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The offered model of radiowaves propagation of the unmanned aerial system data link is realized in two stages: calculation of middle radius of coverage area and his further elaboration by geometrical methods along the separate directions with the expressed relief inhomogeneities. Underestimation of this factor can be a reason of absence of receiving signal which leads to interruption of integrity of information, or can be an occasion of propagation of radiowaves beyond of destination area which creates a precondition of leaking or physical interception of information. The model allows to promote the level of informative integrity, availability and safety of data exchange due to a removal of propagation of radiowaves out of setting. Also it promotes reduction of probability of leaking and physical interception of information as well as retain of necessary level of availability and integrity of information. Index Terms-Coverage area; model of propagation of radiowaves; base station; terminal; availability of information; integrity of information; interception of information; leaking of information.

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