FIELD: radio engineering, communication.
SUBSTANCE: result is achieved based on the use of a cross-correlation function of reflected and reference signals, wherein the number of maxima of the cross-correlation function is used to establish the range in which the true value of the Doppler frequency of the reflected signal is located, followed by the determination of the true value of the radial velocity of the target. The correlation analysis of reflected signals is performed by first converting the said signals to a digital form, followed by merging into a single synthesised digital signal whose duration is equal to the repetition period of the radar pulses. After calculating the cross-correlation function of the synthesised signal, its envelope is passed through a low-pass filter and the number of its global maxima N is counted. This enables to determine the frequency range in which the true Doppler frequency of the reflected signal is located. The advantage of the present method lies in enabling the unambiguous measurement of the radial velocity of an aerial target in a coherent-pulse radar station at Doppler frequencies which exceed the repetition frequency of probing ultrahigh-frequency pulses.
EFFECT: unambiguous measurement of the radial velocity of an aerial target in a coherent-pulse radar station.
12 dwg
