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Estimation of subrefraction statistics using surface synoptic meteorological data

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1 Author(s)
Harvey, R. ; Telecom Australia, Clayton, Australia

A companion paper developed a subrefractive fading model, in terms of a minimum effective k value, using surface synoptic meteorological data. The concept is extended here to cover the whole subrefractive event, so that using the effective k parameter k_{e} , analog radio systems can be simply designed. In the case of digital systems, severe subrefraction may cause outages due to thermal noise increase and this effect must be considered in design. For plains paths, where subrefraction risks are greatest, a method of estimating the shape of the k_{e} versus time curve of individual events by using correlations with surface synoptic meteorlogical data is given. By summation of time below each selected k_{e} value enables statistics of k_{e} to be produced. Examples of the method are given, and it is shown how regions of subrefraction may be defined.

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Antennas and Propagation, IEEE Transactions on  (Volume:35 ,  Issue: 7 )