A time-domain differential solver for electromagnetic scattering problems
Article Abstract:
Computational fluid dynamics (CFD) up wind based algorithms are used to develop a time-domain differential solution for Maxwell's equations for electromagnetic scattering from complex objects with layered non-metallic components. The analysis of return (scattered) radar data from a target object in order to gain radar cross section (RCS) information on regions with dielectric and magnetic properties different from free space can be accomplished by CFD because CFD equations are usually in a conservation form, enabling analysis of discontinuities; up wind schemes for hyperbolic equations can provide computational stability and accuracy, CFD body-fitted coordinate systems are useful for complex geometries; and CFD offers proven procedures for solving nonlinear CFD equations. Details of the theory and application of CFD algorithms to object recognition and analysis are given.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
User Contributions:
Comment about this article or add new information about this topic:
Review of FD-TD numerical modeling of electromagnetic wave scattering and radar cross section
Article Abstract:
The finite-difference time-domain (FD-TD) solution of Maxwell's curl equations offers a methodology for the numerical modeling of such electromagnetic wave interactions as scattering and radar cross section (RCS) in target objects. The modeling of complex objects requires sampling at sub-wavelength resolution to avoid such problems as aliasing of magnitude and phase information. The FD-TD methodology applies second-order central-difference approximations of the space and time derivatives of the electromagnetic fields to the differential operators of the curl equations. The methodology is validated through the modeling of a variety of canonical two- and three-dimensional targets and very complex aerospace and biological objects. Supercomputers and concurrent multiprocessors are natural hosts for FD-TD processing.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
User Contributions:
Comment about this article or add new information about this topic:
Electromagnetic Wave Propagation and Scattering in Rain and Other Hydrometeors
Article Abstract:
Rain and other hydrometeors can cause degradation of communications links on microwaves and millimeter waves. The characteristics of the hydrometeors must be known to calculate the effects on advanced technology communication. Subjects investigated include attenuation, cross polarization, depolarization cancellation, rain scattering, and other scattering effects. Graphs, photographs, and diagrams present data.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1983
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: National Science Foundation/Engineering Research Center for Emerging Cardiovascular Technologies. Measurement of defibrillation shock potential distribution and activation sequences of the heart in three dimensions
- Abstracts: Ballistic electron transport in semiconductor heterostructures and its analogies in electromagnetic propagation in general dielectrics
- Abstracts: Wave propagation and scattering in random media and rough surfaces. Wave Propagation Through Random Media: Contributions from Ocean Acoustics