R. Akbarpour and A.R. Webster (Canada)
Microwave propagation, modeling, multipath fading, delays
This experimental microwave link was operated for several consecutive years in Ontario during the fading season, May to September [8]. Regularly recurring features during the fading periods included strong elevated rays due to the occurrence of elevated layers, and somewhat a weaker elevated main ray on occasion associated with a ground-based layer. Weak ground reflected rays were also evident. An example of severe fading is shown in Fig. 1 in which the early fading (before about 01.00) is consistent with the occurrence of a ground based layer resulting in a weak elevated main ray interacting with ground reflected rays. Later, up until dawn, the fading seems to be associated with elevated layers where a more-or-less normal direct ray is accompanied by several elevated rays. A parabolic equation approach is used to examine the performance of an experimental line-of-sight tropospheric microwave link in the presence of atmospheric layers. Simulations are presented to show the propagation effects on angle-of-arrival, amplitude and time delay of individual ray components at the receiving antenna under anomalous multipath propagation.
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