NDLI: Air-to-ground propagation at 900 MHz

Content Provider	IEEE Xplore Digital Library
Author	Child, J.R.
Copyright Year	1985
Description	Author affiliation: Telecommunications Consultant, Falls Church, Virginia (Child, J.R.)
Abstract	Air-to-ground propagation at 900 MHz exhibits some fading characteristics similar to land-based mobile radio systems and others similar to terrestrial line-of-sight microwave systems. 900 MHz air-to-ground propagation, over long distances and at low vertical look angles, is governed primarily by obstacles blocking the path. At shorter distances the signal sometimes experiences multipath fading. The level varies slowly as the aircraft passes in and out of fresnel zones. When the aircraft is over a ground station, the signal experiences rapid fading similar to land mobile systems. At 900 MHz, with a limited fade margin, the radio horizon is approximately equal to the optical horizon. The horizon can be documented in a variety of ways simplifying the coverage prediction process. Several procedures are discussed with emphasis on a photographic technique which offers the greatest accuracy.
Starting Page	73
Ending Page	80
File Size	704442
Page Count	8
File Format	PDF
DOI	10.1109/VTC.1985.1623334
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-05-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Amplitude modulation Circuit stability Reflection Channel spacing Doppler shift Costs Military aircraft Reflector antennas Directive antennas
Content Type	Text
Resource Type	Article

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