Air-to-Air Tropospheric Propagation Over Water
Abstract
Air-to-air tropospheric one-way radio wave propagation tests over smooth fresh water are described and the resulting data analyzed. Signal strength for frequencies of 250, 1000, and 3300 mc was recorded simultaneously in a receiving aircraft as a function of separation distance from a transmitting aircraft at 1000 feet altitude. Analyses include primarily those phenomena due to earth reflections, and, to a less extent, the effects of lower atmosphere refraction. The recorded interference lobe structure envelope compares favorably with the theoretical except for a maximum range foreshortening probably due to a substandard refractive condition. The indicated lobe rates and reflection coefficients closely compare with the theoretical with some scatter primarily due to rapid unavoidable excursions of aircraft altitude. Theoretical frequency dependent diffraction slopes calculated for signal strength beyond the horizon are closely duplicated in the data. No severe fades were observed that could not be attributed to earth reflection phenomena.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1952
- Accession Number
- ADA800019
Entities
People
- Fred P. Miller
- Garner B. Fanning
Organizations
- Wright Laboratory