Assessment of Linear Sampling Method and Factorization Method for Through the Wall Imaging

Dogu, Semih; Akıncı, Mehmet Nuri

doi:10.1109/telfor.2018.8612025

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…where Γ is the arc on which the measuring antennas are located, Λ is the arc on which the exciting antennas are located, and D is the domain that is known to encapsulate the targets. Assuming that Γ = Λ and M antennas are used as transceiver and the sampling domain D is discretized into Q points {z 1 , z 2 , …, z Q }, the indicator function of the FM can be calculated as below [23,[31][32][33][34]36]:…”

Section: Factorization Methodsmentioning

confidence: 99%

“…For this reason, efficient quantitative inversion methods are being fulfilled recently [14][15][16][17][18]. On the contrary, qualitative MWI methods such as the linear sampling method [19][20][21][22][23][24][25][26][27][28], the orthogonality sampling method [27,29,30], the factorization method (FM) [6,23,28,[31][32][33][34][35][36][37], and the direct sampling method (DSM) [38] retrieve only shape and location information of the objects. The electrical features of the objects are not attained by such methods.…”

Section: Introductionmentioning

confidence: 99%

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Determination of electromagnetic source localization with factorization method

Karakiraz

Ertay

Gose

2021

Int. J. Microw. Wireless Technol.

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The factorization method (FM) is an attractive qualitative inverse scattering technique for the detection of geometrical features of unknown objects. This method depends on the selection of regularization parameters slightingly and has low calculation necessities. The aim of this work is to present a near-field FM for inverse source problems that have many applications. A modified test equation is obtained by converting the far-field term to Hankel's function. A different method has been proposed by manipulating the asymptotic approximation of Hankel's function in order to obtain near-field equations with incident angle and distance parameters. The novelty of this study is an integral equation based on the FM, which consists of multifrequency sparse near-field electric field measurements. We proved that the solution of the proposed integral equation gives information about the location of scatterers. The proposed algorithm is validated with simulation results and the capabilities of the presented method are assessed with several frequency regions and sources. Additionally, the presented method is compared with the direct sampling method in order to understand the performance of the proposed approach over a given scenario. The developed FM provides accurate results for electromagnetic source problems.

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Section: Factorization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of electromagnetic source localization with factorization method

Karakiraz

Ertay

Gose

2021

Int. J. Microw. Wireless Technol.

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“…The effectiveness of the proposed antenna is demonstrated with a through-the-wall (TWI) microwave imaging example. TWI applications are including but are not limited to searching firearms, tracking people for rescue operations, and locating the position of pipes behind the wall [2]- [5]. In TWI scenarios, mostly, reconstructing only the shape and the position of the objects is aimed due to the existence of the wall, which has the feature of absorbing electromagnetic fields and preventing them to reach the objects hidden behind the wall.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Dipole Antenna Design for Through-the-Wall Imaging on Security Applications

Joof

Dogu

Celik

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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This study proposes a dipole antenna with wideband characteristics for microwave imaging (MWI) applications. The wide-band characteristic of the antenna is achieved by reshaping the geometry of the conventional dipole. The dipole is fed by a specially designed balun, together with a ground reflector in order to obtain a high gain unidirectional pattern. The antenna is operating from 2.7 to 5 GHz with a maximum realized gain of 8.39 dBi and |S 11 | less than -10 dB within this frequency band. The simulation results and evolution of the design procedure are provided. Furthermore, a throughthe-wall MWI scenario consisting of thirteen antenna elements, a concrete wall, and two hidden objects behind the wall is implemented to evaluate the performance of the antenna. The 2-D reconstruction results obtained from inversion methods indicate that the proposed antenna is a potential candidate for throughthe-wall MWI applications.

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“…Another method, known as Orthogonality Sampling Method (OSM), similar to the LSM, is also applied to determine the shape of the anomalous target both for the far-field and near-field application [33]- [35]. Apart from this, Factorization Method (FM), Multiple Signal Classification (MUSIC), KA based shape reconstruction strategies, and many more can also be helpful in estimating the shape of the scatterer [36]- [39].…”

Section: Introductionmentioning

confidence: 99%

A Forward Scattering Model in Two-Dimensional Half-Space for Scatterers’ Size Estimation Using Linear Inversion

2022

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Analytic expressions of scattered electric fields for different categories of cylindrical targets buried in the half-space have been developed. In all the cases, investigation domains have been considered two-dimensional and are infinitely long in the remaining dimension. The investigation domains have been excited by the fields generated by a z-directed line source of constant amplitude, operating in the microwave frequencies. The usefulness and validity of these scattering models have been examined by inversion of the scattered electric field generated by the same. The inversion is based on the fact that the scattered field is mapped by a linear operator containing the induced current density and Green's function of the investigation domain. On application of the incident field, the presence of a discontinuity in half-space induces the current density. By using the information retrieved from the reconstruction of current density by inversion and analytical expressions of the scattered electric field, information about the diameter and the type of the scatterer have been obtained. In addition, the performance of the linear sampling method for shape reconstruction of the scatterer in half-space is also explored.

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Assessment of Linear Sampling Method and Factorization Method for Through the Wall Imaging

Cited by 7 publications

References 11 publications

Determination of electromagnetic source localization with factorization method

Determination of electromagnetic source localization with factorization method

A Wideband Dipole Antenna Design for Through-the-Wall Imaging on Security Applications

A Forward Scattering Model in Two-Dimensional Half-Space for Scatterers’ Size Estimation Using Linear Inversion

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