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This paper is based on the application requirements of fully polarimetric radar for near ground and sea targets detection. We have used numerical modeling based on integral equation and multilevel fast multipole algorithm to study and calculate the fully polarimetric far field scattering data of simple manmade targets in a half space to conduct radar imaging. We also have compared the differences...
A simply constructed overlapped domain decomposition method based on the surface integral equation is presented. The buffer regions are limited to only a single layer of triangular mesh cells and the normal continuity of the currents across artificial boundaries is ensured by the Rao-Wilton-Glisson (RWG) basis functions defined over overlapped surfaces. Moreover, the overlapped currents belonging...
A novel sparse approximate inverse (SAI) preconditioner in multilevel fashion is proposed to accelerate the convergence rate of Krylov iterations for solving 3D electromagnetic scattering by integral equation. This multilevel formatted preconditioning is derived from the hierarchical data structure of hierarchical (H-) matrix, which overcomes the construction restrict of conventional SAI preconditioner...
The equivalence principle algorithm (EPA) is a kind of domain decomposition scheme for the electromagnetic scattering and radiation problems based on integral equation (IE). This method is suited for solving multi-scale problems and array structures with same elements. However, the original EPA can lead to a loss of accuracy in some cases. Compared with the EPA, Tangential EPA (T-EPA) has the better...
To calculate the scattering from thin dielectric-coated perfect electric conductor (PEC) surfaces, the impedance boundary conditions (IBC) and thin dielectric sheet (TDS) approximation are quite powerful in integral equation method because both remove the need to solve the field in dielectric layer. However, the rigid validation criteria restrict the application scope of IBC method. Although the TDS...
This paper presents a fast solution of electromagnetic scattering problems using the volume integral equation (VIE) combined with the integral equation fast Fourier transform (IE-FFT). The tetrahedron cells are used to model the geometry of the scatterer and the Schaubert-Wilton-Glisson (SWG) basis function is used to expand the electric flux density. A floating stencil topology is introduced to reduce...
In this paper, the integral equation fast Fourier transform (IE‐FFT) is implemented to solve the 3D full and partial coating scatterers. The real boundary condition is approximated by impedance boundary condition. The IE‐FFT is utilized to accelerate the matrix‐vector multiplication in the conjugate gradient (CG) iterative solver. And the Mesh Neighbor preconditioner is used to improve the iterative...
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