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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2017

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

Résumé

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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Dates et versions

hal-01653663 , version 1 (01-12-2017)

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Citer

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, 2017, 142 (4), pp.2143-2154. ⟨10.1121/1.5007727⟩. ⟨hal-01653663⟩
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