LINE-OF-SIGHT PROPAGATION EXPERIMENTATION AND MODELING FOR PARTIALLY ILLUMINATED TERRAIN
SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CA ELECTRONIC DEFENSE LABS
Pagination or Media Count:
A series of experiments was conducted to evaluate a model that predicts line-of-sight LOS propagation loss over partially illuminated terrain. Height-gain measurements were made at the receiver for a number of paths of varying irregularity, roughness, and vegetation cover. The measurements indicate that two regions must be recognized the first, below 500 Mc, where specular effects are predominant and the specular reflection coefficient varies from approximately 0.20 to unity and the second, above 500 Mc, where both the specular and the diffuse reflection coefficients generally range from 0.20 to 0.40. Appropriate changes have been made in the original LOS model to reflect more accurately the propagation effects in these two regions over the frequency range of interest, 40 Mc to 20 Gc.
- Radiofrequency Wave Propagation
- Radio Communications