Overview of Signal Processing efforts at The Naval Physical and Oceanographic Laboratory, Kochi

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Overview of Signal Processing effortsatThe
Naval Physical and Oceanographic Laboratory,
Kochi
A.Unnikrishnan, P. Muralikrishna, K E Nissar
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Thrust area Sonar Signal Processing and
Technology

• Detection
• Localization
• Recognition
• Tracking and
• Communication (underwater)

• Passive mode and Active mode
• Few Hz to 10 KHz
• Up to 80 KHz in Intercept

• Range, bearing, Speed
• Contact type
• Communicate to other platforms

Processing
Sensor
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Sensor deployment
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Processing approaches in Passive Sonar
Low SNRs Typically Negative

• Phased array Linear/cylindrical/planar/
• conformal
• Broad band Beam forming
• High resolution Techniques
• (MVDR)

• Single sensors
• (or a web of sensors)
• Pre-whitening
• Spectral processing

Classification based on spectral information

• Modeling (non-linear) Blind system
  identification
• Component separation ICA
• Fusion of responses from individual sensors
  /multiple phased arrays

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Independent Component Analysis
Mutual Information / Independence
Neural Networks
Fast ICA Algorithm
ICA
Higher Order Moments / Statistics
JADE
Time Structure / Eigen Decomposition
AMUSE
Algorithm for Multiple Unknown Signal Extraction
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Processing approaches in Active Sonar Phased
array Sonar low SNRs

• Narrow band beam forming
• Conventional
• STAP
• Detection coherent and non-coherent
• Classification Machine Learning
• Imaging Sonar (Mine hunting/Navigation)
• High frequency

High end processor High speed communication
links Standardization

• Contact motion Analysis for both Active and
  Passive Sonar IMM

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• Underwater Acoustic communication
• Transmission of voice and data
• Doubly spread channels
• Multi paths
• Underwater sensor networks

My Colleagues would now present further details
on Array processing and Acoustic Communication