V.H.Avetisyan, A.K. Aharonyan, A.A. Sargsyan

A method for carrying out measurements to determine the parameters of ultrashort waveband antenna of weak directivity peculiar ti it in free space by the method of surface tests under the condition of the Earth mirror- reflection is considered and developed. The errors of determination of antenna gain are estimated. The obtained results are compared with simulation results.

V.H.Avetisyan, M.V.Markosyan, V.V. Grigoryan

«Antenny» (Antennas) №6 (205)2014

The reception problem depending on directional properties of transmitting and receiving antennas, and also on locations and properties of a set of the lumped reradiating objects is considered in the context of general problem of multipath propagation of waves. The problem is solved by the method named as the method of virtual antennas. The method is based on constructed equivalent model of reception in which the receiving antenna is replaced hypothetically by the set of virtual receiving antennas mutually spaced with accordance the beams falling on the replaced receiving antenna. the results arising from the obtained common decision in special cases are compared with the earlier known.

The device for measuring of the near-surface antenna parameters by flyby method.

Authors: M.V. Markosyan, V.H. Avetisyan, A.A Hovhannisyan, A.K. Aharonyan, A.A. Sargsyan

Method of the near-surface antenna directional pattern measurement by helicopter

Authors: M.V. Markosyan, V.H. Avetisyan, A.H. Nikoghosyan, A.A. Sargsyan

M.V.Markosyan, A.V. Simonyan. Yerevan State University of Architecture and Construction – BULLETIN No1, 2011, pages 103-111

A formal model of Mass Servicing System with one servicing device and limited waiting time as well as the analytical design thereof have been considered in the paper. The requirements for the operation of the system are defined and relevant formula have been brought out, through which one can estimate the first two moments of distribution of probabilities of losing task in the system because of limited wait time. It is assumed that the input flow of task is described by gamma distribution.