VHF Propagation of Over Hilly, Forested Terrain
Abstract
We have made propagation measurements at low altitudes over hilly, forested terrain with the objective of developing a computer-based propagation model capable of predicting path loss given the terrain profile between transmitter and receiver. The measurements were made at a frequency of 110.6 MHz with the VOR station at Gardner, Massachusetts, as a transmitter. The received signal was measured at distances between 7 and 15 km by making vertical descents with a helicopter from altitudes of roughly 800 m down to 10 m above ground. We found good agreement between the measurements and model predictions based on an extension of the Deygout approximation. Use of two knife-edges was sufficient to characterize the terrain diffraction. Negligible multipath reflection was observed from this terrain.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 09, 1982
- Accession Number
- ADA115746
Entities
People
- M. L. Meeks
Organizations
- Massachusetts Institute of Technology