Results 161 to 170 of about 23,037 (220)

Sonar Operator Performance Considerations in Passive Sonar Systems

Proceedings of the Human Factors Society Annual Meeting, 1975
Because of rapid developments in passive sonar technology, man-machine interface problems continue to demand human factors studies. This paper discusses display problems, operator variables, and research considerations. Data are presented from a recent study conducted by the authors comparing performance with photographic and static stimulus materials
R. J. Hornick, G. Yamashita, J. E. Robinson, H. J. Winkler   +3 more
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Passive synthetic aperture sonars, revisited

The Journal of the Acoustical Society of America, 1997
Experimental and analytical studies have clearly shown the feasibility and applicability of passive and active synthetic aperture sonars (SAS). These investigations have spanned the infrasonic to ultrasonic frequency range. However, passive SAS has not gained widespread use due to three arguments.
Edmund J. Sullivan, William M. Carey
openaire   +1 more source

Matrix filters for passive sonar

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
This paper introduces matrix filters as a tool for localization and detection problems in passive sonar. The outputs of an array of sensors, at some given frequency, can be represented by a vector of complex numbers. A linear filtering operation on the sensor outputs can be expressed as the multiplication of a matrix (called a matrix filter) times this
Vaccaro, Richard J., Harrison, Brian F.
openaire   +2 more sources

Rate Distortion Bounds on Passive Sonar Performance

IEEE Transactions on Signal Processing, 2005
Information theory provides a novel perspective on passive sonar. This approach begins by partitioning the search space and then considers the problem of assigning an unknown source to the correct partition based on pressure observations from a hydrophone array.
null Tianzhu Meng, J.R. Buck
openaire   +1 more source

Multirate spectral analysis for passive sonar

Integrated Computer-Aided Engineering, 2003
Because of widespread application in audio and image coding, subband structures are now well understood. Multirate subband implementations provide significant computational advantages while reducing distortion caused by sample rate changes. Some so-called perfect reconstruction systems can even eliminate all aliasing distortion caused by tandeming ...
Woodard, J., Creekmore, J.
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Antisubmarine Warfare: Passive vs. Active Sonar

The Two-Year College Mathematics Journal, 1983
(1983). Antisubmarine Warfare: Passive vs. Active Sonar. The Two-Year College Mathematics Journal: Vol. 14, No. 5, pp. 434-435.
L. Whitt, K. Wilk
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Active listening in passive-sonar soundscapes

The Journal of the Acoustical Society of America, 2006
Listening tasks differ across a variety of dimensions. Tasks that are characteristic of competing channels are those in which command and control signals are delivered simultaneously. Such signals are typically highly uncertain, statistically independent, and nonredundant. Tasks that are characteristic of cooperative channels are those in which sources
Gregory Wakefield, Thomas Santoro
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Passive sonar calibration spheres

The Journal of the Acoustical Society of America, 2001
The need for calibrated sonar targets is addressed with the development and testing of a set of thin-walled spheres filled with a high-density fluid. Using historical research information as a guide, a set of thin-walled metal spheres was developed and filled with a high-density fluid.
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Passive sonar processing using neural networks

[Proceedings] 1991 IEEE International Joint Conference on Neural Networks, 1991
The utilization of a two-stage neural network architecture for the detection of targets in a passive, listen-only sonar is discussed. The two-stage network consists of a first-stage Hopfield network to suppress noise, and a second stage using a bidirectional associative memory (BAM) to make the decision as to whether a target has been detected or not ...
P. Van-Houtte, K. Deegan, K. Khorasani
openaire   +1 more source

Range-sensitive Bayesian passive sonar tracking

2010 13th International Conference on Information Fusion, 2010
Passive sonar arrays are commonly operated under a far-field assumption in which the only observable parameter regarding target location is the direction of arrival of the target's signal. Range can be observed, but only when a target is in the near-field region of the array.
B A Yocom, J M Aughenbaugh, B R La Cour
openaire   +1 more source