Diffraction by Terrain Irregularities: A Review and New Results

This paper deals with the problem of wave propagation over irregular terrain. Two different ways to solve this problem is considered here. Specific diffraction models, each one associated to a given geometry (smooth spherical earth, rounded obstacles and terrain discontinuity) and a general solution represented by an integral equation. The adoption of one solution or another is closely related to the profile of the radio path which is being studied.