A Numerical Method for Analyzing Electromagnetic Scattering Properties of a Moving Conducting Object

Abstract

A novel numerical approach is developed to analyze electromagnetic scattering properties of a moving conducting object based on the finite-difference time-domain (FDTD) algorithm. Relativistic boundary conditions are implemented into the FDTD algorithm to calculate the electromagnetic field on the moving boundary. An improved technique is proposed to solve the scattered field in order to improve the computational efficiency and stability of solutions. The time-harmonic scattered field from a one-dimensional moving conducting surface is first simulated by the proposed approach. Numerical results show that the amplitude and frequency of the scattered field suffer a modulation shift. Then the transient scattered field is calculated, and broadband electromagnetic scattering properties of the moving conducting surface are obtained by the fast Fourier transform (FFT). Finally, the scattered field from a two-dimensional moving square cylinder is analyzed. The numerical results demonstrate the Doppler effect of a moving conducting object. The simulated results agree well with analytical results.

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“…1 Since five decades, many developments are done in the field of electromagnetic scattering from dynamic objects such as scattering analysis in one-dimensional, two-dimensional, three-dimensional cases, [1][2][3][4] scattering analysis due to symmetric and nonsymmetric rotating system, [5][6][7][8][9][10][11] scattering due to vibrating object. [12][13][14][15][16] Many computational techniques are developed to incorporate scattering phenomenon due to dynamic targets such as Lorentz transformation based computational platform 2,[15][16][17]25 where the source signal is transformed to moving frame using Lorentz equation and scattering analysis is done in moving frame by considering the moving object as stationary. Further, the scattered signal is transformed back to laboratory frame using inverse Lorentz transformation.…”