Extracting the subsonic anti-symmetric lamb wave from a submerged thin spherical shell backscattering through iterative time reversal

Yu, Xiubo; Peng, Linhui; Yu, Gaokun

doi:10.1007/s11802-014-2166-8

Cited by 1 publication

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References 17 publications

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“…The procedure consists of exciting the target object with a broadband pulse, sampling the return with a finite time window, reversing the signal in time, and using this reversed signal as the source waveform for the next interrogation. It has been indicated that the spectrum of the returns rapidly converges to the dominant mode in the backscattering response, and the signal-to-noise of the target echo is enhanced for a target buried in different depths (Waters et al 2012a;Waters and Barbone 2012;Yu et al 2014). The MIIR, which was introduced by G. Maze (Maze et al 1988;Maze et al 1989), extracts elastic scattering in the time domain by transmitting a narrow pulse.…”

Section: Introductionmentioning

confidence: 99%

Feature Extraction for Acoustic Scattering from a Buried Target

2019

J. Marine. Sci. Appl.

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Elastic acoustic scattering is important for buried target detection and identification. For elastic spherical objects, studies have shown that a series of narrowband energetic arrivals follow the first specular one. However, in practice, the elastic echo is rather weak because of the acoustic absorption, propagation loss, and reverberation, which makes it difficult to extract elastic scattering features, especially for buried targets. To remove the interference and enhance the elastic scattering, the de-chirping method was adopted here to address the target scattering echo when a linear frequency modulation (LFM) signal is transmitted. The parameters of the incident signal were known. With the de-chirping operation, a target echo was transformed into a cluster of narrowband signals, and the elastic components could be extracted with a band-pass filter and then recovered by remodulation. The simulation results indicate the feasibility of the elastic scattering extraction and recovery. The experimental result demonstrates that the interference was removed and the elastic scattering was visibly enhanced after de-chirping, which facilitates the subsequent resonance feature extraction for target classification and recognition.

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Section: Introductionmentioning

confidence: 99%

Feature Extraction for Acoustic Scattering from a Buried Target

2019

J. Marine. Sci. Appl.

View full text Add to dashboard Cite

show abstract

Extracting the subsonic anti-symmetric lamb wave from a submerged thin spherical shell backscattering through iterative time reversal

Cited by 1 publication

References 17 publications

Feature Extraction for Acoustic Scattering from a Buried Target

Feature Extraction for Acoustic Scattering from a Buried Target

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