Radar signal receiving and processing device for countermeasures analyzer

摘要

The amplitude-frequency spectrum of an input signal can be reproduced as an amplitude-time waveform by mixing (2) the input E with a linear frequency ramp (4) and supplying the difference frequency to a linear dispersive filter 12 whose time-delay/frequency characteristic has a slope matching that of the ramp. To avoid discontinuities at the end of each ramp, the system includes two mixers (2, 3) enabling two multiplications of the input signal to be made in parallel by two linearly frequency modulated frequency ramps, shifted with respect to each other by a duration T. This device also includes, for the processing, means of recognizing the carrier frequency of radar transmissions thus detected, by taking account of the special nature of the output signals of the spectrum analyzer. IMAGE