ELECTROMAGNETIC ANALYSIS ALGORITHM

MOM3D is a FORTRAN method-of-moments electromagnetic analysis algorithm for
open or closed 3-D perfectly conducting or resistive surfaces. Radar cross
section with plane wave illumination is the prime analysis emphasis;
however, provision is also included for local port excitation for
computing antenna gain patterns and input impedances. The Electric Field
Integral Equation form of Maxwell's equations is solved using local
triangle couple basis and testing functions with a resultant system
impedance matrix. The analysis emphasis is not only for routine RCS
pattern predictions, but also for phenomenological diagnostics: bistatic
imaging, currents, and near scattered/total electric fields. The images,
currents, and near fields are output in form suitable for animation. MOM3D
computes the full backscatter and bistatic radar cross section
polarization scattering matrix (amplitude and phase), body currents and
near scattered and total fields for plane wave illumination. MOM3D also
incorporates a new bistatic k space imaging algorithm for computing down
range and down/cross range diagnostic images using only one matrix
inversion. MOM3D has been made memory and cpu time efficient by using
symmetric matrices, symmetric geometry, and partitioned fixed and variable
geometries suitable for design iteration studies. Geometries are described
using a triangular mesh input in the form of a list of spatial vertex
points and a triangle join connection list.

MOM3D is written in FORTRAN 77. Two machine versions are available from
COSMIC: the UNIX version is designed to run on SGI series computers
running IRIX, and, with modifications that are described in the
documentation, has been successfully implemented on a Sun4 series computer
running SunOS; the IBM PC version has been successfully implemented on an
IBM PC compatible running MS-DOS and Lahey FORTRAN v5.1-EM32.

NASA's Software Technology Transfer Center
COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
(706) 542-3265;  Fax: (706) 542-4807
Internet Email: service@cossack.cosmic.uga.edu

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