PREDICTIONS OF TRANSHORIZON FIELD STRENGTHS USING MODELING TECHNIQUES
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
Pagination or Media Count:
Four propagation mechanisms are known which can cause detectable signal levels beyond the horizon. To investigate the potential of these mechanisms for causing interference, typical and extreme values were computed for models of the different propagation mechanisms, terrain diffraction, turbulent scattering, precipitation scattering, and ducting. The propagation path used for the model computations was 175 km long passing over irregular low lying terrain. The terminals of the path were taken to model a possible satellite earth station, radio relay station configuration. The radio relay station was assumed to have an antenna with a 2.5 deg half-power beamwidth. The earth station antenna was assumed to have a 0.5 deg half-power beamwidth. A wavelength of 5 cm was used for the computations.
- Radio Communications