TARGET CLASS RECOGNITION METHOD AND DEVICE FOR REALISING SAID METHOD Russian patent published in 2013 - IPC G01S13/53 

FIELD: radio engineering, communication.

SUBSTANCE: method of recognising the class of a target involves radiating electromagnetic energy towards the target; receiving signals reflected from the target and recognising the target; performing narrow-band filtering of the Doppler frequency component of the spectrum of the reflected signal; determining the target approach velocity band ΔV, which is included in the band-pass of the a Doppler frequency filter ΔF_D using the expression ΔV=ΔF_Dλ/2, where λ is the radiation wavelength; determining the Doppler frequency band ΔF_DTS occupied by the signal reflected from the target; determining target velocity band ΔF_T occupied by the signal reflected from the target using the expression ΔV_TS=ΔF_DTSλ/2; determining the ratio β=ΔV_TS/ΔV, wherein if β≤0.01, the target is considered a point target on velocity, and if β≥0.01, the target is considered an extended target on velocity, characterised by that the extended target is selected according to the expression: β=ΔV/ΔV_TS, at a given distance from the target, wherein if β≥β₁, the target is considered small, if β≥β₂ the target is considered medium and if β≥β₃ the target is considered large, wherein said inequalities uniquely determine the class of the target at the following values $${\beta }_1=\frac{\Delta V_T}{\Delta V}=\mathrm{0,05,}$$ $${\beta }_2=\frac{\Delta V_T}{\Delta V}=\mathrm{0,25,}$$ $${\beta }_3=\frac{\Delta V_T}{\Delta V}=\mathrm{0,40.}$$ The device for recognising the class of a target further includes a channel for selecting extended targets, a "small target" indicator, a "medium target" indicator and a "large target" indicator.

EFFECT: high information value owing to recognition of the class of a target - small, medium and large.

2 cl, 1 dwg