The IF-77 Electromagnetic Wave Propagation Model.
Abstract
This report provides a description of the computational details in the IF-77 radio wave propagation model. The IF-77 model is useful in estimating service coverage for radio systems operating in the 0l. to 20 GHz frequency range. It is applicable to many air/air, air/ground, air/satellite, ground/ ground, and ground/satellite systems. Irregular terrain and propagation beyond the line-of-sight range are considered in the model. However, the terrain feature is keyed to the lower (or facility) antenna and the radio horizon for the upper (or aircraft) antenna is (1) determined from the facility horizon obstacle (common horizon) or (2) taken as the smooth earth radio horizon when a common horizon is negated by the earth's bulge. Previous publications concerning IF-77 include (1) an applications guide for computer programs that use IF-77, (2) an extensive comparison of predictions made using IF-77 with measured data, and (3) an atlas of propagation curves applicable to aeronautical systems. Details concerning the computer programs are not included in this report. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1983
- Accession Number
- ADA134504
Entities
People
- G. D. Gierhart
- M. Johnson
Organizations
- Institute for Telecommunication Sciences