Abstract
An efficient time domain shooting and bouncing ray (TDSBR) method is proposed to analyze the transient near-field scattering from an electrically large complex object illuminated by a far-field antenna source. The time-domain far-field incident sources can be derived by a convolution of pulsed excitation with the inverse Fourier transform of frequency domain (FD) far-fields radiated from an antenna. In order to obtain accurate near-field scattering results, time domain physical optics (TDPO) near-field integral representations are proposed and reduced to closed-form expressions to improve computing efficiency by applying locally expanded Green function approximation. Different from the plane wave incident situation, in the case of antenna radiation, the incident fields of each individual facet in the ray path are represented by the radiation fields from the equivalent mirror antenna derived in this paper. Since the radiation fields naturally contains the time delay term, the complicated processing of the time delay problem can be avoided by solving the equivalent mirror antenna radiation fields. It is simpler and more accurate than the traditional time domain geometrical optics (TDGO) method. Numerical examples are presented to demonstrate the efficiency and accuracy of the proposed method.
Highlights
With the widespread application of short-pulse communication and ultra-wideband radar systems in target detection, target recognition and remote sensing, the time-domain electromagnetic scattering analysis of targets has become one of the focuses in computational electromagnetics
This paper proposed an efficient time domain shooting and bouncing ray (TDSBR) method to analyze the transient near-field scattering from electrically large complex objects illuminated by a far-field antenna source
Numerical analyses show that the proposed method performs good accuracy for the analysis of near-field transient scattering problem when compared with the multilevel fast multipole algorithm (MLFMA)
Summary
With the widespread application of short-pulse communication and ultra-wideband radar systems in target detection, target recognition and remote sensing, the time-domain electromagnetic scattering analysis of targets has become one of the focuses in computational electromagnetics. In FD, Gordon [4] reduced the far-field PO surface integral on a flat polygonal to a closed-form expression to improve the computational efficiency. Inspired by Legault’s method, Zhou and Cui [7] derived the TDPO surface integral expressions of scattering near-fields and reduced the surface integral expressions on a flat polygonal to closed-form expressions under pulsed plane wave incident. In 2015, Zhou et al [21] presented a TDSBR method based on the beam tracing (BT) technique [22]–[24] to analyze the transient scattering responses from large PEC objects illuminated by a pulsed plane wave. In this paper, inspired by Zhou and Cui [7], TDPO near-field integral representations are proposed and reduced to closed form expressions to investigate the transient scattered near-fields from targets illuminated by farfield antenna sources.
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