Radar target classification system for jet aircraft

摘要

The target classification system uses the doppler spectrum obtained from te radar echo signals, with suppression of the spectrum components resulting from clutter and the velocity of the radar target, before classification of the target by analysis of periodic, spectral lines within the doppler spectrum, e.g. via a neural network. The analogue radar echo signal is converted into a corresponding digital echo signal, with the time range divided into a number of time increments, each provided with a respective complex sample value, corresponding to an amplitude value. A given number of sample values are grouped in a main block, subjected to Fourier transformation for conversion into the frequency range, each spectrum subjected to removal of clutter and velocity vector components and amplitude normalisation, and the indication vector obtained for the block compared with the indication vectors of known targets.