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| 改进快速迭代收缩阈值的声成像方法 |
| Acoustic imaging method via improved fast iterative shrinkage thresholding |
| 投稿时间：2025-04-23 修订日期：2025-06-24 |
| 中文摘要: |
| 声成像技术是一种非接触、高精度的声场可视化手段。为提升成像结果的空间分辨率和动态范围，本文借鉴函数型波束形成和快速迭代收缩阈值方法的各自优势，设计了一种改进的快速迭代收缩阈值方法。利用函数型波束形成得到的较清晰成像结果作为迭代起点，并对点扩散函数进行高阶指数运算，构造变换后的目标函数，对该目标函数进行迭代求解，在迭代过程中引入一种变步长策略以进一步提高算法收敛速度。双声源成像的仿真及消声室实验结果表明本文设计的改进方法在空间分辨率和动态范围两个指标上均有提升，能够得到更符合真实声源分布的成像结果。 |
| 英文摘要: |
| Acoustic imaging technology is a non-contact, high-precision method for visualizing sound fields. To enhance the spatial resolution and dynamic range of acoustic imaging, this paper draws on the respective advantages of functional beamforming algorithm and the fast iterative shrinkage-thresholding algorithm (FISTA) to design an improved FISTA algorithm. The clearer imaging results obtained from functional beamforming are used as the initial point, and a higher-order exponential operation is applied to the point spread function to construct a transformed objective function. This objective function is then solved iteratively, with a variable step size strategy introduced during the iteration process to further improve the convergence speed. Simulation and anechoic chamber experiments for two sound sources imaging demonstrate that the introduced methods can achieve better performance in both spatial resolution and dynamic range, and the imaging results reflect the true sound source distribution more accurately. |
| DOI： |
| 中文关键词: 声成像 波束形成 快速迭代收缩阈值 传声器阵列 |
| 英文关键词: Acoustic imaging Beamforming Fast iterative shrinkage threshold Microphone array |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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