METHOD OF TRACKING AN AERIAL TARGET IN A RADAR STATION FROM A CLASS OF 'AIRCRAFT WITH TURBOJET ENGINE' UNDER ACTION OF DISTANCE AND SPEED WITHDRAWING INTERFERENCE

摘要

FIELD: radar; data processing.;SUBSTANCE: invention relates to secondary digital processing of radar signals and can be used in a radar station (RS) for generating, when an aerial target (AT) is accompanied from a class "aircraft with a turbojet engine", reliable identification of combined or separate effects of distance and speed withdrawing interference or their absence. Method consists in identification of combined or separate effect of distance and speed withdrawing interference or its absence with simultaneous formation of reliable unconditional estimates of range to AT and speed of approach of RS carrier to AT at integration of RS information and an indicator of the effect of withdrawing interference, taking into account the a priori data on the change of these versions and adaptation of the observation system to them based on the narrow-band Doppler filtration of the signal reflected from the target using a fast Fourier transformation procedure, generation of readings of Doppler frequencies caused by reflections of signal from airframe and blades of impeller of first stage of low pressure compressor of power plant AT, processing of generated Doppler frequency readings and output indications of the effect of withdrawing interference in multiturn filter of combined tracking of AT and first compressor component of signal spectrum, functioning in accordance with procedure of quasi-optimal combined filtration of phase coordinates and recognition of state of mark structure of linear stochastic dynamic system, operating on the basis of a priori data in the form of a mathematical model of the "AT – RS – indicator" system with a random step-like structure, including linear dynamics models of radial functionally related coordinates of mutual movement of the RS and AT carrier, their measurements in the radar station, changing the version of the effect of escaping noise, indicator of the effect of withdrawing noise, uncontrolled random disturbances and noise under initial conditions. At the output of the multichannel filter estimates of the version of the effect of withdrawing noise, unconditional mathematical expectation of functionally related coordinates of mutual movement of the AT and the RS carrier are formed with combined or separate effect of distance and speed withdrawing interference or in the absence of such action, and unconditional covariance matrix of their estimation errors.;EFFECT: high reliability of identifying joint or separate interference of range-capturing interference and estimating range to AT and rate of convergence of carrier RS with AT.;1 cl, 1 dwg