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Sub-antenna processing for coherence loss in underwater direction-of-arrival estimation

Riwal Lefort 1 Rémi Emmetiere 1, 2, 3 Sabrina Bourmani Gaultier Real 4 Angélique Drémeau 2, 3
2 Lab-STICC_ENSTAB_CID_TOMS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
3 Pôle STIC_AP
ENSTA Bretagne - École Nationale Supérieure de Techniques Avancées Bretagne
Abstract : This paper deals with the loss of coherence in underwater direction-of-arrival estimation. The coherence loss, which typically arises from dynamical ocean fluctuations and unknown environmental parameters, may take the form of a multiplicative colored random noise applied to the measured acoustic signal. This specific multiplicative noise needs to be addressed with methodological developments. This paper proposes a weighting process that locally mitigates the effects of the coherence loss. More specially, a set of coherent sub-antennas is designed from the so-called Mutual Coherence Function (MCF). The assessed source position results from the combination of each sub-antenna by using a mixed norm. Two experiments are considered in the paper: either a random noise is sampled to simulate the effect of random ocean fluctuations, or a synthetic acoustic waveguide is used in which the coherence loss is due to some multipath interferences. It is shown that the weighting process allows for a decrease in the estimation error in comparison to a Conventional Beamformer (CB).
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https://hal.archives-ouvertes.fr/hal-01653663
Contributeur : Annick Billon-Coat <>
Soumis le : vendredi 1 décembre 2017 - 17:01:27
Dernière modification le : vendredi 20 novembre 2020 - 03:30:18

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Riwal Lefort, Rémi Emmetiere, Sabrina Bourmani, Gaultier Real, Angélique Drémeau. Sub-antenna processing for coherence loss in underwater direction-of-arrival estimation . Journal of the Acoustical Society of America, Acoustical Society of America, 2017, 142 (4), pp.2143-2154. ⟨10.1121/1.5007727⟩. ⟨hal-01653663⟩

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