Method of recognition of an airborne target from its radar echo

摘要

This method comprises steps consisting in: (a) producing a Doppler radar transmission towards the target; (b) determining the comb of lines forming the Doppler spectrum of the signal received in return; (c) searching, at the centre of this comb, for a principal line (1) corresponding to the characteristic speed (VR) of movement of the aircraft; (d) determining the offset (DVR) between this principal line and the secondary line of the first order (2) of the comb; and (e) on the basis of this offset value and of the relative configuration of the lines of the comb, classifying the target into a predetermined target category. …??At step (e), it is possible, especially, to determine at least one intrinsic parameter of the spectrum (number of secondary lines, relative intensity of the secondary lines with respect to the principal line, absolute intensity weighted by the distance from the target of these secondary lines, radar equivalent cross section of the target), and to carry out, on the basis of these intrinsic parameters, prior determination of a target type from among several predetermined types. …??It is also possible to compare the comb of lines to a plurality of previously-established reference combs stored in a library of combs corresponding to known targets, and to select that one of these reference combs which exhibits the strongest degree of intercorrelation with the comb of lines of the received signal. …IMAGE…