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Title: Duct-induced terrestrial microwave link degradation in Nigeria: Minimization factors
Authors: Oyedum, O D
Keywords: Surface duct;Shadow zone;Antenna height;Signal degradation;Link degradation;Link disruption;Terrestrial microwave path fading loss
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 41.20jb; 92.60.Ta
Abstract: Radio propagation at VHF and higher frequency bands are characterized by fading and anomalous enhancements associated with meteorological conditions. In particular, link disruptions on line-of-sight terrestrial microwave paths are often associated with fading losses that often depend on the height and position of the receiver as well as season of the year. Such propagation problems may be minimized by appropriate choice of the height and relative position of the transmitting and receiving antenna. Using results based on analysis of radiosonde data obtained during 1991-1999 for surface air temperature, pressure and relative humidity from the Nigerian meteorological stations of Lagos (06°28´N, 03°28´E), on the Atlantic coast of West Africa; and an inland city of Kano (12°02´N, 08°30´E), height-distance curves have been derived for estimating suitable heights and relative positions of antennas, to minimize fade losses on line-of-sight terrestrial paths during surface duct events. A detailed account of theoretical applications of such curves in both cities is also attempted.
Page(s): 339-347
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(3) [June 2012]

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