Способ проактивной компенсации мешающих отражений при радиолокационном наблюдении малоразмерных объектов на фоне подстилающей поверхности

Abstract

The low probability of radar detection of a small-sized aircraft (MLA) is determined both by its small effective scattering surface of radio waves and by the presence of interfering (re-reflected) radio signals generated by the reflection of the radar sounding signal from the un-derlying earth's surface, against which the search and observation are carried out MLA. The power of such reflected signals can significantly exceed the power of the signals reflected from the MLA itself, and the multi-lobe nature of the radar antenna pattern further contrib-utes to masking the useful signal (reflections from the MLA) during its search. To increase the probability of radar detection of MLA, many different methods are used, associated with the formation of special probing signals, with various types of spatial and frequency filtering, with the development of special designs of antennas and antenna arrays. However, most of the methods used require rather complex technical solutions, the practical implementation of which is often impossible or excessively difficult. A method is proposed for increasing the probability of detecting MLA against the background of signals reflected from the relief by using a proactive method for calculating the interference field in the algorithms for second-ary processing of radar signals, based on the synthesis of a signal generated using a relief model of the underlying surface and compensation in the output signal. radar receiver com-ponent due to reflection from the terrain. The implementation of the proposed method is based on the use of the mathematical apparatus of the theory of radio wave propagation in the approximation of geometric optics. The requirements for the main characteristics of the digital model of the underlying surface and the resources of the computing device for the im-plementation of this method are given. An expert assessment of increasing the probability of detecting MLA is given. The results of the work can be used in on-board computing devices and radar systems for the tasks of detecting small aircraft, determining coordinates and pre-dicting their trajectory.