Atmospheric effects on ultra high frequency radio propagation
atmosphericeffec00boud.pdf (4.440Mb)Abstract
The dependence of received power on range witnin and
belcvv atmospheric ducts was measured in conditions of
elevated, nonhomogeneous , multilayered ducts. An aircraft
with UHF transmitter covered the range to 150 nm. from a
shore based receiver. Range dependent maxima and minima
in received power were detected at tne surface in elevated
duct conditions. The results were compared to predictions
from ray, waveguide multi- mode, and single mode theories.
Ray and single mode theories were inadequate to
predict power patterns over the horizon. Multi-mode theory
yielded qualitative agreement for conditions of deep, low
elevated ducts. Agreement for higher, thinner ducts was
poor. Multilayered duct systems were observed and produced
interference patterns without recognizable period with
range.
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