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International Journal of Antennas and Propagation
Volume 2018, Article ID 7267601, 12 pages
https://doi.org/10.1155/2018/7267601
Research Article

Two- and Three-Dimensional Fast Intrawall Imaging with Microwave Tomographic Algorithm

Antenna Research Laboratory, Department of Electrical and Computer Engineer, Villanova University, Villanova, PA 19085, USA

Correspondence should be addressed to Ahmad Hoorfar; ude.avonalliv@rafrooha

Received 30 May 2017; Revised 15 October 2017; Accepted 7 November 2017; Published 9 January 2018

Academic Editor: Ana Alejos

Copyright © 2018 Wenji Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A fast and efficient microwave tomographic algorithm is proposed for 2-D and 3-D real-time intrawall imaging. The exploding reflection model is utilized to simplify the imaging formulation, and the half-space Green’s function is expanded in the spectral domain to facilitate the easy implementation of the imaging algorithm with the fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT). The linearization of the inversion scheme and employment of FFT/IFFT in the imaging formula make the algorithm suitable for various applications pertaining to the inspection of a large probed region and allow real-time processing. Representative numerical and experimental results are presented to show the effectiveness and efficiency of the proposed algorithm for real-time intrawall characterization.