RADAR OBSERVATION OF NAVIGATION OBJECTS IN COMPLEX ATMOSPHERIC CONDITIONS USING POLARISATION SELECTION OF ECHO - SIGNALS

Abstract

The paper theoretically substantiates and experimentally confirms the methodology of using polarization selection of navigation objects located on the ship's trajectory in complex conditions of atmospheric environment by ship radar polarization complex. It is shown that the use of real Stokes energy parameters allows to recognize the echo-signal of a navigation object against the background of echo-signals of atmospheric formation with the use of energy scattering matrix and echo-signal processing device of a complex object (navigation object and atmospheric formation) at the output of the receiver of the ship radar polarization complex (SRPC). The theoretical basis for recognition is a radiophysical model of the scattering energy matrix with elements represented by Stokes parameters and measured SRPC. The selected irradiating echo-signals of the navigation object and atmospheric formation determined the type of energy scattering matrix of a complex object and ensured the functioning of SRPC in a complex atmospheric environment when solving the problem of polarization selection.

The schemes for processing the echo-signal of a complex object have been developed, which made it possible to separate the echo-signal of a navigation object from the echo-signal of a complex object by measuring the elements of the energy matrix of scattering.

The possibility of using the energy matrix of partially polarized wave in polarization selection of navigation objects located in complex conditions of atmospheric environment was substantiated. The energy matrix of scattering allows to obtain in SRPC the information about polarization of echo-signal of partially polarized wave of navigation object and atmospheric formation by measuring the intensities of their echo-signals, which solve the problem of polarization selection of navigation objects. Moreover, the intensity of rainfall is measured by the SRPC according to the first Stokes parameter. The results of experimental verification of the efficiency of using the energy matrix in polarization selection of navigation objects located in the zone of atmospheric formation dangerous for navigation are presented.