Encontrados 34 documentos, a visualizar página 1 de 4
Using active and passive acoustics to assess O2 production of a Posidonia ocean...
Felisberto, P.; Zabel, F.; Rodriguez, O. C.; Santos, P.; Jesus, S. M.; Champenois, W.; Borges, A. V.; Santos, RuiThis work discusses the data acquired during two experiments conducted in October 2011 and May 2013 in the Bay of la Revellata, Calvi, Corsica for the purpose of developing an acoustic system for monitoring the oxygen production of a seagrass meadow.
Correlation between the acoustic noise field measured in a Posidonia oceanica b...
Felisberto, P.; Zabel, F.; Rodriguez, O. C.; Santos, P.; Jesus, S. M.; Champenois, W.; Borges, A. V.; Santos, R.During the period of one week, from May 8 to 15, 2013, acoustic data was gathered at three locations over a Posidonia oceanica bed in the Bay of Revellata, Corsica. Preliminary analysis of the acoustic data shows that the environmental noise field in the band 2-7kHz was dominant during the period. The noise in this band is generally associated with wind and surface agitation. However, the noise power was not si...
Passive acoustics as a tool for global ocean monitoring and exploration
Jesus, S. M.; Rodriguez, O. C.; Felisberto, P.; Soares, C.The ocean is vast, rich, fragile and unexplored. Despite a massive investment in the last years, ocean exploration remains localized at the ocean surface and in shallow coastal areas, covering merely 5% of the total volume. It is well known that marine life has perfectionned acoustics as its primarily sense for every day tasks such as locating preys, sensing danger, breeding, etc. So, in the ocean, sound has th...
Comparing the resolution of Bartlett and MVDR estimators for bottom parameter e...
Felisberto, P.; Schneiderwind, J.; Santos, P.; Rodriguez, O. C.; Jesus, S. M.This work compares the resolution of a pressure and vector sensor based conventional Bartlett estimator, with their MVDR estimator counterparts, in the context of bottom characterization with a short vertical array. Santos et al. [1]demonstrated the gain of a vector sensor array (VSA) based linear estimator (Bartlett) for generic parameter estimation. Moreover, it was shown that for bottom characterization the ...
Experimental results of underwater cooperative source localization using a sing...
Felisberto, P.; Rodriguez, O. C.; Santos, P.; Ey, Emanuel; Jesus, S. M.This paper aims at estimating the azimuth, range and depth of a cooperative broadband acoustic source with a single vector sensor in a multipath underwater environment, where the received signal is assumed to be a linear combination of echoes of the source emitted waveform. A vector sensor is a device that measures the scalar acoustic pressure field and the vectorial acoustic particle velocity field at a single...
Establishing research strategies, methodologies and technologies to link genomi...
Mazzuca, S.; Bjork, M.; Beer, S.; Felisberto, P.; Gobert, S.; Procaccini, G.; Runcle, J.; Silva, J.; Borges, A.V.; Brunet, C.; Buapet, P.A complete understanding of the mechanistic basis of marine ecosystem functioning is only possible through integrative and interdisciplinary research.This enables the predictionof change and possibly the mitigation of the consequences ofanthropogenic impacts. One major aim of the European Cooperation in Science and Technology (COST) Action ES0609 “Seagrasses productivity. From genes to ecosystem management,” is...
Comparing the resolution of Bartlett and MVDR processors for bottom parameter e...
Felisberto, P.; Schneiderwind, J.; Santos, P.; Rodriguez, O. C; Jesus, S. M.This work compares the resolution of a pressure and vector sensor based conventional Bartlett estimator, with their MVDR estimator counterparts, in the context of bottom characterization with a short vertical array. Santos et al. [1] demonstrated the gain of a vector sensor array (VSA) based linear estimator (Bartlett) for generic parameter estimation. Moreover, it was shown that for bottom characterization the...
Experimental results of underwater cooperative source localization using a sing...
Felisberto, P.; Rodriguez, O. C.; Santos, P.; Jesus, S. M.This paper aims at estimating the azimuth, range and depth of a cooperative broadband acoustic source with a single vector sensor in a multipath underwater environment, where the received signal is assumed to be a linear combination of echoes of the source emitted waveform. A vector sensor is a device that measures the scalar acoustic pressure field and the vectorial acoustic particle velocity field at a single...
Acoustic monitoring of the oxygen production of a seagrass meadow
Felisberto, P.; Zabel, F.; Martins, C.; Jesus, S. M.This paper discusses the data acquired in the Bay of la Revellata, Calvi, Corsica during October 2011 for the purpose of developing an acoustic system for monitoring the oxygen production of a seagrass meadow. In a range dependent very shallow water area, densely covered by Posidonia Oceanica seagrass , a sound source transmitted chirp signals in 3 different bands (400-800Hz, 1.5-3.5kHz and 6.5-8.5kHz) to 100m ...
Estimating the multipath structure of an underwater channel using a single vect...
Felisberto, P.; Rodriguez, O. C.; Jesus, S. M.This paper aims at estimating the multipath structure of an underwater acoustic channel using a single vector sensor. The multipath structure of an underwater acoustic channel measured by a single hydrophone from broadband signals is used for source localization or environmental monitoring applying model based methods. Usually these methods require a number of time consuming propagation model runs and an optimi...
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