UDC 621.391,621.396,621.369

Authors

V. A. Pakhotin
Doctor of physical and mathematical sciences, Professor of the Institute of Physical Technical Sciences and Information Technologies of the Immanuel Kant Baltic Federal University, Kaliningrad, Russia
K. V. Vlasova
Candidate of physical and mathematical sciences, associate professor of the Baltic State Academy of the BGA RF fishing fleet, Kaliningrad, Russia
S. V. Petrov
Graduate student of Institute of physical and mathematical sciences and information technologies of the Immanuel Kant Baltic Federal University, Kaliningrad, Russia
R. V. Simonov
Graduate student of Institute of physical and mathematical sciences and information technologies of the Immanuel Kant Baltic Federal University, Kaliningrad, Russia

Abstract

The present paper considers the possibility of solving the problem of signal detection against the background of stationary and non-stationary interference in near-range location systems of ground targets. Distinctive features are the following. The description of signals and interference in the likelihood function is made in digital form using two integral parameters: energy and a normalized cross-correlation coefficient. When solving the problem of detection against the background of interference, an interference bank is used, and the positions of optimal highresolution signal processing are applied. The basis of the work is experimental data obtained using the Bussol centimeter range radar station, designed for radar of ground targets at a distance of ≈1 500. The paper analyzes the possibilities of describing signals and interference in vector form using integral parameters: energy and correlation coefficient – at separate selected observation intervals. It is proposed to divide interference into stationary parameters, which preserve their parameters (energy and correlation coefficient) from implementation to implementation, and non-stationary parameters, which change their parameters in different implementations. Presented is a procedure for maximizing the likelihood function (minimizing the loss function) with the help of a priori known interference bank. Using a model experiment, the efficiency of suppression of both stationary and non-stationary interference is shown. Efficiency of signal detection against background of stationary and nonstationary interference is shown. The proposed description of signals and interference with the help of integral parameters and the use of an interference bank significantly extends the possibilities for solving statistical problems of radio engineering in location, direction finding systems, in spectroscopy, in medicine, in optical systems, in processing video information.

Keywords

Near radar, Ground target, Non-stationary interference, Integral parameters, Description, Signal, Interference bank, Maximum likelihood method, Likelihood equation, Likelihood functionality