An approach to estimating the frequency characteristics of secondary radiation in an active-passive radar system with a non-operated light source

The analysis of works in the field of active-passive radar has shown interest in the development of such systems among both domestic and foreign specialists. In this paper, an active-passive radar with an uncooperated air-based illumination source is considered as an object. The evaluation of the frequency characteristics of the secondary from air targets against the background of the secondary from the underlying surface and the primary radiation of the illumination source is carried out based on the analysis of the spatial configuration of the system and the dynamics of its change. The assessment was carried out on the basis of an analysis of the dependencies between Doppler additions of radiation frequencies and the spatial configuration of the system, taking into account the dynamics of its change. As constraints, it is necessary to indicate that the estimates are obtained for a single-position system that is part of a multi-position suprasystem. As an indicator of the selection possibilities, the percentage ratio of the values of the ranges of the alternative arrangement of the spectra is proposed. It is shown that this assessment contains a system of many interrelated indicators, on the basis of which an approach based on a single integral indicator in the form of a percentage ratio of the values of the ranges of the alternative arrangement of the primary and secondary radiation spectra is proposed. The results obtained will allow us to further compile a system of initial data in the synthesis of adaptive algorithms for selecting moving targets in an active-passive radar with an uncooperated air-based illumination source, the purpose of which will be to reduce the threshold speed of selected moving objects of the location.