A.N. Krenev – Ph.D.(Eng.), Associate Professor, 

P.G. Demidov Yaroslavl State University

E-mail: krenev@uniyar.ac.ru

I.V. Chebotar – Dr.Sc.(Eng.), Scientific and Pedagogical Worker, 

Cherepovets Higher Military Engineering School of Radio Electronics

E-mail: cvviur6@mil.ru

P.E. Petukhov – Engineer,  

P.G. Demidov Yaroslavl State University

E-mail: petuhowpavel@yandex.ru

M.T. Baldychev – Ph.D.(Eng.), Scientific and Pedagogical Worker,  Cherepovets Higher Military Engineering School of Radio Electronics E-mail: cvviur6@mil.ru

Modern radar stations allow you to radiate and receive radio signals with arbitrary polarization. This allows us to expand the range of sounding signals used in practice in order to increase such important tactical characteristics of radar stations as information content and noise immunity. This article is about signals with additional polarization modulation or they can also be called signals with double modulation. In these signals, the argument of the carrier oscillation and the orientation angle of the polarization vector are independently modulated. This type of signal can be represented as a signal with linear polarization, the angle of which slowly changes with respect to the value of the carrier frequency. Research on the use of radar signals with additional polarization modulation and the development of algorithms for their processing is today a promising direction. Radiation and reception of such signals became possible with the advent of two-channel transmitting and receiving devices, the antenna systems of which consist of antennas with orthogonal linear polarizations. The main idea of using this type of sounding signals is to organize a full polarization scanning of the space and to provide the signal with a distinguishing feature, the rotation frequency of the polarization vector, which ensures its selection against the background of interference during reception and processing. The purpose of this article is to describe a linearly polarized interference suppression method in a full-polarized radar station using an additional polarized modulation signal as a probe. The study of the properties of this type of sounding signals is carried out by mathematical modeling methods. The article presents a mathematical model of the signal under investigation. Verification of the results of mathematical modeling and testing of digital processing algorithms are carried out experimentally on the dynamic bench of the semi-natural modeling of radar systems. This stand includes a pulsed programmable full polarization radar station, a jammer and auxiliary equipment providing modeling of various physical and radio-technical conditions. The article simulated the operation of a ground-based radar station under conditions of setting up intentional active interference with linear polarization. The results of modeling and experimental verification presented in the article show that it is possible to algorithmically separate the useful signal and linearly polarized noise according to the polarization criterion. The frequency of rotation of the polarization vector acts as a polarization feature. The linearly polarized noise in the frequency spectrum of the rotation of the polarization vector is concentrated in the region of zero frequencies, which allows it to be suppressed by standard methods of digital filtering. This effect confirms the possibility of using signals with additional polarization modulation to increase the noise immunity of radar stations to the effects of linearly polarized interference.

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