Optimised Ray Tracing for the SuperNEC Implementation of the Uniform Theory of Diffraction
Date
2007-02-26T11:17:50Z
Authors
Hartleb, Robert
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Abstract
Geometric optimisations are presented for the UTD in SuperNEC which is a commercial electromagnetic
software package. Path finding optimisations rapidly find propagation paths of
electromagnetic waves by using back face culling to determine the visible plates of polyhedral
structures and by using reflection and diffraction zones which use image theory and the
law of diffraction to determine illuminated spatial regions. An octree reduces the number of
intersections during the shadow tests. Numerical results show that overall the optimisations
halve the run time of the software for models which consist of plates and cylinders. The
path finding optimisations do not scale with model size, are limited to plates and introduce
errors. The mean absolute error due to the path finding optimisations is on average 0:02 dB
for first order rays and 0:17 dB for second order rays. The octree optimisation scales with
model size, can be used with any geometry and any type of ray and does not cause errors.
Description
Student Number : 0006329K -
MSc(Eng) Dissertation -
School of Electrical and Information Engineering -
Faculty of Engineering and the Built Environment
Keywords
uniform theory of diffraction, geometrical optimisations, ray tracing