A high-resolution spectral estimation approach for evaluating the resonances of scattering returns from submerged targets

I-Tai Lu, Fu Po Wu

Research output: Contribution to journalArticle

Abstract

The principal aim of this work is to estimate the complex resonant frequencies of scattering returns from the Mock-0 target. The experiments were conducted at the Naval Undersea Warfare Center. First, the singular value decomposition approach is employed for noise suppressing prefiltering where the initial estimate of the system order is obtained. Second, the eigen-matrix pencil method is employed to approximate the complex resonant frequencies. Finally, the system order and the complex resonances are determined by a systematic procedure in which the estimated results obtained from various system orders and aspect angles are compared. Echoes observed at the same aspect angle but excited by different incident pulses with overlapping frequency spectra can also be employed to obtain reliable estimations of resonant frequencies. The key feature of the proposed approach is robustness.

Original languageEnglish (US)
Pages (from-to)2601-2607
Number of pages7
JournalJournal of the Acoustical Society of America
Volume106
Issue number5
DOIs
StatePublished - 1999

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resonant frequencies
high resolution
scattering
warfare
estimates
echoes
decomposition
matrices
pulses
Spectrality

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

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abstract = "The principal aim of this work is to estimate the complex resonant frequencies of scattering returns from the Mock-0 target. The experiments were conducted at the Naval Undersea Warfare Center. First, the singular value decomposition approach is employed for noise suppressing prefiltering where the initial estimate of the system order is obtained. Second, the eigen-matrix pencil method is employed to approximate the complex resonant frequencies. Finally, the system order and the complex resonances are determined by a systematic procedure in which the estimated results obtained from various system orders and aspect angles are compared. Echoes observed at the same aspect angle but excited by different incident pulses with overlapping frequency spectra can also be employed to obtain reliable estimations of resonant frequencies. The key feature of the proposed approach is robustness.",
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AB - The principal aim of this work is to estimate the complex resonant frequencies of scattering returns from the Mock-0 target. The experiments were conducted at the Naval Undersea Warfare Center. First, the singular value decomposition approach is employed for noise suppressing prefiltering where the initial estimate of the system order is obtained. Second, the eigen-matrix pencil method is employed to approximate the complex resonant frequencies. Finally, the system order and the complex resonances are determined by a systematic procedure in which the estimated results obtained from various system orders and aspect angles are compared. Echoes observed at the same aspect angle but excited by different incident pulses with overlapping frequency spectra can also be employed to obtain reliable estimations of resonant frequencies. The key feature of the proposed approach is robustness.

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