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- W1609690613 abstract "Abstract : This paper presents a practical method of computing radio fields in regions of strong focusing, using ray intercept data provided by a standard ray tracing program. The procedure extends the usefulness of the ray trace by allowing fields to be computed near caustics and cusps where ray density calculations fail. Using a plane wave decomposition of the field components, phase integrals are computed by curve fitting intercepts of ray traced through ionospheric or tropospheric media whose refractive indices vary arbitrarily with altitude. A numerical algorithm is described for performing the plane-wave angular spectral integrations. This procedure avoids the complications associated with higher order asymptotic techniques, allowing a much broader range of refractivity-index profiles to be analyzed by a single method. It is applied to two sample profiles, and the results agree very closely with higher order stationary-phase estimates in caustic regions. Moreover, the computer code runs efficiently, despite the presence of highly oscillatory integrands. The method is capable of including the effects of weak collisions, the spherical earth, and azimuthally dependent transmitter configurations. An extension of the angular spectral representations is given to include regions throughout the vicinity of a thin, overdense layer. (Author)" @default.
- W1609690613 created "2016-06-24" @default.
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- W1609690613 date "1982-03-01" @default.
- W1609690613 modified "2023-09-23" @default.
- W1609690613 title "A Numerical Method for Using a Ray Tracing Program to Compute Radio Fields in Regions of Strong Focusing." @default.
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