Results 251 to 260 of about 7,499 (273)

Reverberation Suppression Using Wideband Doppler-Sensitive Pulses

IEEE Journal of Oceanic Engineering, 2008
The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999.
Doisy, Y, Deruaz, L., IJsselmuide, S.P. van, Beerens, S.P., Been, R.   +4 more
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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
Vicente Lopes, Eric B. Flynn, Michael M. Todd, Vinicius Rosa, Charles R. Farrar   +4 more
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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.
Ma Qu-li, Zhan Hao-ke, Li Hai-lin
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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.
Jiansheng Tang, Yue Pan, Li Jiang
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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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The bottom reverberation suppression algorithm for side scan sonar

2014 Oceans - St. John's, 2014
The sea bottom reverberation is one of the important problems, which restrict the bottom targets detection performance with the high frequency imaging sonar. In this paper, a bottom reverberation suppression algorithm is presented to improve the performance of the high frequency side scan sonar for small target detection.
Xu Feng, An Xudong, Yang Juan, Liu Jia
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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 ...
Dong Wang, Xuewei Zhang, Yiye Lin
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Modeling and Suppression of Reverberation Components [PDF]

IEEE Seventh SP Workshop on Statistical Signal and Array Processing, 2005
G.S. Edelson, I.P. Kirsteins
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Sparse sample matrix inversion with diagonal loading for reverberation suppression

2011 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 2011
The main problem of active sonar detection is that the reverberation has spatial and temporal two-dimensional coupling characteristic which is similar to clutters in airborne radar. This paper presents a sparse sample matrix inversion with diagonal loading (SSMI-DL) for reverberation suppression in active sonar.
Ma Tian, Gao Wei, Huang Jian-guo, Zhang Qun-fei   +3 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.
Song Hu, John A. Hossack, Sushanth G. Sathyanarayana, Bo Ning   +3 more
openaire   +2 more sources