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This paper presents a new signal processing tool: frequency warping, and its application in waveguide characterization. It can be applied in the context of signals recorded in shallow water (0-400 m) for an impulsive low-frequency source (0-200 Hz) and a single static receiver. In this configuration, propagation is described by modal theory: the recorded pressure field can be decomposed into several...
Source localization in shallow water is a crucial issue in underwater acoustics. The aim of this work is to propose efficient methods to perform source localization in depth and range using a single hydrophone. As a filtering method matched to single hydrophone configuration has been developed, the normal mode propagation model is considered. Several methods are exposed: incoherent matched mode processing...
This paper presents an automatic and passive localization algorithm for low frequency impulsive sources in shallow water. This algorithm is based on the normal mode theory which characterizes propagation in this configuration. It uses specific signal processing tools and time-frequency representations to automatically extract features of the propagation. Then, it uses the dispersive properties of...
This paper describes source depth estimation in shallow water environments using a Horizontal Line Array of hydrophones on the sea bottom. A method based on modal propagation, using mode amplitude modulus, has been proposed by Nicolas, B., et al, (2006). As knowledge of the sign of mode amplitudes can improve source depth estimation, we present a estimator of these signs and integrate them in the...
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