Ocean Technology

Underwater Acoustics

C.E.Parente COPPE/Ocean Engineering Program Federal University of Rio de Janeiro

Underwater Acoustics

LabSonar Prof. Seixas – Dr. Moura

Prof. C.E. Parente

LabSonar

• Expertise Areas

• Detection and Classification

• Beamforming

• Blind Source Separation

• Signal Synthesis

Purpose – Research and development in acoustic signal processing and propagation

• 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

• 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

• 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

• Signal Synthesis

• Simulation of various modes of underwater signal

propagation on the ocean using digital filters

• Application

• In shallow waters

• In deep waters

• 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

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

c0

c

c1

1 |

1 |

c1>c0

Shallow water propagation

• Possibility of total reflection

• Low frequency = small absortion

• Cilindrical losses

• result = long distance propagation

A

B

D

C

Diferença de fase entre A e D:

= k (AB + BC + CD) + + = 2 m

Shallow water propagation

Shallow water propagation

• Range determination with passive techniques • Bottom geoacoustic parameters determination • Acoustic tomography • Seebeck acousticsyren effect in underwater propellers • Studies in volume scattering

Acoustic Instrumentation

• Systems for noise measurements at sea • Array developments

paraquedas

hidrofone

cond. e data logger

espuma armação

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

Metocean Buoys

• R&D in metocean buoys

Brazilian Metocean Buoy

REMETEOO (1.200 m) Buoy

REMO (300 m) Deployment REMO (2.000 m) Maintenance

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

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

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.

Thank you