Noise substraction for improving the localisation of an underwater mobile

Author

Quinquis, A. ; Ioana, Cornel ; Thomas, Hélène

Author_Institution

ENSIETA, Brest, France

Volume

1

fYear

1999

fDate

1999

Firstpage

310

Abstract

An ultra short acoustic base line allows the localisation of an underwater mobile. POSIDONIA is an advanced system that provides the position of a named submersible, towed fish or ROV operating at depths between 50 m and 6000 m. To improve the localization information, an effective and original approach is proposed in this paper. The main problem which appears in this area consists in the fact that the noise characteristics are unknown. Hence, classical methods (for example, spectro-filter) are useless because they provide good performances only in the case where we know a noise reference. In this work, we use shift-invariant wavelet packets decomposition (SIWPD) and entropy criteria for noise rejection; we compare the results obtained with those obtained using SUREThresholding (WPD) denoising method

Keywords

acoustic noise; array signal processing; direction-of-arrival estimation; entropy; interference suppression; sonar arrays; sonar signal processing; underwater acoustic telemetry; underwater vehicles; wavelet transforms; POSIDONIA; ROV; SIWPD; SUREThresholding; WPD; denoising method; entropy criteria; localisation; noise characteristics; noise rejection; noise substraction; shift-invariant wavelet packets decomposition; towed fish; ultra short acoustic base line; underwater mobile; Acoustic measurements; Acoustic noise; Entropy; Marine animals; Noise reduction; Remotely operated vehicles; Signal to noise ratio; Underwater acoustics; Underwater vehicles; Wavelet packets;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS '99 MTS/IEEE. Riding the Crest into the 21st Century

Conference_Location

Seattle, WA

Print_ISBN

0-7803-5628-4

Type

conf

DOI

10.1109/OCEANS.1999.799762

Filename

799762