Results 121 to 130 of about 1,232 (173)
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Novelty Detection in Passive Sonar Systems using Stacked AutoEncoders
2018 International Joint Conference on Neural Networks (IJCNN), 2018Modern military ships have become more silent in the recent years, so that their detection, tracking, and classification have become even more challenging. Submarines rely very much on passive sonar systems, which might operate in a multi-class scenario.
Vinicius dos Santos Mello +2 more
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SPOTLIGHT: a signal-processing system for passive SONAR
The Journal of the Acoustical Society of America, 1977SPOTLIGHT is an integrated signal-processing display system which employs a time-amplitude-frequency orthogonal display and a hidden line-removal technique to reduce clutter and create the appearance of a relief map. The signal processor employs an ideal box-car integrator and overlapped transform methods to allow significant signal-processing gains ...
G. A. Rahe, C. B. Robbins
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Passive sonar fusion for submarine C/sup 2/ systems
IEEE Aerospace and Electronic Systems Magazine, 2000The most important sensors for gathering target information onboard a submarine are passive sonars. Problems concerning fusion of these passive sonars are discussed. Three typical passive sonars-passive noise sonar, passive ranging sonar and acoustic pulse surveillance sonar-constitute a passive sonar system for data fusion.
P. Shar, X. Rong Li
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Enlarging neural class detection capacity in passive sonar systems
2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353), 2003A neural discriminating analysis is used for classifying passive sonar signals. Preprocessed information from the amplitude spectra of the noise radiated from ships is projected onto only a few principal discriminating components for feeding the input nodes of the neural classifier.
W. Soares-Filho +2 more
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Passive fiber optic sonar system
The Journal of the Acoustical Society of America, 1982A fiber optic sonar system wherein first and second optical fibers are wound on a common mandrel and provided with a light energy beam. An acoustic signal differentially varies the index of refraction of the optical fibers to result in an interference pattern dependent upon the frequency of the received acoustic signal or signals.
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Multi-frame Track-before-detect Algorithm for Passive Sonar System
2019 International Conference on Control, Automation and Information Sciences (ICCAIS), 2019It has been widely verified superiority of multi-frame track-before-detect (MF - TBD) for weak-target detection and tracking. In this paper we apply MF - TBD approach to solve weak unknown and time-varying number of targets detection and tracking problem for passive sonar system with excellent concealment. MF - TBD signal processing method is exclusive
Qiyun Peng, Wujun Li, Lingjiang Kong
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Target classification in a passive sonar-an expert system approach
International Conference on Acoustics, Speech, and Signal Processing, 2002A study of passive classification of underwater targets is made. A set of features pertaining to four different classes of vessels are identified, and methods of extraction of these features from the data are outlined. An expert system using Turbo PROLOG is developed for classifying the vessels. The confidence level of the classifier is analyzed. >
R. Rajagopal +2 more
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A passive sonar system based on an autonomous underwater vehicle
IEEE Journal of Oceanic Engineering, 2001Autonomous underwater vehicles (AUVs) are typically used to "actively" probe the ocean, using sensors that are mounted on a vehicle that moves through the water column. A more challenging task is to use an AUV to position a bottom-mounted stationary platform, such as a passive sonar that requires a large aperture.
S.A.L. Glegg +3 more
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Target detection using a neural network based passive sonar system
International Joint Conference on Neural Networks, 1989A neural-network (NN)-based system for the passive detection of targetlike signals in underwater acoustic fields is being developed. The input to the NN is an intensity modulated signal, which is a measure of the power of the received signal plus noise at different frequencies as time varies.
null Khotanzad, null Lu, null Srinath
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Novelty detection in passive SONAR systems using support vector machines
2015 Latin America Congress on Computational Intelligence (LA-CCI), 2015In naval warfare operations, several techniques have been developed for passive sonar signal detection and classification. Sonar systems operate over very noisy conditions and, eventually have to be identified new classes without loosing much efficiency to classes for which both, the sonar operator (OS) and a given decision support system have been ...
Natanael Nunes de Moura +1 more
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