underwater acoustics · purpose – research and development in acoustic signal processing and...
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Ocean Technology
Underwater Acoustics
C.E.Parente COPPE/Ocean Engineering Program Federal University of Rio de Janeiro
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Underwater Acoustics
LabSonar Prof. Seixas – Dr. Moura
Prof. C.E. Parente
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LabSonar
• Expertise Areas
• Detection and Classification
• Beamforming
• Blind Source Separation
• Signal Synthesis
Purpose – Research and development in acoustic signal processing and propagation
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• Detection and Classification
• Novelty detection using:
• SVM (Support Vector Machine)
• Neural Networks (Supervised and Non-
supervised)
• Classification using:
• Neural Networks
• Support Vector Machine
• Neural Network Ensemble
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• Beamforming
• Direction of Arrival (DOA) Estimation using:
• Delay and Sum in a Cylindrical Hydrophone Array
(CHA)
• Frequency Invariant Beamforming (FIB) in a
Linear Array
• Application
• Narrowband signals
• Wideband signals
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• Blind Source Separation
• Improve the detection and classification using:
• Independent Component Analysis (ICA) algorithms
• Non Negative Matrix Factorization (NMF) algorithms
• Application
• Low Frequency Analysis Recording (LOFAR) analysis
• Demodulation Envelope on Noise (DEMON) analysis
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• Signal Synthesis
• Simulation of various modes of underwater signal
propagation on the ocean using digital filters
• Application
• In shallow waters
• In deep waters
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• Thesis in progress
•D.Sc. thesis
• Novelty Detection in Passive Sonar System
• Specialist Committee Classification for Passive Sonar
System
• M.Sc. thesis
• Frequency Invariant Beamforming in Wideband
Passive Sonar Signals
• Signal to noise ratio analysis in a Cylindrical
Hydrophone Array
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LIOc Oceanographic Instrumentation Laboratory
Purpose – Research and Development in Underwater Acoustics and Ocean Instrumentation
• Expertise Areas
• Shallow water propagation
• Acoustic instrumentation
• Ocean wave data analysis and modelling
• Metocean buoys
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c0
c
c1
1 |
1 |
c1>c0
Shallow water propagation
• Possibility of total reflection
• Low frequency = small absortion
• Cilindrical losses
• result = long distance propagation
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A
B
D
C
Diferença de fase entre A e D:
= k (AB + BC + CD) + + = 2 m
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Shallow water propagation
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Shallow water propagation
• Range determination with passive techniques • Bottom geoacoustic parameters determination • Acoustic tomography • Seebeck acousticsyren effect in underwater propellers • Studies in volume scattering
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Acoustic Instrumentation
• Systems for noise measurements at sea • Array developments
paraquedas
hidrofone
cond. e data logger
espuma armação
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Ocean wave measurements, data analysis and modelling
• Use of MEMS in wave measurements • Development of techniques for wave data analysis using wavelets and presentation of spectra evolution. • Studies of wave climate along the brazilian coast using WW3 and SWAN models
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wave and wind direction
da
y o
f m
on
th
20.0 a 10.2 10.2 a 7.75 7.75 a 3.93 3.93 a 2.50
period band in seconds
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340 360 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340rumo em graus: corrente e vento
dia
do m
ês
CORRENTE - BACIA DE CAMPOS P18 - mar/2009
16 128 160 400 544
profundidade da camada-metros
90 66 44 27 74
veloc.max. camada - cm/svento
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Metocean Buoys
• R&D in metocean buoys
Brazilian Metocean Buoy
REMETEOO (1.200 m) Buoy
REMO (300 m) Deployment REMO (2.000 m) Maintenance
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Joint work with UE
OAEX – Ocean Acoustic Exploration – Acoustic experiments at sea – Participants: COPPE, BN /IEAPM, University of Algarve-Po, Université Libre de Bruxelles, University of Victoria - Canada 2007-2010
Cabo Frio RJ
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Other collaborations with UE
Students exchange: University of Algarve – 1 M.Sc., 1 D.Sc. Université Libre de Bruxelles – 1 M.Sc. Memorandum of Understanding – with UoS – University of Southampton 1 Student from UoS – D.Sc. at COPPE
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Suggestions for Collaboratios Between Brazil and Europe
• Embedded Systems for: Multi Parameters Data Acquisition platforms, Data Quality Control and/or Data processing
• Autonomous Underwater Vehicles (AUVs) and Autonomous Surface Vehicles (ASVs)
• Calibration Centres for Oceanographic Sensors
• Interchange with UE – universities and enterprises – of technology in data fusion, data acquisition, remote sensing and surveillance , connected with passive sonar systems. We would also welcome visiting professors.
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Thank you