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Fast algorithms for electrically large objects buried in layered media are mainly hindered by two time-consuming processes. One is the table filling of Green's function, and the other is the solving of the impedance matrix equation. For the first, to accelerate the evaluation of the time-consuming Sommerfeld integral in the dyadic Green's function (DGF), the discrete complex image method (DCIM) is introduced to get a closed-form DGF. To further accelerate the calculation of DGF for the volume electric field integral equation (EFIE), DGF is split before applying DCIM. For the second, the iterative solver stabilized biconjugate gradient fast Fourier transform (BCGS-FFT) is combined with DCIM for solving the matrix equations. Meanwhile, the closed-form DGF enables the "spherical-mean" Green's function, which eliminates the singularity of Green's function. Numerical results show that the weaker singularity results in a faster and steadier convergence rate for iterative solvers
Published in:
Geoscience and Remote Sensing, IEEE Transactions on
(Volume:44
,
Issue:
12
)
Date of Publication: Dec. 2006
- Page(s):
- 3540 - 3546
- ISSN :
- 0196-2892
- INSPEC Accession Number:
- 9193886
- Digital Object Identifier :
- 10.1109/TGRS.2006.881124
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 20 November 2006
- Issue Date :
- Dec. 2006
- Sponsored by :
- IEEE Geoscience and Remote Sensing Society
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