Results 171 to 180 of about 3,240 (206)

Real-time continuous active sonar processing

OCEANS 2015 - Genova, 2015
This work describes the development of continuous active sonar (CAS) processing at CMRE. The software uses subband processing to achieve a faster update rate than is possible with pulsed active sonar (PAS). The software development was based on CMRE's PAS processing software, CAINPro, which has been thoroughly tested during previous sea trials and in ...
Gaetano Canepa, Andrea Munafo, Michele Micheli, Luca Morlando, Stefan Murphy   +4 more
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Modern, active sonar AGC design considerations

ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1984
The following identifies key elements of the AGC design problem for active sonars. Because the character of the background noise and of the echo are highly dependent on a sonar environment that varies from place to place and from hour to hour, the signal statistics are unknown. Researchers have left the area of AGC design to practitioners; such designs
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Active Sonar Target Channel

2022
Junying Hui, Xueli Sheng
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Matched field detection by active sonar

'Challenges of Our Changing Global Environment'. Conference Proceedings. OCEANS '95 MTS/IEEE, 2002
The problems of underwater acoustic detection by active sonar are studied. Using a generalized likelihood ratio test, a background reverberation-adaptive detector for targets is derived. The algorithm provides constant false alarm rate performance in locally stationary Gaussian reverberation environments.
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Low frequency continuous active sonar

2011
Existing sonar systems are commonly deployed at a low duty cycle, i.e. a short transmit signal is used followed by a long listening time. As a result, the target is only illuminated during a short time resulting in only one detection opportunity per ping.
Vossen, R. van, Spek, E. van der, Beerens, S.P.   +2 more
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Array Modeling of Active Sonar Clutter

OCEANS 2007, 2007
Active sonar systems operating in shallow-water environments often deal with excessive false alarms, generically referred to as clutter, that are more numerous than expected for Rayleigh-distributed reverberation. The clutter probability density function, and therefore the probability of false alarm (P fa), depends on the scattering sources ...
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Active Sonar

2022
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ACTIVE SONAR ACOUSTICS

Bioacoustics, 2008
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4933914 Channel adaptive active sonar

Deep Sea Research Part B. Oceanographic Literature Review, 1990
Paul L Feintuch, Francis A Reed
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Research on Obstacle Detection and Avoidance of Autonomous Underwater Vehicle Based on Forward-Looking Sonar

IEEE Transactions on Neural Networks and Learning Systems, 2023
Xiang Cao, Lu Ren, Changyin Sun
exaly