Reflection Module
 
The Reflection module analyzes the variation in receive signal level on paths whose geometry can support a specular reflection.  The receive signal is calculated as a function of any of the following variables:  
Site 1 antenna height Site 2 antenna height
Frequency  Earth radius factor (K)
Tide level
The calculation starts by defining the end points of the reflective plane. The reflective plane can be constructed by any of the following means:  
  • a least squares fit of the terrain over the defined range 
  • a plane defined only by the end points 
 

The effects of divergence (the scattering of a reflected signal due to the curvature of the earth), terrain roughness, ground cover and clearance loss can be included in the calculation. The antenna discriminations are automatically factored into the results using the 3 dB beamwidths.

A dispersion worksheet shows a breakdown of the relative amplitude and delay of the reflected signal. Any of the parameters (frequency, antenna heights, K, beamwidths.. ) can be changed to determine the corresponding change in the reflected signal amplitude.
 

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Last Update: 08/06/99