• The Journal of the Acoustical Society of Korea
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• v.23 no.1E
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• pp.31-39
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• 2004

Backscattered underwater signals from multiple scatterers contain information regarding resolvable spatial distribution of scatterers. This experimental study describes the spectral characteristics of backscattered signal from multiple scatterers, which are regularly or randomly spaced, in terms of their amplitude and phase and a proper signal analysis that will eventually provide scatterer spacing estimation. Air-filled tubes suspended in water, steel balls and plastic tubes buried in the sediment are the multiple scatterers. The cepstrum and the spectral autocorrelation (SAC) methods were used to estimate the scatterer spacing from the backscattered signals. It was found that the SAC method could be improved by employing singular value decomposition (SVD) to extract the effective rank for the spectral components. Unlike the conventional method of estimating the density of scatterers within the insonified volume of water, this type of estimation method would provide better understanding of the spatial distribution of scatterers in the ocean.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.447-450
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• 2002

음향수조 내에 일정한 간격으로 배열된 단순 모양의 산란체들로부터 획득된 후방산란 신호를 분석하여 산란체 간격(scatterer spacing)을 추측 할 수 있는 방법을 연구하였다. 수신신호의 산란특성을 켑스트럼 피크(cepstral peaks)를 이용하여 산란체 간격으로 해석하였다. 임펄스 응답신호를 이용한 수치계산으로 산란체 간격 추정방법을 검증한 후, 수조 실험으로 획득한 후방 산란 신호에 적용해 그 결과를 비교해 보았다.