DocumentCode :
1036438
Title :
Hilly terrain LOS fadeouts and Fresnel zone considerations from ray tracing techniques
Author :
Rao, D. Narayana ; Murthy, M.J.Kesava ; Sarkar, S.K. ; Pasricha, P.K. ; Dutta, H.N. ; Reddy, B.M.
Author_Institution :
Sri Venkateswara Univ., Tirupati, India
Volume :
35
Issue :
11
fYear :
1987
fDate :
11/1/1987 12:00:00 AM
Firstpage :
1330
Lastpage :
1333
Abstract :
The Tiruttani-Tirupati communication link situated in hilly terrain operating in line of sight (LOS) mode at 7 GHz suffers severe fadeouts during early hours of the day in the months of February and March. To investigate if the fadeouts are due to insufficient obstacle clearance along the entire propagation path, an attempt has been made to determine whether the first Fresnel zone clearance is secured under varied atmospheric conditions. A computer program has been developed rising the ray tracing technique to trace the path of the radio ray under varied meteorological situations encountered during the early hours of the day when generally the fadeouts are observed in the microwave link. It is revealed that the fadeouts observed are due to insufficient clearance at the hill top usually during subrefractive conditions.
Keywords :
Geometrical optics (GO); Microwave radio propagation meteorological factors; Microwave radio propagation terrain factors; Antennas and propagation; Attenuation; Electromagnetic heating; Fresnel reflection; Microwave theory and techniques; Millimeter wave communication; Millimeter wave propagation; Millimeter wave technology; Rain; Ray tracing;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1987.1144004
Filename :
1144004
Link To Document :
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