Yu.N. Krivov, A.M. Lavrent'ev, E.E. Tsubanov, V.I. Shustov

In the article depending on a typical monopulse radar algorithm of aftertreatment of receiving device output radio-frequency signals on conditions that there is a single source of cross-polarized noise interference in the main directional lobe of the radar set is searched. Possibility in principle echo signal detection from a noise jammer is demonstrated and detection quality indexes received in the course of a statistical experiment by means of computer modeling are presented. Analysis of simulated results of the aftertreatment algorithm under consideration makes it possible to draw the following conclusions: 1. The algorithm under consideration makes it possible to establish data of forming of cross-polarized noise interference and to detect echo signal of noise jammer against its background on conditions used in the search process. 2. Accurate detection probability depends on relative intensity of an echo signal, an undesired signal on signal processing device input and on angular position of a noise jammer relative of normal to aperture plane of antenna. 3. Detection quality ratings are changed as a result of proper pattern levels changing (their lobe structure on copolarization and cross-polarization by reduction of angular deviation of a noise jammer and invariable other conditions. Availability of reciprocal fluctuations between a wanted signal in a total channel and an undesired signal in a differential channel ensures nonzero result forming on signal processing device output. The absence of an undesired signal in a total channel is the reason of desensitization of the algorithm used in simulation process. 4. The results presented in the research fit turndown of undesired signal intensity in the range qп = 20-50 dB. During the further growth of an undesired signal intensity there is no appropriate increasing of probability of accurate detection D. This is consequence of signal normalization of a total channel, realized by processing algorithm.