Applying time domain physical optics to acoustic wave backscattering problem |
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Authors: | Kookhyun Kim Dae-Seung Cho Woojae Seong |
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Institution: | a Dept. of Naval Architecture, Tongmyong University, 179, Sinseonno, Nam-gu, Busan 608-711, Republic of Korea b Dept. of Naval Architecture and Ocean Engineering, Pusan National University, 30, Jangjeon-dong, Guemjeong-gu, Busan 609-735, Republic of Korea c Dept. of Naval Architecture and Ocean Engineering, Seoul National University, San 56-1, Sillim-dong, Kwanak-gu, Seoul 151-744, Republic of Korea |
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Abstract: | The interest in transient analysis of acoustic waves has been growing in recent years, due to the advance of wide-band sonars. In this paper, a transient analysis method for acoustic backscattering signals is proposed based on the time domain physical optics (TDPO). TDPO is formulated via a theoretical inverse Fourier transform of the conventional physical optics formula used in the frequency domain wave scattering analyses. A hidden surface removal algorithm using an adaptive triangular beam method and a virtual surface concept are adopted to explain shadow effects and multiple reflections among elements, respectively. Numerical analyses are carried out for two kinds of underwater targets: a submarine pressure hull and an idealized submarine, in order to validate the proposed method. The result of the submarine pressure hull shows good agreements between the proposed method and conventional physical optics based on inverse fast Fourier transform. Additionally, the result of the idealized submarine shows that the proposed method is efficient for finding highlights including their contribution to the whole backscattering signal. |
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Keywords: | Transient analysis Acoustic wave backscattering Time domain physical optics Modulated Gaussian pulse Central finite difference method Hidden surface removal |
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