Title: Overview of Signal Processing efforts at The Naval Physical and Oceanographic Laboratory, Kochi
1 Overview of Signal Processing effortsatThe
Naval Physical and Oceanographic Laboratory,
Kochi
A.Unnikrishnan, P. Muralikrishna, K E Nissar
2Thrust 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
3Sensor deployment
4Processing 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
5Independent 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
6Processing 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
7- 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