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Increased Yangtze finless porpoise presence in urban Wuhan waters of the Yangtze River during fishing closures. [PDF]
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Collision avoidance passive sonar
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems - WUWNet '13, 2013Modems for underwater acoustic communications (acomms) have become nearly as much of a commodity technology as underwater releases or transponder systems. Modems today are at a similar stage as were mobile phones perhaps 15 years ago -- basic communications devices.
Dale Green, Steven J. McManus
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Sonar Operator Performance Considerations in Passive Sonar Systems
Proceedings of the Human Factors Society Annual Meeting, 1975Because 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 +3 more
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Passive synthetic aperture sonars, revisited
The Journal of the Acoustical Society of America, 1997Experimental 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
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Matrix filters for passive sonar
2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002This 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.
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Rate Distortion Bounds on Passive Sonar Performance
IEEE Transactions on Signal Processing, 2005Information 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
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Multirate spectral analysis for passive sonar
Integrated Computer-Aided Engineering, 2003Because 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, 2006Listening 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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