O. E. Kiryanov – Dr.Sc. (Eng.), Associate Professor, Head of Department,

Air Force Academy n.a. professor N.E. Zhukovsky and Y.A. Gagarin (Voronezh)

E-mail: olegkir@inbox.ru

V. A. Pon’kin – Dr.Sc. (Eng.), Professor, Chief Research Scientist,

Air Force Academy n.a. professor N.E. Zhukovsky and Y.A. Gagarin (Voronezh)

E-mail: ponkinvikarch@mail.ru

One of the main trends in the development of modern radar is to increase the radar resolution in range and angular coordinates. Antennas, due to structural features, have pronounced luminous points by which recognition (identification) of the antennas and the objects on which they are installed can be carried out. Therefore, in the general case, antennas should be considered as spatially extended objects, which are characterized not only by the effective scattering area, but also by local radar characteristics. In addition, the study of local scattering sources and the study of the mechanisms of their formation are important for solving the problem of reducing the radar visibility of antennas.

The mathematical model of estimation in a wide frequency range of local radar characteristics of cylindrical mirror antennas without and with use of means of decrease in visibility in the form of the radio absorbing coatings, the nonreflecting antennas loadings and the waveguide filters, frequency-selective screens has been developed. The mathematical model is based on the rigorous method of the integral equations and considers processes of irradiating and scattering of electromagnetic waves by mirror antennas with means of decrease in visibility. Local radar characteristics of mirror antennas with radomes are defined by processing of scattering fields on the discrete frequency spectrum.

With use of the developed mathematical model the theoretical estimation of local radar characteristics of mirror antennas with the radio absorbing coatings, the nonreflecting antennas loadings and the waveguide filters, frequency-selective screens for the superposed and diversity conditions of irradiating and receiving in the various frequency ranges has been carried out. The basic mechanisms of forming of local scattering sources of mirror antennas with radomes and decreases of their intensities at the expense of application of means of decrease in visibility have been determined.

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