Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 1 : theory
A tunnel is modeled as congregates of walls, with the wall being approximated by uniform impedance surface. The aim is to get a solution for a canonical problem of a wedge with uniform impedance surface. The...
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Main Authors: | , , |
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格式: | Article |
語言: | English |
出版: |
2010
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在線閱讀: | https://hdl.handle.net/10356/90770 http://hdl.handle.net/10220/6306 |
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總結: | A tunnel is modeled as congregates of walls, with
the wall being approximated by uniform impedance surface. The
aim is to get a solution for a canonical problem of a wedge
with uniform impedance surface. The diffraction by a rightangle
wedge with different impedance boundary conditions at
its two surfaces is first considered. A functional transformation
is used to simplify the boundary conditions. The eigenfunction
solutions for the transformed functions are replaced by integral
representations, which are then evaluated asymptotically by the
modified Pauli–Clemmow method of steepest descent. The asymptotic
solution is interpreted ray optically to obtain the diffraction
coefficient for the uniform geometrical theory of diffraction
(UTD). The obtained diffraction coefficients are related directly to
Keller diffraction coefficients in uniform version. The total field
is continuous across the shadow of the geometrical optics fields. |
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