A Novel Piecewise Linear Recursive Convolution Approach for Dispersive Media Using the Finite-Difference Time-Domain Method
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In this article, two novel methods for implementing recursively the convolution between the electric field and a time dependent electric susceptibility function in the finite-difference time domain (FDTD) method are presented.Abstract:
Two novel methods for implementing recursively the convolution between the electric field and a time dependent electric susceptibility function in the finite-difference time domain (FDTD) method are presented. Both resulting algorithms are straightforward to implement and employ an inclusive susceptibility function which holds as special cases the Lorentz, Debye, and Drude media relaxations. The accuracy of the new proposed algorithms is found to be systematically improved when compared to existing standard piecewise linear recursive convolution (PLRC) approaches, it is conjectured that the reason for this improvement is that the new proposed algorithms do not make any assumptions about the time variation of the polarization density in each time interval; no finite difference or semi-implicit schemes are used for the calculation of the polarization density. The only assumption that these two new methods make is that the first time derivative of the electric field is constant within each FDTD time interval.read more
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Journal ArticleDOI
gprMax: Open source software to simulate electromagnetic wave propagation for Ground Penetrating Radar
TL;DR: gprMax is open source software that simulates electromagnetic wave propagation, using the Finite-Difference Time-Domain (FDTD) method, for the numerical modelling of Ground Penetrating Radar (GPR).
Journal ArticleDOI
A CUDA-based GPU engine for gprMax: open source FDTD electromagnetic simulation software
Craig Warren,Antonios Giannopoulos,Alan Gray,Iraklis Giannakis,Alan Patterson,Laura Wetter,Andre Hamrah +6 more
TL;DR: This work has developed one of the first open source GPU-accelerated FDTD solvers specifically focused on modelling GPR, and designed optimal kernels for GPU execution using NVIDIA’s CUDA framework.
Journal ArticleDOI
A Machine Learning-Based Fast-Forward Solver for Ground Penetrating Radar With Application to Full-Waveform Inversion
TL;DR: A novel near-real-time, forward modeling approach for GPR that is based on a machine learning (ML) architecture that combines a predictive principal component analysis technique, a detailed model of the GPR transducer, and a large data set of modeled GPR responses from the FDTD simulation software.
Proceedings ArticleDOI
An advanced GPR modelling framework: The next generation of gprMax
TL;DR: gprMax as discussed by the authors is a set of electromagnetic wave simulation tools based on the Finite-Difference Time Domain (FDTD) numerical method gprMax was originally written in the mid-1990s and has primarily been used to simulate Ground Penetrating Radar (GPR) to an extent that was not previously possible.
References
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Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media
Abstract: Maxwell's equations are replaced by a set of finite difference equations. It is shown that if one chooses the field points appropriately, the set of finite difference equations is applicable for a boundary condition involving perfectly conducting surfaces. An example is given of the scattering of an electromagnetic pulse by a perfectly conducting cylinder.
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Computational Electrodynamics: The Finite-Difference Time-Domain Method
TL;DR: This paper presents background history of space-grid time-domain techniques for Maxwell's equations scaling to very large problem sizes defense applications dual-use electromagnetics technology, and the proposed three-dimensional Yee algorithm for solving these equations.
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Advanced Engineering Mathematics
TL;DR: This book discusses ODEs, Partial Differential Equations, Fourier Series, Integrals, and Transforms, and Numerics for ODE's and PDE's, as well as numerical analysis and potential theory, and more.
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The Finite Difference Time Domain Method for Electromagnetics
Karl S. Kunz,Raymond J. Luebbers +1 more
TL;DR: In this paper, the authors define the fundamental concepts of scattered field FDTD and its application in a wide range of applications including: Coupling Effects Coupling effects Waveguide Aperture Coupling Lossy Dielectric Scattering Special Capabilities Far Zone Transformation Frequency Dependent Materials Surface Impedance Subcellular Extensions Nonlinear Loads and Materials Visualization Advanced Applications Far Zone Scattering Antennas Gyrotropic Media Mathematical Basis of FDTD, and Alternate Methods Difference Equations in General Stability, Dispersion, Accuracy Outer Radiation Boundary Conditions Alternate Formulations
Journal ArticleDOI
Advanced Engineering Mathematics.
Ronald F. Barnes,Erwin Kreyszig +1 more
TL;DR: In this article, the authors present an approach for ODE's Phase Plane, Qualitative Methods, and Partial Differential Equations (PDE's) to solve ODE problems.