کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6422439 1632002 2015 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Globally convergent and adaptive finite element methods in imaging of buried objects from experimental backscattering radar measurements
ترجمه فارسی عنوان
روشهای عناصر محدود و همگرا و همگرا در تصویربرداری از اشیاء دفن شده از اندازه گیری های رادار آزمایشی
کلمات کلیدی
پراکندگی معکوس، شاخص های انکسار، الگوریتم همگرا در سطح جهانی، روش المان محدود سازگار،
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات ریاضیات کاربردی
چکیده انگلیسی

We consider a two-stage numerical procedure for imaging of objects buried in dry sand using time-dependent backscattering experimental radar measurements. These measurements are generated by a single point source of electric pulses and are collected using a microwave scattering facility which was built at the University of North Carolina at Charlotte. Our imaging problem is formulated as the inverse problem of the reconstruction of the spatially distributed dielectric constant εr(x),x∈R3, which is an unknown coefficient in Maxwell's equations.On the first stage the globally convergent method of Beilina and Klibanov (2012) is applied to get a good first approximation for the exact solution. Results of this stage were presented in Thành et al. (2014). On the second stage the locally convergent adaptive finite element method of Beilina (2011) is applied to refine the solution obtained on the first stage. The two-stage numerical procedure results in accurate imaging of all three components of interest of targets: shapes, locations and refractive indices. In this paper we briefly describe methods and present new reconstruction results for both stages.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational and Applied Mathematics - Volume 289, 1 December 2015, Pages 371-391
نویسندگان
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