Ray Structure of Ducted Multipath for an LOS Link.
SYRACUSE UNIV N Y DEPT OF ELECTRICAL ENGINEERING
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This report describes the geometric optic analysis of a duct model for line-of-sight LOS fading. The atmospheric refractive index is molded by three linear segments so as to form an elevated duct. The earths curvature is taken into account by using the modified refractive index. Simple approximate formula are developed for the number of geometric-optic rays received for a given link length. In addition, the angle of departure from the transmitter of these rays is calculated. The angles enable one to readily calculate the amplitude and phase of contributing rays. To gain insight into the structure of the ray families, the trajectories of trapped rays are plotted. We have found that two cusps exist, each cusp having two caustics associated with it. Author
- Atmospheric Physics
- Radiofrequency Wave Propagation