Zhou Dongming

Analysis of scattering by combined conducting and dielectric objects using multi-region time domain integral equation scheme

Multi-region time domain integral equation is developed to analyze the electromagnetic scattering from three dimensional combined conducting and dielectric objects. In this paper, we use EFIE-PMCHM to solve the time domain integral equations. The problem is formulated in terms of a set of coupled integral equations involving equivalent electric and magnetic surface currents based on equivalence theorem. The conducting structures and the dielectric materials are modeled by planar triangular patches, RWG basis and Galerkin method are used. Numerical results are given for various structures and compared with other available data. The numerical results show that the present method has satisfying accuracy.

A hybrid TDIE-PO method for transient analysis of electrically large conducting objects

An hybrid method based on time domain integral equation (TDIE) coupled with physical optics (PO) is presented for the transient analysis of electrically large conducting objects. The matrix equation of marching-on in time (MOT) procedure is deduced. The numerical results demonstrate the validity and efficiency of the presented method.

Analysis of transient scattering from complex objects

A marching-on-in-time (MOT)-based time domain integral equation (TDIE) accelerated scheme is presented for the analysis of transient scattering from complex objects. The scheme employs the plane wave time domain algorithm (PWTD) to realize the efficient and fast evaluation of 3D transient wave field, thus reduce the computational complexity of MOT. The presented PWTD-enhanced MOT scheme renders feasible and rapid integral equation based analysis of transient scattering phenomena involving electrically large surface. The numerical results that demonstrate the accuracy and efficacy of this scheme are given in this paper.

Distributed Electromagnetic Computation Based on .NET Remoting

Electromagnetic scattering analysis present very large computational demands. Processing on LAN machines will contribute to increase the size of problem tractable. We present a parallel implementation of the time-domain integral equation method based on .Net Remoting. Numerical experiments proved that this method is effective.

A new singularity extraction technique for TDEFIE

A new singularity extraction technique is presented to calculate accurately the singular integrals in Time Domain Electric Field Integral Equation (TDEFIE). In singularity extraction procedure, through the aid of the first order Taylor series of time base function including time-retardation, the singularity of the integrand can be removed. The surface current density and backscattered far-field response of a conducting cube illuminated by a Gaussian plane wave is computed using the presented technique. Comparisons are made with the results obtained by the Inverse Discrete Fourier Transform (IDFT) of the frequency domain and the results obtained by using Vechinski’s time averaging technique, which demonstrate that the presented method with this new time domain singularity extraction technique to solve TDEFIE is very accurate and stable.

Study of comprehensive influencing factors on RCS in SAR imaging

In this paper, the influencing factors on RCS in SAR imaging are discussed in detail. By analyzing several terrain and system parameters, prior knowledge can be established on RCS interpretation of SAR in complex condition.