FIELD: physics, navigation.
SUBSTANCE: invention relates to radar engineering. The change in velocity of a target on range is determined using the expression V1-V3=(4Do/t2)×[(1-t1/t3)], where: t1 is the time interval during which the target flies over a distance S1 from (Do/Vo)(Vi+NVo)-δ×(D/Vo)(Vi+NVo) to (Do/Vo)(Vi+NVo)+δ×(Do/Vo)(Vi+NVo), δ is a coefficient which determines the length of known distances S1=S3, Vo and Do respectively denote the lowest possible target velocity and base distance selected based on the condition Do/Vo=fn/Fmfd, fn is the average frequency of chirp signal emitted by the radar station, fd and Fm denote deviation of frequency and modulation frequency of the chirp signal, N is a positive number, Vi is target velocity, C is the speed of light, t2 is a time interval during which the target flies over the distance S2 from (Do/Vo)(Vi+NVo)-δ×(n/Vo)(Vi+NVo) to (Do/Vo)[Vi+(N+4)Vo]+δ×(Do/Vo)[Vi+(N+4)Vo], t3 is the time interval during which the target flies over the distance S3 from (Do/Vo)[Vi+(N+4)Vo]-δ×(D/Vo)[Vi+(N+4)Vo] to (Do/Vo)[Vi+(N+4)Vo]+δ×(Do/Vo)[Vi+(N+4)Vo]. The apparatus for measuring change in target velocity on range includes: a transmitting-receiving antenna, a chirp signal transmitter, a mixer, a differential frequency filter, a narrow-band signal detector, a shift register, three AND elements, a delay element, three pulse counters, a count pulse generator, two multiplier circuits, two dividing circuits, a subtraction circuit and a constant digital number bus.
EFFECT: faster measurement of change in target velocity on range.
3 cl, 1 dwg
