VHF/UHF propagation by diffraction: Calculation by numerical integration
Abstract
The method proposed here applies approximate diffraction theory to a terrain model that retains most of the complexity of the real terrain, and finds a solution to the diffraction problem for each particular transmission path profile. The method is to find the radio wave field as a function of height above each terrain point by integrating over the field above the preceding terrain point, using Huygen's principle. The integration is done not only for direct waves, but also for earthreflected waves.
 Publication:

In AGARD. Terrestrial Propagation Characteristics in Modern Systems of Communications
 Pub Date:
 November 1987
 Bibcode:
 1987tpcm.agar.....W
 Keywords:

 Numerical Integration;
 Radio Transmission;
 Terrain;
 Ultrahigh Frequencies;
 Very High Frequencies;
 Wave Diffraction;
 Wave Propagation;
 Estimates;
 Mathematical Models;
 Communications and Radar