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 01 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.
- Publication:
-
Final Report Institute for Telecommunication Sciences
- Pub Date:
- September 1983
- Bibcode:
- 1983its..rept.....G
- Keywords:
-
- Computer Programs;
- Electromagnetic Wave Transmission;
- Line Of Sight Communication;
- Radio Transmission;
- Wave Propagation;
- Aeronautical Satellites;
- Communication Satellites;
- Diffraction Paths;
- Horizon;
- Models;
- Scattering;
- Spacecraft Communication;
- Terrain;
- Transmission Loss;
- Communications and Radar