FIELD: area of secondary digital processing of radar signals.
SUBSTANCE: method consists in parallel tracking on the basis of narrow-band Doppler filtration and procedure of fast Fourier transformation of Doppler frequencies counts, caused by reflections of signal from fuselage of helicopter and rotary blades of rotor of helicopter. Then, the reading Ff of the Doppler frequency of the spectral component with the maximum amplitude Af exceeding the first threshold U1 and corresponding to the signal reflections from the helicopter fuselage is determined. Obtained discrete-successive readings of Doppler frequencies are filtered in the first tracking filter. Determining readings Fi, where i = 1, …, I; I is total number of amplitudes of spectral components exceeding second threshold U2 corresponding to reflections of signal from rotor blades, except for spectral component with maximum amplitude Af and corresponding reflections of signal from helicopter fuselage. Value of the second threshold U2 is n times less than the value of the first threshold U1. Counts Fe of Doppler frequency are calculated, which corresponds to energy center of signal reflections from helicopter main rotor blades, and are filtered in the second filter. In the presence of counts of Doppler frequencies of spectral components exceeding the first threshold U1 and corresponding to reflections of the signal from the fuselage of the helicopter, estimates of parameters of the helicopter motion are formed when it is tracked by reflections of the signal from its fuselage. In the presence of counts of Doppler frequencies of spectral components exceeding the second threshold U2 and not exceeding the first threshold U1, estimates of parameters of movement of the helicopter when it is tracked by reflections of the signal from rotor blades are formed.
EFFECT: providing continuous accompaniment of a helicopter in a pulse-Doppler radar station.
1 cl, 2 dwg
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