Journal article
Canonical correlation analysis as a feature extraction method to classify active sonar targets with shallow neural networks
The Journal of the Acoustical Society of America, Vol.152(5), pp.2893-2904
11/2022
DOI: 10.1121/10.0015136
Abstract
Sonar target recognition remains an active area of research due to the complex entanglement of features from various acoustic scatterers, background clutter, and distortion by waveguide propagation effects. An equally challenging issue is due to different acoustic echoes returned from the target (including different target elements) itself. This work investigates the sonar target classification problem from a statistical perspective and aims to extract salient target feature vectors. Specifically, a multivariate statistical method is employed, canonical correlation analysis (CCA), as a feature extraction technique prior to multi-class classification of active sonar field data. The intuition behind using CCA is that persistent features slowly morph over time due to the changing aspect angles and platform positions and can be represented by maximally correlated projections of consecutive pings. CCA is applied using a sliding window, and the projections are used as feature vectors to train a neural network classifier. The smallest increase in classification accuracy when comparing the projection feature vectors to unprocessed feature vectors was 10%. The largest increase was 34%. The results are further examined through the use of confusion matrices and layer-wise relevance propagation, which distributes the trained networks output score to the input layer.
Details
- Title: Subtitle
- Canonical correlation analysis as a feature extraction method to classify active sonar targets with shallow neural networks
- Creators
- Bernice Kubicek - University of IowaAnanya Sen Gupta - University of IowaIvars Kirsteins - Naval Undersea Warfare Center
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.152(5), pp.2893-2904
- DOI
- 10.1121/10.0015136
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Number of pages
- 12
- Grant note
- 2021 / National Defense Science and Engineering Graduate (10.13039/100014037) N00014-21-1-2420 / Office of Naval Research Global (10.13039/100007297)
- Language
- English
- Date published
- 11/2022
- Academic Unit
- Electrical and Computer Engineering
- Record Identifier
- 9984315758002771
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