The article discusses the possibility of detecting radar targets moving under the cover of active noise masking interference, acting along the main lobe of the antenna system's radiation pattern, and also using self-covering noise. It is shown that in radar stations with full polarization sounding of the space and measurement of the polarization scattering matrix (PSM), it is possible to synthesize a decisive rule for target detection against active noise-free correlated interference. This synthesis is possible on the basis of the determinant of the polarization scattering matrix, the value of which has the properties of invariance to the form of the polarization scattering vector. The analysis of the determinant of the polarization scattering matrix in the conditions of measuring its elements against the background of active interference makes it possible to identify differences in the values of the determinant under conditions of presence and absence of a target in the volume of space allowed by the radar system. In this case, the value of the determinant becomes the main information feature. A distinctive feature of the detector is the invariance to the form of the polarization scattering vector. The detector synthesis is based on differences in the signals of the secondary and primary radiation, which appear at the output of the PSM meter, namely, on the properties of the determinant of the polarization matrix of the scattering of the object and the signal received from the source of active interference. The purpose of the article is to illustrate the differences in the properties of the polarization scattering matrix at the output of the PSM meter in the presence of active interference and / or a useful signal, as well as the possibilities of using the existing differences in the properties of PSM and their estimates in the presence of active interference for the synthesis of a radar detector.

At present, the scientific and technical literature discusses in detail the issues of obtaining information about the geometric characteristics of airborne radar targets (RC), which can be used as recognition signs. However, these issues and the methods being developed are considered in relation to single-position radar stations (radars) using simple or complex signals. Purpose of the work is determination of the informative value of the parameters of the long-range portraits of the RLS obtained by the method of statistical and physical modeling based on the processing of experimental data. A method is proposed for assessing the informativeness of long-range portraits of radar objects obtained as a result of processing reflected signals by various methods, including using weight processing based on a priori information about the structure of probing signals. Based on the analysis of the experimental data, it was found that the weight processing of the long-range portraits of the RLS provides an increase in the contrast of the portraits (an increase in the steepness of the portrait peaks and the depth of the dips), which, in turn, leads to an increase in the information content of each element of the long-range portrait and the totality of the features of the long-range portrait as a whole when recognizing RLO. The use of the technique allows us to assess the quality of the long-range portraits of the radar, obtained by various methods of processing radar signals and develop algorithms that increase the information content of radar systems with the recognition mode both for air and space radar and for objects against the background of the underlying surface during remote sensing.