Bulg. J. Phys. vol.25 no.3-4 (1998), pp. 181-187

A Clear-Air Propagation Prediction System: Evaporation Duct Application

I. Sirkova
Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
Abstract. This work presents some results obtained by a programme designed for assessment/prediction of microwave propagation in the lower troposphere under ground-based ducting conditions. As an example of ground-based duct the evaporation duct has been used. It has been shown that the commonly occuring evaporation ducts may cause substantial distortions of the channel transfer function in microwave ranges. The influence of the duct strength changes on path loss pattern has been pointed out too.

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