Results 251 to 260 of about 7,738 (278)

The STAP Method for Moving Sonar Reverberation Suppression

Applied Mechanics and Materials, 2015
The theory of full dimension and reduced dimension STAP was introduced. Based on the physical mechanism of reverberation formation, the suppression of moving sonar reverberation and the possibility of improvement of detection performance were analyzed and discussed, and the solutions of several key steps were given.
S.D. Zhao, Kun Yan, T.Z. Zhou
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Study on robust space-time adaptive reverberation suppressing

IEEE 10th INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING PROCEEDINGS, 2010
Reverberation covariance matrix is singular matrix owing to limited sample obtained by active sonar in non-stationarity environment. Basd on which, a robust space-time adaptive method is presented in this paper. The new method avoids singular matrix which aroused by small eigenvalue with diagonal loading.
Zhan Hao-ke, Ma Qu-li, Li Hai-lin
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Suppression of reverberations at fiber tips for optical ultrasound sensing

Optics Letters, 2020
Fabry–Perot-based ultrasound sensors at fiber tips have performed high sensitivity and immunity of electromagnetic interference with a relatively compact size. Nevertheless, the reverberation at fiber tips causes a strong noise that degrades the sensing capability.
Xiangdong Ma, Bingxue Liu, Yiqi Cai, Donglin Jia, Bo Fu, Lijun Xu, Jianguo Ma   +6 more
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Multi-Level Binary SVD for Sonar Reverberation Suppression

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO), 2018
In this paper, a multi-level binary singular value decomposition (MBSVD) algorithm used for reverberation suppression has been proposed. The binary singular value decomposition (BSVD) algorithm can separate the target echo from the strong reverberation.
Li Jiang, Yue Pan, Jiansheng Tang
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The reverberation suppression in wideband diver detection sonar

2014 Oceans - St. John's, 2014
The reverberation suppression is the foundation of target detection in diver detection sonar. The reverberation caused by the sea bottom is generally strong. Conventional methods with only amplitude cannot remove these reverberations completely because of the random temporal fluctuation of the signal amplitude, which causes false alarms especially in ...
Yang Juan, Xu Feng, Liu Jia, An Xudong, Ji Yongqiang   +4 more
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Lasso-based reverberation suppression in automatic speech Recognition

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015
Far-field automatic speech recognition (ASR) is challenging, mainly attributed to the high reverberation in the recordings. A novel linear sparse prediction model has been proposed to estimate and suppress reverberation. This model considers reverberation as a mixture of early and late reflections of the direct signal and estimates the late reflection ...
null Xuewei Zhang, null Yiye Lin, null Dong Wang   +2 more
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Reverberation suppression using dictionary learning in optical resolution photoacoustic microscopy

2017 IEEE International Ultrasonics Symposium (IUS), 2017
Photoacoustic Microscopy (PAM) offers a unique combination of high contrast from endogenous optical absorbers, and increased penetration to image microvasculature. However, images of the vasculature at increased depth are often corrupted by acoustic reverberation from superficial layers.
Sushanth Sathyanarayana, Bo Ning, Song Hu, John Hossack   +3 more
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A Hydrophone Perturbation Method for Reverberation Suppression

Journal of Information and Computational Science, 2014
Under the shallow sea condition, bottom reverberation is the main background noise. Especially the bottom and the buried targets echo are weak and signal-to-reverberation ratio is very low. So it is an important problem that how to improve the signal-to-reverberation ratio. This paper presents a method which is Perturbation Iteration Method. The method
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Space-time processing for suppression of bottom reverberation

Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers, 2002
The major problem for sonars operating in shallow water is the detection of low Doppler targets in the presence of severe bottom reverberation. For a modern sonar with an azimuthally omni-directional transmitter; the Doppler of bottom reverberation is proportional to /spl nu/cos /spl theta/ where /spl nu/ is the speed of the sonar platform and /spl ...
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Adaptive Reverberation Suppression Techniques for SHM in Composite Materials

Structural Health Monitoring 2015, 2015
This paper introduces a new method for Structural Health Monitoring using error functions computed from guided waves reflected from damage. The approach is experimentally tested on anisotropic specimens such as composite plates. The baseline and test signals of each sensing path (between two PZT transducers) are measured and the energy of the scattered
VINICIUS ROSA, VICENTE LOPES, ERIC FLYNN, MICHAEL TODD, CHARLES FARRAR   +4 more
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