Diffraction overIrregular Terrain

Recommendation P.526

“Propagation by Diffraction”

• obstacle stylised as knife-edge

• Fresnel-Kirchoff theory

• allowance for rounded edges

• general method for multiple obstacles

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• ITU-R recommended method for diffraction.

• Obstacles (e.g. hills) stylised as knife edges

• Propagation loss according to well-known theory.

• Additional loss due to rounding.

• Multiple obstacle method based on Deygout construction limited to a maximum of three edges.