Hybrid PE-Ray-Mode Formulation of High Frequency Propagation in a Bilinear Tropospheric Surface Duct,
NATIONAL DEFENSE ACADEMY YOKOSUKA (JAPAN)
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Prediction of signal strengths due to high frequency sources in the presence of a tropospheric surface or elevated duct poses a problem of substantial complexity because the propagation environment is generally heterogeneous in height as well as in the lateral domain. A prediction algorithm should not only furnish adequate accuracy but also incorporate a parametrization in terms of physical observables so that the output can be properly interpreted. Relevant physical observables include ray fields, normal trapped and leaky mode fields, and beam-like parabolic propagators. These observables are employed here in self-consistent hybrid combination to model propagation in a laterally homogeneous surface duct with bilinear refractive index profile in height. A reference solution, which has been generated by normal and leaky mode summation, is interpreted qualitatively in terms of the corresponding ray field plot. Work is in progress on a quantitative reconstruction of the reference data via the hybrid algorithm.
- Radiofrequency Wave Propagation