HIGH-FREQUENCY METHODS FOR COMPLEX AIRBORNE RADAR OBJECTS SCATTERING CHARACTERISTICS CALCULATING

The current state of radar to perform detection and recognition tasks development requires knowledge of a priori information about the secondary radiation of radar objects characteristics. Obtaining this information concerning the target is possible by means of physical or mathematical modelling. Information concerning radar objects obtained by conducting field and physical experiments is associated with significant material, organizational and time costs. Therefore, the method of mathematical modelling can be considered as the most affordable way to obtain information on scattering characteristics. This paper evaluates modern high-frequency methods for the scattering characteristics (secondary radiation) calculating on complex airborne radar objects by mathematical modelling. The calculation of the objects scattering characteristics with surface breaks is carried out by preliminary dividing the surface into a smooth part and edge areas of the surface. The corresponding mathematical relations obtained can be used to estimate the secondary radiation of a complex airborne radar object. The article defines the possibilities of modern high-frequency methods for calculating the scattering characteristics of complex airborne radar objects using mathematical modelling, namely: calculation of scattering characteristics by a smooth surface of a complex airborne radar object; calculation of the scattering characteristics by the edge local surface areas with a radio-absorbing coating of a complex airborne radar object. The scattering characteristics of objects with surface breaks are calculated by first dividing the surface into a smooth part and edge areas. To calculate the scattered field, Kirchhoff-type integral representations are used. Thus, the integration surface covering the scattered in these integral representations is chosen to coincide with the object's surface everywhere except for some edge area. The corresponding mathematical relations for scattering characteristics calculating on smooth and edge localized surface areas of a complex airborne radar object are obtained. The presented calculation methods application can contribute to obtaining a priori information (as required by the current state of radar development) concerning the scattering characteristics of complex airborne radar objects, taking into account such complicating factors as the heterogeneity of the boundary surface, the presence of radio-absorbing coatings, and taking into account their complex effect.