D002B847BISBN: 0 933957 34 3OAI: oai:DiVA.org:bth-10245DiVA: diva2:838326
OCEANS 2005 MTS/IEEE