RADAR MEASUREMENT OF OBJECT SCATTERING CHARACTERISTICS IN THE PRESENCE OF A NATURAL BACKGROUND

Abstract

The article synthesized a procedure for radar simulation of the characteristics of a guarded object for the presence of a natural background. With the reception of the received signals from the object of the implementation of the process, the process of using the background in the backgroundlooks like falling of different intensity, which should fall. This ensures the reliability and reliability of radar information. Increasing the credibility and reliability of radar information about the object of remote surveillance is carried out by choosing the polarization of the sounding signal, as well as taking into account the differences in the polarization state of signals received from the object and the surrounding natural background under certain conditions of radar observation of the object. As informative parameters, the complete effective scattering surface of the object, obtained during successive irradiation of the object with an electromagnetic wave of four fixed polarizations in linear and circular bases, and the measurement of the coefficients of the scattering matrix of the object for each polarization of the irradiating wave were used. The polarization method of radar measurement of the object's scattering characteristics in the presence of an echo-signal of the atmospheric formation was established, which allows for radar observation of the object in difficult atmospheric conditions. When analyzing the results of radar measurements of the elements of the scattering matrix of an object when it is successively irradiated by electromagnetic waves of the four specified polarizations of the separation of the echo-signal of the object from the echo-signal of a complex object (object + atmospheric formation), coefficients K1, K2, K3 are used , equal to the ratio of the main components of certain polarizations of the irradiated wave, such as an unpolarized wave (using the coefficient S [11; H]), an electromagnetic wave of linear vertical polarization using the coefficient S [22; ВП] ), a linearly polarized wave with an inclination of the electric vector 45° (coefficient S [33; 45] ), an electromagnetic wave of circular polarization (coefficient S [44; k]). It is shown that if the object is located in the area of heavy precipitation, then its echo-signal is separated from the echo-signal of a complex object using the K3 coefficient, and when the object is located in the area of torrential precipitation, its echo-signal is separated from the echo -signal of a complex object is produced by coefficients K1, K2.