Underwater targets tomographic imaging based on sub-frequency band processing with polar coordinate format

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 325-331.

ACOUSTIC RESEARCH AND APPLICATION

Underwater targets tomographic imaging based on sub-frequency band processing with polar coordinate format

DAI Wenshu*1, BAO Kaikai2, ZHANG Guojun1, ZHANG Wendong3, CHEN Xinhua4

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Abstract

The slow time and fast-time spatial resolution of the underwater acoustic tomography model is the same, only depends on the highest frequency of the transmitted signal, and the resolution is better than that of the spotlight synthetic aperture sonar. At present, the time-domain back-projection algorithm is often used in the underwater tomography, which requires a large amount of calculation. In this paper, a wavenumber domain imaging method based on the theory of projection slicing is proposed, which integrates polar coordinate formats transformation results of each sub frequency band. The inverse Fourier transform problem of Cartesian coordinate interpolation of annulus space spectrum is transformed into the fusion problem of inverse Fourier transform of circular space spectrum of all single frequency under broadband emission, which reduces the estimation error caused by conventional wide-band wave number domain circular interpolation. The problem that the reconstructed target distribution function is a hollow ring is solved and the calculation efficiency is improved . Moreover, the effect of high side lobe on the imaging results of single frequency wave-number domain is effectively suppressed which significantly improves the imaging accuracy compared with the spotlight synthetic aperture sonar under the same conditions.

Key words

Sub band processing / Acoustic reflection tomography / Polar format transformation / Wavenumber interpolation

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DAI Wenshu1, BAO Kaikai2, ZHANG Guojun1, ZHANG Wendong3, CHEN Xinhua4. Underwater targets tomographic imaging based on sub-frequency band processing with polar coordinate format[J]. Journal of Vibration and Shock, 2025, 44(1): 325-331

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