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Kaikai Bao

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Proceedings Article | 18 December 2023 Paper

Sub-band acoustic reflection tomography method for underwater target imaging

Wenshu Dai, Kaikai Bao, Renxin Wang

Proceedings Volume 12968, 129680F (2023) https://doi.org/10.1117/12.3000758

KEYWORDS: Acoustics, Ultrasound reflection tomography, Detection and tracking algorithms, X-ray computed tomography, Fourier transforms, Underwater imaging, Signal processing, Interpolation, Image resolution, Acoustic waves

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The traditional linear-motion-based spotlight synthetic aperture sonar obtains the spatial distribution function of the target by sending out a specific bandwidth signal and using stolt interpolation and two-dimensional inverse Fourier transform technology. The spatial resolution in azimuth is limited both by the transmitted bandwidth and by the platform motion angle. The acoustic reflection tomography imaging sonar receives the cross-sectional echo of the target at 360 degrees. The spatial resolution of the acoustic reflection tomography depends only on the bandwidth of the transmitted signal, thus is better than that of the spotlight synthetic sonar. Based on this, a wavenumber domain imaging method of the acoustic reflection tomography is proposed in the paper. In each sub-band, the spatial spectrum is transformed from polar coordinate format to Cartesian coordinate format. The spatial distribution function can be reconstructed by sub band division and further be fused. It not only overcomes the problem that the target distribution function is torus and the imaging precision is low, but also avoids the estimation error and the calculation complexity caused by the torus interpolation in wavenumber domain.

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