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Title: Microwave propagation studies and correlation with sodar structures observed over a hilly terrain in Southern India
Authors: Rao, D Narayana
Reddy, K Krishna
Ravi, K S
Rao, S V Bhaskara
Murthy, M J Kesava
Dutta, H N
Sarkar, S K
Prasad, M V S N
Reddy, B M
Issue Date: Dec-1992
Publisher: NISCAIR-CSIR, India
Abstract: Simultaneous observations of sodar echograms and microwave amplitude measurements are carried out to study radio wave propagatIon characteristics on a line-of-sight microwave link over a hilly terrain using an operational communication link between Tirupati and Tiruttani situated in Southern India. The studies show that convective conditions do not affect the microwave signal amplitude, whereas ground-based inversions of thickness < 100 m cause an average fade depth of 5 dB. The ground-based inversions of thickness > 100 m, multilayered structures and wave motions are mostly responsible for severe fading and cause deep fades of 20 dB or even more. The observed fade-outs are largely due to rising inversions, as they generate sub-refractive conditions in the convective region during the morning transition hours.
Page(s): 329-333
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.21(6) [December 1992]

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