Accession Number:

ADA426492

Title:

Well-Conditioned Multi-Level Fast Multipole Modeling of Military Communication Channels

Descriptive Note:

Final rept. 1 Jun 2001-31 May 2004

Corporate Author:

DUKE UNIV DURHAM NC DEPT OF ELECTRICALENGINEERING

Personal Author(s):

Report Date:

2004-08-30

Pagination or Media Count:

7.0

Abstract:

Duke University and Virginia Polytechnic Institute and State University VPISU propose to team in a research effort to develop computer codes for the analysis and prediction of electromagnetic wave EM propagation over terrain. Those features of the terrain to be included are geographic scales of surface elevation, surface roughness, variable electrical constitutive properties, and vegetation cover e.g., single and multiple trees. The frequencies to be considered include those of greatest interest to the U.S. Army in their current and projected communications and remote sensing needs. The approach will focus on the solution of appropriate integral equations describing the interaction of the EM waves and the terrain. Both institutions will work on developing the most appropriate integral equations to describe generic propagation scenarios. In the numerical solution of these integral equations, VPISU will concentrate on preconditioning or renormalizing them so as to minimize the number of iterations necessary to solve them to a given level of accuracy. Duke will focus on developing improved fast solvers for the preconditioned equations based upon their previous work with the Multi-Level Fast Multipole Algorithm MLFMA. Both organizations also will attempt to keep the developed methods and codes general to the extent that they also may be applied to propagation in an urban environment. The rigorous, well-conditioned MLFMA models will be used as benchmarks to calibrate the accuracy of traditional electromagnetic propagation models, including ray, beam, and parabolic-equation PE solvers. 10 refs.

Subject Categories:

  • Numerical Mathematics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE