Results 131 to 140 of about 1,080 (154)
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Active sonar clutter classification using higher order moments
Proceedings of Meetings on Acoustics, 2010The statistics of normalized matched-filter echoes from an active sonar system operating in a myriad of oceanic environments has been studied extensively for three broad clutter classes including using low-order cumulants to classify subregions of the data [Gelb et al., Proceedings of the ISURC (2008) and references therein].
James M. Gelb, Andrew W. Oldag
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Optimum classification with active sonar: new theoretical results
[Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing, 1991Active underwater acoustic classification is a central sonar signal processing problem. The main thrust of this work is a critical evaluation of several key issues impacting on optimum processor implementation. To this end, the authors have developed systematic methods for evaluating the performance of the overall system.
James G. Kelly +3 more
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Temporal-Feature-Based Classification of Active Sonar Targets in a Deep-Water Environment
IEEE Transactions on Aerospace and Electronic SystemsDo-Hyun Park +2 more
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Neural networks for active sonar classification
Proceedings., 11th IAPR International Conference on Pattern Recognition. Vol.II. Conference B: Pattern Recognition Methodology and Systems, 2003Active sonar classification has been a challenging pattern recognition problem for many years mainly due to the complexity of ocean environment. Improvement of sensors and data acquisition can be very costly and can only provide limited improvement in classification.
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Active sonar classification using Bayesian decision theory
[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory, 2002Consideration is given to the performance analysis of optimal sonar classification. To perform active classification, a known waveform is transmitted into a medium and directed toward a region called the test volume. An array of N sensors is used to pick up the backscattered signal energy reflected from the M cells of the test volume, and the data are ...
R.N. Carpenter +3 more
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Noncontact Wideband Sonar for Human Activity Detection and Classification
IEEE Sensors Journal, 2014This paper suggests using a wideband sonar system to detect and classify human activity in indoor environment. The high bandwidth enables precise tracking of body parts, and its enhanced correlation properties can be used to dis- tinguish between human and nonhuman objects.
Gaddi Blumrosen +2 more
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Classification of active sonar detections with class specific method
The Journal of the Acoustical Society of America, 2007The use of the Class Specific Method (CSM) [P. M. Baggenstoss, Trans. Sig. Proc. 47, 3428–3432 (1999)] is demonstrated with numerically simulated data. The two models of a cylindrical shell and a fish school are shown to generate sufficient statistics with appropriate assumptions. The common reference signal for the CSM is Gaussian white noise.
Charles F. Gaumond, Ralph N. Baer
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Aural classification of impulsive-source active sonar echoes
The Journal of the Acoustical Society of America, 2006The goal of this effort is to develop automatic target classification technology for active sonar systems by exploiting knowledge of signal processing methods and human auditory processing. Using impulsive-source active sonar data, formal listening experiments were conducted to determine if and how human subjects can discriminate between sonar target ...
James Pitton +6 more
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Applying neural networks to automatic active sonar classification
[1990] Proceedings. 10th International Conference on Pattern Recognition, 2002The usefulness of applying neural network technology to active sonar classifier development is discussed. The authors offer qualitative results to help those interested in assessing this technology to reach a deeper understanding of its value. At a minimum, the nature of the observations strongly suggest that the best way to evaluate neural network ...
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Environmentally invariant features for classification of active sonar signals.
The Journal of the Acoustical Society of America, 2009Dispersion and damping (frequency-dependent spreading and attenuation) can be significant in shallow water sound propagation. These propagation-induced effects can be detrimental to classification of active sonar returns because the observed backscatter depends not only on the target, but also on the propagation environment and how far the wave has ...
Patrick Loughlin, Greg Okopal
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