V. B. Avdeev, A. N. Katrusha

In article the actual problem of prediction of indoor resultant fields solves at propagation of VHF radio waves from street in a multistorey building. On the basis of application of the uniform geometrical theory of the diffraction, allowing to consider arising multipath propagation, the new design procedure of levels of loss of signals of mobile VHF radio communication (or jamming signals) is developed at their passage in a multistorey building. At prediction of resultant fields in a room are considered following groups of beams (components): beams of primary diffraction on edges of a window aperture; the through beams extending through walls and interfloor overlappings of a building. The analysis of the received results has allowed to draw following basic conclusions: - depending on removal of the transferring antenna from a building there is a domination of one of a component or their competition; - loss of radio waves at distance increase can in some areas of space and decrease, that leads to increase in level of the electromotive force induced in the reception antenna at removal of the transferring antenna from a building. The reason of such non-uniform change of level of loss consists in variable influence through and diffraction component, and also a difficult configuration of radio lines which at removal of the transferring antenna become closer to open type. The received results can be used also at planning and organization of mobile VHF radio communication or local jamming of a mobile radio communication at placing of one subscriber MS in a multistorey building.