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Ray-tube integration in shooting and bouncing ray method revisited

Poulsen, Soren LU (2021) 34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021 In General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS
Abstract

The method of shooting and bouncing rays (SBR) was originally developed for radar cross section (RCS) analysis of aircraft engines, but is today widely used in many applications requiring high-frequency approximations. A dense grid of ray-tubes are launched from the source and traced by the laws of geometrical optics (GO) until they reach a defined exit aperture, from which the far field contribution of the ray-tube is obtained by surface integration. Two alternatives have been suggested on where to perform the surface integration, namely (1) on the ray-tube cross-section or (2) on the exit aperture. The first option is convenient as the electrical field is assumed constant in the ray-tube surface and has been suggested for complex... (More)

The method of shooting and bouncing rays (SBR) was originally developed for radar cross section (RCS) analysis of aircraft engines, but is today widely used in many applications requiring high-frequency approximations. A dense grid of ray-tubes are launched from the source and traced by the laws of geometrical optics (GO) until they reach a defined exit aperture, from which the far field contribution of the ray-tube is obtained by surface integration. Two alternatives have been suggested on where to perform the surface integration, namely (1) on the ray-tube cross-section or (2) on the exit aperture. The first option is convenient as the electrical field is assumed constant in the ray-tube surface and has been suggested for complex scattering problems. In this paper, it is demonstrated that the surface integration over the ray-tube area can cause a ripple anomaly. It is illustrated that the ripple is caused by omitting parts of the integration surface from which there are no power flow. It is concluded that exit aperture integration should be selected in SBR analysis.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
2021 34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021
series title
General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021
conference location
Rome, Italy
conference dates
2021-08-28 - 2021-09-04
external identifiers
  • scopus:85118267503
ISSN
2642-4339
ISBN
9789463968027
DOI
10.23919/URSIGASS51995.2021.9560549
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021 URSI.
id
35e85188-4e4b-48a8-9922-19857abbe4b4
date added to LUP
2021-11-16 12:30:44
date last changed
2022-04-27 05:43:43
@inproceedings{35e85188-4e4b-48a8-9922-19857abbe4b4,
  abstract     = {{<p>The method of shooting and bouncing rays (SBR) was originally developed for radar cross section (RCS) analysis of aircraft engines, but is today widely used in many applications requiring high-frequency approximations. A dense grid of ray-tubes are launched from the source and traced by the laws of geometrical optics (GO) until they reach a defined exit aperture, from which the far field contribution of the ray-tube is obtained by surface integration. Two alternatives have been suggested on where to perform the surface integration, namely (1) on the ray-tube cross-section or (2) on the exit aperture. The first option is convenient as the electrical field is assumed constant in the ray-tube surface and has been suggested for complex scattering problems. In this paper, it is demonstrated that the surface integration over the ray-tube area can cause a ripple anomaly. It is illustrated that the ripple is caused by omitting parts of the integration surface from which there are no power flow. It is concluded that exit aperture integration should be selected in SBR analysis.</p>}},
  author       = {{Poulsen, Soren}},
  booktitle    = {{2021 34th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2021}},
  isbn         = {{9789463968027}},
  issn         = {{2642-4339}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS}},
  title        = {{Ray-tube integration in shooting and bouncing ray method revisited}},
  url          = {{http://dx.doi.org/10.23919/URSIGASS51995.2021.9560549}},
  doi          = {{10.23919/URSIGASS51995.2021.9560549}},
  year         = {{2021}},
}