2D FDTD Simulation to Study Response of GPR Signals in Homogeneous and Inhomogeneous Mediums

Alsharahi, Gamil; Faize, Ahmed; Mostapha, Aye Mint Mohamed; Driouach, Abdellah

doi:10.15866/irecap.v6i3.9276

Cited by 5 publications

(5 citation statements)

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“…FDTD is based on the Yee algorithm [8], which solves both the magnetic and electric fields in time and space. Since it does not use a wave equation, it does not study these two fields separately [5,9,10,13]. Maxwell's equations [2]:…”

Section: Fdtd Methodsmentioning

confidence: 99%

Evaluation of the Iron State in Humid Zones Using GPR with 1.6 GHz Bowtie Antenna

Rihab¹,

Es-saleh²,

Lakrit³

et al. 2022

J. Nano- Electron. Phys.

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This report offers a study of iron status in moist zones using a 1.6 GHz Ground Penetrating Radar (GPR). The latter is a geophysical prospecting tool that analyzes the propagation, refraction, and reflection of high-frequency electromagnetic (EM) waves (from 300 MHz to 2.3 GHz). To replicate GPR signals, we used the GPRMAX program, which allowed us to model the soil's electrical and magnetic properties as well as the GPR itself. Several models were created to replicate various geological situations. The simulation began with a rectangular block as the starting model. The first and second models are basic profiles that illustrate the propagation of an EM wave. The third model is used to investigate the propagation of EM waves (reflected waves) in dry and wet concrete in order to demonstrate the influence of moisture on EM waves. To simulate different properties of a dielectric medium, a set of models was built. We simulated several different physical media using a finite difference time domain (FDTD) approach, which is the method on which the scientific calculation code of the GPRMAX simulation program is based. When a radar signal propagates through an environment, the presence of hyperbolas indicates the presence of buried objects.

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Section: Fdtd Methodsmentioning

confidence: 99%

Evaluation of the Iron State in Humid Zones Using GPR with 1.6 GHz Bowtie Antenna

Rihab¹,

Es-saleh²,

Lakrit³

et al. 2022

J. Nano- Electron. Phys.

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“…In Figure 2 shown, we adopt his intrinsic large signal taken from [17], [18]: Figure 2. Equivalent circuit of intrinsic large-signal model of MESFET Where the nonlinearities in this model are represented by gate-source capacitance and drain-source current [19], [20] :…”

Section: Far End Voltagementioning

confidence: 99%

Theoretical and experimental analysis of electromagnetic coupling into microwave circuit

Zerrouk¹,

Amellal²,

Amharech³

et al. 2019

IJECE

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<span lang="EN-US">In this paper, our work is devoted to a time domain analysis of field-to-line coupling model. The latter is designed with a uniform microstrip multiconductor transmission line (MTL), connected with a mixed load which can be linear as a resistance, nonlinear like a diode or complex nonlinear as a Metal Semiconductor Field-Effect Transistor (MESFET). The finite difference time-domain technique (FDTD) is used to compute the expression of voltage and current at the line. The primary advantage of this method over many existing methods is that nonlinear terminations may be readily incorporated into the algorithm and the analysis. The numerical predictions using the proposed method show a good agreement with the GHz Transverse Electro Magnetic (GTEM) measurement.</span>

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“…This lays the theoretical foundation for inversion analysis and helps to improve the interpretation and processing accuracy of GPR-measured data. At present, the most commonly used GPR forward simulation techniques include the finite element method (FEM) [17,18], the ray tracing method (RTM) [19,20], the method of moment (MOM) [21], the finite difference time domain method (FDTD) [22][23][24], the pseudospectral time domain method (PSTD) [25], and the symplectic algorithm [26][27][28], among others. Although research into GPR forward simulation has achieved fruitful results, these algorithms still have some limitations in terms of computational accuracy and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Modeling GPR Wave Propagation in Complex Underground Structures Using Conformal ADI-FDTD Algorithm

Wang

Lei

et al. 2022

Applied Sciences

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Ground Penetrating Radar (GPR) is a shallow geophysical method for detecting and locating subsurface targets. The GPR image echo characteristics of complex underground structures can be obtained by carrying out GPR forward modeling research. The traditional finite-difference time-domain (FDTD) method has low efficiency and accuracy. The alternating direction implicit FDTD (ADI-FDTD) algorithm surmounts the stability limitations of the traditional FDTD method, making it possible to select a larger time step for higher computational efficiency. For circular underground structures, a pseudowave produced by the ladder approximation method can be corrected using the surface conformal technique. This paper proposes a high-efficiency and high-accuracy GPR forward modeling method that combines the ADI-FDTD algorithm and surface conformal technology. The performance of the conformal ADI-FDTD algorithm is verified by a simple two-layer model. Based on the proposed algorithm, the GPR image features of three complex underground structure models are obtained. Finally, a field experiment is used to support the accuracy and usefulness of the conformal ADI-FDTD algorithm. The numerical simulation results and experimental results show that the conformal ADI-FDTD algorithm reduces the pseudodiffraction wave caused by the ladder approximation method and can significantly improve the computing efficiency for complex underground structure models.

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2D FDTD Simulation to Study Response of GPR Signals in Homogeneous and Inhomogeneous Mediums

Cited by 5 publications

References 0 publications

Evaluation of the Iron State in Humid Zones Using GPR with 1.6 GHz Bowtie Antenna

Evaluation of the Iron State in Humid Zones Using GPR with 1.6 GHz Bowtie Antenna

Theoretical and experimental analysis of electromagnetic coupling into microwave circuit

Modeling GPR Wave Propagation in Complex Underground Structures Using Conformal ADI-FDTD Algorithm

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