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arXiv 2007.05790math.AP
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随机势的逆弹性散射

Inverse Elastic Scattering for a Random Potential

Jianliang Li, Peijun Li, Xu Wang

摘要:

研究了具有随机势的时谐弹性波方程的逆散射问题。作为一种分布,潜在的假设是一个微局部各向同性的广义高斯随机场的协方差算子被描述为一个经典的伪微分算子。其目的是确定的主象征的协方差算子从散射波测量在一个有界的域,有一个积极的距离域的潜力。对于这样一个粗糙势,通过研究等价的Lippmann-Schwinger积分方程,建立了分布意义下的直接散射问题的适定性.对于逆散射问题,它示出的协方差算子的主象征,可以唯一地确定由散射波的振幅平均在频带上从一个单一的实现的随机潜在的概率1。分析采用玻恩近似在高频,渐近的弹性波方程的格林张量,和微局部分析的傅里叶积分算子。

英文摘要:

This paper is concerned with an inverse scattering problem for the time-harmonic elastic wave equation with a random potential. Interpreted as a distribution, the potential is assumed to be a microlocally isotropic generalized Gaussian random field with the covariance operator being described by a classical pseudo-differential operator. The goal is to determine the principal symbol of the covariance operator from the scattered wave measured in a bounded domain which has a positive distance from the domain of the potential. For such a rough potential, the well-posedness of the direct scattering problem in the distribution sense is established by studying an equivalent Lippmann--Schwinger integral equation. For the inverse scattering problem, it is shown with probability one that the principal symbol of the covariance operator can be uniquely determined by the amplitude of the scattered waves averaged over the frequency band from a single realization of the random potential. The analysis employs the Born approximation in high frequency, asymptotics of the Green tensor for the elastic wave equation, and microlocal analysis for the Fourier integral operators.

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