RF Tomography in Free Space: Experimental Validation of the Forward Model and an Inversion Algorithm Based on the Algebraic Reconstruction Technique

Picco, Vittorio; Negishi, Tadahiro; Nishikata, Shingo; Spitzer, Douglas; Erricolo, Danilo

doi:10.1155/2013/528347

Cited by 16 publications

(4 citation statements)

References 14 publications

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“…In BIM, the total field within the cylinder E BIM n is achieved after 14 iterations with relative residual error less than 10 −4 . The regularization method for the inversion is the algebraic reconstruction technique [25], instead of the Tikhonov regularization in [6]. The total field estimated by proposed convex optimization method is E CVX n .…”

Section: Lossless Homogeneous Cylinder: = 11mentioning

confidence: 99%

An Approximation of 2-D Inverse Scattering Problems From a Convex Optimization Perspective

Liu

Han

Soldovieri

et al. 2022

IEEE Geosci. Remote Sensing Lett.

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We present a two-step strategy to solve an inverse scattering problem in 2-D geometry. The first step approximates the inverse scattering as a convex optimization problem and provides an estimation of the total field inside the domain under investigation without a priori knowledge or tuning parameters. In the second step, the previously estimated total field is used to reconstruct the unknown contrast permittivity, which is represented by a superposition of level-1 Haar wavelet transform basis functions. Subject to 1 -norm constraints of the wavelet coefficients, a least absolute shrinkage and selection operator (LASSO) problem that searches for the global minimum of the 2 -norm residual is exploited by accounting for the sparsity of the wavelet-based permittivity representation. Numerical results are presented to assess the effectiveness of the proposed formulation against objects with relatively small electric size. Finally, the approach is validated against experimental data.

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Section: Lossless Homogeneous Cylinder: = 11mentioning

confidence: 99%

An Approximation of 2-D Inverse Scattering Problems From a Convex Optimization Perspective

Liu

Han

Soldovieri

et al. 2022

IEEE Geosci. Remote Sensing Lett.

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“…This paper investigates the application of RF tomography (RFT) for the NDT evaluation of pillars, when a multiview/multistatic measurement configuration is exploited. RFT has been formerly applied to the underground imaging and tunnel detection [18], [19] and has been experimentally validated in [20], [21]. More recently, RFT has been proposed for the imaging of circular pillars and preliminary results were shown in [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Radio Frequency Tomography for Nondestructive Testing of Pillars

Negishi

Gennarelli

Soldovieri

et al. 2020

IEEE Trans. Geosci. Remote Sensing

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Pillars represent some of the commonest supporting elements of modern and historical buildings. Non-destructive testing methods can be applied to gain information about the status of these structural elements. Among them, ground penetrating radar (GPR) is a popular diagnostic tool for the assessment of concrete structures. Despite several theoretical and experimental studies on concrete structural evaluation by GPR have been reported, little work has been done so far in relation to pillars. Owing to their circular geometry, pillars are complex multi-scattering environments, which render the interpretation of the radar images very challenging. This paper deals with the application of radio frequency tomography as a non-destructive technique for imaging the inner structure of pillars. The main goal of the study is the assessment of the imaging performance that can be obtained in comparison to conventional ground penetrating radar exploiting a multi-monostatic configuration. Accordingly, potentialities and performance of multimonostatic and multiview/multistatic measurement configurations are herein investigated in the inverse scattering framework. For each measurement configuration, the regularized reconstruction of a pointlike target and the spectral content are evaluated. The data inversion is carried out by means of the Truncated Singular Value Decomposition scheme. Tomographic reconstructions based on full-wave synthetic data are shown to support the comparative analysis.

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“…In [28,29], the electromagnetic scattering tomography systems are implemented in an anechoic chamber to control the multipath effects. Since an anechoic chamber is not a feasible option for clinical applications, water is widely used as the background medium for electromagnetic scattering imaging systems to control the multipath effects and lower the contrast of the scatterer in [2, 6-11, 15, 21, 24, 25, 30, 31].…”

Section: Introductionmentioning

confidence: 99%

Millimetre‐wave multi‐view near‐field scattering tomography system

Shahir

Semnani

Mohajer

et al. 2018

IET Microwaves, Antennas & Propagation

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In a previous study by Shahir et al., the permittivity profile of object under test (OUT) from electric fields measured outside OUT is accurately estimated by considering the region of interest confined within the boundary of the OUT. This study proposes a continuous‐wave multi‐view near‐field scattering tomography system at the millimetre‐wave frequency range and reformulates the sub‐space approach for reconstructing the continuous‐wave tomographic images while considering the region of interest beyond the OUT boundary. The OUT reconstructed tomographic images enable one to localise the OUT boundaries. The proposed system also eliminates the need for fully systemic isolation (i.e. anechoic chamber) or water as a background medium by reducing multipath effects substantially at millimetre wave. The system performance is evaluated by reconstructing the tomographic images of various samples, and the experimental results are presented.

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RF Tomography in Free Space: Experimental Validation of the Forward Model and an Inversion Algorithm Based on the Algebraic Reconstruction Technique

Cited by 16 publications

References 14 publications

An Approximation of 2-D Inverse Scattering Problems From a Convex Optimization Perspective

An Approximation of 2-D Inverse Scattering Problems From a Convex Optimization Perspective

Radio Frequency Tomography for Nondestructive Testing of Pillars

Millimetre‐wave multi‐view near‐field scattering tomography system

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