Characteristics of secondary radiation models of the MIG-29 multirole fighter and the MI-8MT multirole helicopter

The availability of data on the characteristics of aircraft secondary radiation allows solving several practical radar tasks. On the one hand, it is possible to carry out a set of measures to form a positional area for units that provide intelligence and combat information to units of anti-aircraft missile forces and fighter aircraft. On the other hand, it is possible to obtain information that allows to identify the areas of the object's surface that make a dominant contribution to the backscatter of the radar object as a whole. This makes it possible to evaluate the effectiveness of the proposed measures to optimise the secondary radiation characteristics of the entire object and its individual sections. The current level of development of computer technology makes it possible to solve this problem and implement sufficiently complex methods of mathematical modelling of secondary radiation from airborne objects with the necessary accuracy for practical use. The paper analyses existing methods for estimating the secondary radiation characteristics of airborne objects, which allow obtaining the secondary radiation characteristics of the MiG-29 multi-purpose fighter and Mi-8MT multi-purpose helicopter models. Methods based on integral representations of classical electrodynamics and their short-wave asymptotics have a number of advantages. The models of the surfaces of the MiG-29 aircraft and the Mi-8MT multipurpose helicopter were developed and the characteristics of the secondary radiation of the radar objects under study were calculated in the centimetre wavelength range. The results of calculating the characteristics of secondary radiation (radar cross-section, ‘incoherent’ radar cross-section, mean and median values of the radar cross-section) of the specified radar objects for different irradiation frequencies of the probing signal are presented. It was found that with increasing irradiation frequency, the average radar cross-section decreases, and the dependence of the radar cross-section on the irradiation angle becomes smoother. The obtained results can be used to assess the capabilities of radar systems for detecting, tracking and recognising airborne objects of this type. In addition, the use of the obtained results may allow to optimise