基于波形变形补偿的超宽带内成像雷达介电常数精确估计方法

Ryunosuke Souma, S. Kidera, T. Kirimoto
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引用次数: 1

摘要

超宽带脉冲雷达在介电介质中具有高距离分辨率和高通透性,在乳腺癌的无损检测或早期检测中具有很大的潜力。作为一种精确、高分辨率的介质内目标成像方法,扩展距离点偏移(RPM)技术得到了发展。虽然这种方法在均匀介质中提供了精确的内部目标图像,但它假定介质的介电常数是给定的,这对于一般应用来说是不实际的。虽然有各种各样的介电常数估计方法,但它们需要大量的计算或难以适用于任意介电边界。为了克服上述缺点,我们提出了一种适用于各种介质形状的介电常数估计方法,其中介电边界点及其法向量由原始的RPM方法精确确定。此外,该方法利用时域有限差分(FDTD)方法对散射波形变形进行迭代补偿,提高了介电常数估计的精度。数值模拟结果表明,即使对于波长大小的介电介质,该方法也能准确地估计出介电常数小于5%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Accurate permittivity estimation method by compensating waveform deformation for UWB internal imaging radar
Ultra-wideband pulse radar has high range resolution and permeability in a dielectric medium, and has great potential for non-destructive inspection or early-stage detection of breast cancer. As an accurate and high-resolution imaging method for targets embedded in dielectric medium, extended range points migration (RPM) has been developed. Although this method offers an accurate internal target image in a homogeneous media, it assumes the permittivity of the dielectric medium is given, which is not practical for general applications. Although there are various permittivity estimation methods, they require an enormous computation or are hardly applicable to an arbitrary dielectric boundary. To overcome the above drawbacks, we newly propose a permittivity estimation method suitable for various shapes of dielectric media, where the dielectric boundary points and their normal vectors are accurately determined by the original RPM method. In addition, our method iteratively compensates for the scattered waveform deformation using a finite-difference time domain (FDTD) method to enhance the accuracy of the permittivity estimation. Results from numerical simulation demonstrate that our method achieves accurate permittivity estimation less than 5 % even for a dielectric medium of wavelength size.
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