Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/34643
Title: On methods to improve time delay estimation for underwater acoustic source localization
Authors: Patel, Bipin
Vadali, Siva Ram Krishna
Nandy, Sambhunath
Shome, Sankar Nath
Keywords: Detection;GCC-PHAT;Localization;Time delay estimation;Underwater acoustic communication
Issue Date: Feb-2015
Publisher: NISCAIR-CSIR, India
Abstract: This paper addresses the problem of acoustic source localization in shallow water environment commonly dominated by impulsive noise and multipath phenomenon. Traditionally acoustic source localization with sensors spaced several wavelengths apart involves Time Delay Estimation (TDE) via Generalized Cross-Correlation Phase Transform (GCC-PHAT)1. However multipath signals and impulsive noise in underwater ambience result in spurious peaks leading to anomalous time delay estimates, and in turn erroneous computation of source location. In the present work we recommend two methods to improve time delay estimation, based on order statistics and via signal detection. Simulation results indicate a significant improvement in time delay estimation as compared to GCC-PHAT in presence of impulsive noise and multipath induced fading.
Page(s): 237-244
URI: http://hdl.handle.net/123456789/34643
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.44(02) [February 2015]

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