arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.04542math.NAcs.NAphysics.comp-phphysics.med-ph
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逆声学散射中迭代算法与泛函解析算法的数值比较

Numerical comparison of iterative and functional-analytical algorithms for inverse acoustic scattering

A. S. Shurup

AI总结:

针对二维标量 Helmholtz 方程的声学层析成像,本文数值比较迭代算法与泛函解析算法,验证二者在中等和强散射体重建中的不同优势及相当的抗噪性与分辨率。

摘要:

本文研究了基于迭代算法和泛函解析算法的声学层析成像问题的数值求解。这些算法的数学性质此前已由 R.G.Novikov 在 Schrödinger 方程情形下的工作中加以描述。在本文中,针对二维标量 Helmholtz 方程情形,展示了迭代算法在重建中等强度散射体方面的效率,以及泛函解析方法在恢复强散射体方面的优势。文中考虑了一种在波矢空间中的滤波过程,该过程进一步提高了迭代算法的收敛性。声速扰动的重建结果表明,在重建中等强度散射体时,所考虑算法具有相当的抗噪性和分辨率。本文首次在逆声学散射问题中对迭代算法和泛函解析算法进行了比较性数值研究。

英文摘要:

In this work the numerical solution of acoustic tomography problem based on the iterative and functional-analytical algorithms is considered. The mathematical properties of these algorithms were previously described in works of R.G.Novikov for the case of the Schrödinger equation. In the present work, for the case of two-dimensional scalar Helmholtz equation, the efficiency of the iterative algorithm in reconstruction of middle strength scatterers and advantages of the functional-analytical approach in recovering strong scatterers are demonstrated. A filtering procedure is considered in the space of wave vectors, which additionally increases the convergence of the iterative algorithm. Reconstruction results of sound speed perturbations demonstrate the comparable noise immunity and resolution of the considered algorithms when reconstructing middle strength scatterers. A comparative numerical investigation of the iterative and functional-analytical algorithms in inverse acoustic scattering problems is implemented in this work for the first time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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