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      •   BUIR Home
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      • Bilkent Theses
      • Theses - Department of Electrical and Electronics Engineering
      • Dept. of Electrical and Electronics Engineering - Master's degree
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      Implementation of physical theory of diffraction for radar cross section calculations

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      Author(s)
      Öztürk, Alper Kürşat
      Advisor
      Altıntaş, Ayhan
      Date
      2002
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
      Item Usage Stats
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      Abstract
      A computer program which uses the Physical Theory of Diffraction (PTD) method to calculate the Radar Cross Section (RCS) of perfectly conducting targets with arbitrary shape is developed. Given an arbitrary surface, it is first meshed using planar triangles. The area of each triangle is restricted to be smaller than 0.005λ 2 in order to obtain a good approximation to the actual surface. After meshing, Physical Optics (PO) surface integral is numerically evaluated over the whole surface. If the surface has edges or wedges, diffractions originating from these edges play a significant role in the overall scattered field. This part of the diffracted field is calculated using PTD-EEC method. Calculation of the edge currents is made possible by canonically modelling the arbitrary-shaped edge. If the surface of the scatterer has thin wires attached to it, then the thin wire scattering formulation in the literature is applied. Expressions for scattering mechanism on a straight wire are based on diffraction, attachment, reflection and launch. The results get sufficiently accurate especially for electrically large bodies.
      Keywords
      Physical Theory of Diffraction (PTD)
      Triangular Surface Meshing
      Physical Optics (PO)
      Physical Theory of Diffraction-Equivalent Edge Currents (PTD-EEC)
      Radar Cross Section
      Scattering by Thin Wires
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      http://hdl.handle.net/11693/15686
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      • Dept. of Electrical and Electronics Engineering - Master's degree 655
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