分频带极坐标格式处理的水下目标层析成像研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (1) : 325-331.

声学研究与应用

分频带极坐标格式处理的水下目标层析成像研究

戴文舒*1，鲍凯凯2，张国军1，张文栋3，陈新华4

作者信息 +

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

Author information +

文章历史 +

摘要

声层析成像模型慢时间维和快时间维空间分辨率均相同，仅取决于发射信号最高频率，分辨率较聚束合成孔径声纳性能更优。现有的水下层析成像多采用时域反投影算法，计算量大。本文根据投影切片理论，提出了一种分频带极坐标格式融合的波数域成像方法，将宽带发射下圆环空间谱的直角坐标系插值求逆傅里叶变换问题转换为单频点圆形空间谱的求逆后的融合问题，减小了常规宽带波数域圆环插值带来的估计误差，克服了圆环形空间谱进行插值逆变换时重建的目标分布函数为中空的问题，提高了计算效率，并且有效的抑制了单频波数域成像结果为贝塞尔函数时的高副瓣影响，相同条件下，较聚束合成孔径声纳成像精度有显著提高。

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.

导出引用

戴文舒1, 鲍凯凯2, 张国军1, 张文栋3, 陈新华4. 分频带极坐标格式处理的水下目标层析成像研究[J]. 振动与冲击, 2025, 44(1): 325-331

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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