FIELD: physics.
SUBSTANCE: disclosed is a method of determining the elevation coordinate of a low-flying target, involving reception of a composite signal reflected from the target and the underlying surface at outputs of four antennae; plotting discriminator curves of the coordinate metre in two orthogonal planes Sx and Sy and positioning the maximum of the main lobe of the resultant beam pattern of the antenna system of the coordinate metre in the direction of the point of projection of the target on the underlying surface, characterised by that the centres of the four antennae of the coordinate metre are paired symmetrically in the horizontal and vertical planes; an additional signal is generated at one the outputs of the coordinate metre, which is the difference of composite signals of pairs of the elements of the antenna system lying in the horizontal and vertical planes, which is used to plot an additional discriminator curve, and the elevation coordinate and (for known inclined range) altitude of the low-flying target are determined from the relationships using the obtained discriminator curves.
EFFECT: high accuracy of determining coordinates of a target.
8 dwg
