METHOD OF TRACKING AERIAL TARGET FROM "TURBOJET AIRCRAFT" CLASS UNDER EFFECT OF VELOCITY DEFLECTING NOISE Russian patent published in 2016 - IPC G01S13/52 

FIELD: radar and radio navigation.

SUBSTANCE: invention relates to secondary digital signal processing in radar station and can be used for tracking and identifying the type of air target from the class of "aircraft turbojet engine" under the effect of velocity deflecting noise. Method consists in: parallel tracking based on Kalman filtration counts of Doppler frequency caused by reflections from the glider target signal and rotating structures of LP compressor of its power plant; calculating the difference between received values of Doppler frequencies; calculation module derivative of difference and comparing with threshold close to zero; segmentation of the whole range of differences on nonoverlapping subbands, each of which corresponds to only one type of target; calculation in several intermediate cycles of both Kalman filters probability of evaluation of difference frequencies in each of a priori formed subrange; determining the number of subband, for which the value of this probability is maximum and its comparison with preset threshold probability of recognising; decision on detection of target type with a probability of not lower than preset; in case of peripheral module of difference derivative and compressor components of Doppler frequency threshold, close to zero (with no effect of velocity deflecting noise), forming output information in the form of evaluation of target type and Doppler frequency based on dynamic model in Kalman filters and input signal, otherwise (if the difference module threshold effect of velocity deflecting noise) in the form of evaluation of target type recognised to effect of interference and Doppler frequency only based on dynamic model of signal spectrum component.

EFFECT: high reliability of output data.

1 cl, 3 dwg