Abstract
The paper presents evaluation of atmospheric turbulence parameters (necessary for the design of tropospheric-scatter communication links and radar target identification and imaging resolution) from two different-indirect techniques. One method utilizes routine radiosonde observations: an empirical correlation between Vāisālā—Brunt frequency (a measure of thermal atmospheric stability and so deduced from radiosonde measurements) and refractive index fluctuations-spectral shape (slope) has been developed by Gjessing et al. It has been used to compute spectral slope over-different regions of the Indian sub-continent. The other method is through spectral analysis of tropospheric propagated signal fading. Spectral analysis of fading on a line-of-sight link between Delhi and Sonepat (LOS path ~42 km, frequency ~7.6 GHz) has been performed under varied meteorological conditions. Spectral slope is observed to be a characteristic representation of atmospheric structures present in the medium, and spectral intensity enables to determine Tatarskii's structure parameter Cnn2.
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