Results 291 to 300 of about 4,113,395 (325)

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
T.S. Santoro, Gregory H. Wakefield
openaire   +2 more sources

Interference Mitigation for Multistatic Active Sonar

IEEE Journal of Oceanic Engineering, 2015
Two methods for detecting and classifying mutual interference between sources in multistatic active sonar systems are developed and compared for frequency-modulated transmissions. Both methods compare the output of matched-filtered time-series data using two different waveform replicas: the intended transmit replica and a hypothesized interferer ...
Brian R. La Cour, Jason M. Aughenbaugh, James M. Gelb   +2 more
openaire   +2 more sources

Trading detection for resolution in active sonar receivers

The Journal of the Acoustical Society of America, 2011
This paper proposes an active sonar receivers that offers a smooth trade-off between detection and resolution. A matched filter is the optimal detector of known signals in white Gaussian noise but may fail to resolve the targets if the time separation of targets is less than the mainlobe width of the autocorrelation function of the transmitted signal ...
Nabin S. Sharma, John R. Buck, James A. Simmons   +2 more
openaire   +3 more sources

Monte-carlo simulation of an active sonar

Radio and Electronic Engineer, 1970
This paper describes the analysis of a non-linear sonar processing system by simple Monte-Carlo methods. The target detection capability with isotropic background noise and spatially coherent reverberation is found with attention being paid to the effects of frequency filters in the input channels from the transducers.
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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.
openaire   +2 more sources

Active sonar processing for shallow water

Proceedings of OCEANS '93, 2002
This paper describes a method of improving active sonar performance in shallow water through specialized processing of the reverberation energy. A novel display is described which gives the sonar operator visual clues to help separate clutter from desired detections. Results of sea trials are also presented. >
openaire   +2 more sources

Sparse Representation Classification Method for Active Sonar Target Based on Multi-order Fractional Fourier Domain Feature Fusion

, 2021
TongJing Sun, Tong Liu, Yang Yang
semanticscholar   +1 more source

Evaluation of the Performance of Active Sonar Receivers

The Journal of the Acoustical Society of America, 1967
A method is devised for evaluating and comparing the performance of receivers used in an active sonar application. The basis of comparison is the level of background noise that will just bring the maximum signal excess, after system adjustment, to zero, given a propagation loss.
openaire   +2 more sources

Real-Time Underwater Maritime Object Detection in Side-Scan Sonar Images Based on Transformer-YOLOv5

Remote Sensing, 2021
Yongcan Yu, Jianhu Zhao, Chao Huang
exaly  

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