November 1971 | Technical Report OT/TRER 21
Analysis of Air-ground Radio Wave Propagation Measurements at 800 MHz
Cite This Publication
G. D. Gierhart et al., “Analysis of Air-ground Radio Wave Propagation Measurements at 800 MHz,” Technical Report OT/TRER 21, U.S. Department of Commerce, Office of Telecommunications, Institute for Telecommunication Sciences, November 1971.
Abstract:
An analysis is presented of air-ground radio wave propagation measurements, which were performed using an airborne transmission source at approximately 6,400 m above msl. Receiving antennas were slightly within and beyond line-of-sight of the airborne transmitters. Received signal level data were obtained on 82 3.75 MHz and 84 7.75 MHz. Data were analyzed for short-term and long-term statistics of basic transmission loss. Long-term fading range statistics were compared with values calculated using a modified Longley-Rice model and good (~1%) agreement was obtained. This model appears to underestimate the long-term median transmission loss by about 3 dB.
Keywords: air-to-ground propagation; propagation loss; tropospheric propagation; air-to-ground transmission
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