The ITU vegetation model is a radio propagation model that estimates the path loss encountered due to the presence of one or more trees inside a point to point telecommunication link. The predictions found from this model is congruent to those found from Weissberger’s modified exponential decay model in low frequencies.
History edit
The CCIR, predecessor of ITU, adopted this model in the late 1986.
Applicable to/under conditions edit
- This model is applicable on the situations where the telecommunication link has some obstructions made by trees along its way
- This model is suitable for point-to-point microwave links that has a vegetation in their path.
- Typical application of this model is to predict the path loss for microwave links.
Coverage edit
Frequency: Not specified
Depth of Foliage: Not specified
Mathematical formulation edit
The model is formulated as:
Where
Points to note edit
This equation is scaled for frequency specified in megahertz (MHz).
The depth of foliage must be in the units of meters.
Limitations edit
The results of this model gets impractical at high frequencies.
See also edit
Further reading edit
Introduction to RF Propagation, John S. Seybold, 2005, John Wiley and Sons.