Operation principle of intro-pulse autodyne FM SRR

This paper shows the functional circuit of short-range radar (SRR) with pulse modulation and FM. Time diagrams of such SRR output signals are also presented. The modulation pulse parameters and gating parameters, their interposition in time are defined in the synchronization unit. At the same unit, the synchronization of pulse modulation processes and FM is provided. The radiation reflected from a target inside of each radio pulse causes the amplitude and frequency variations due to the autodyne effect as well as the bias voltage variations after time T later on the beginning of the radio pulse formation. The amplitude variations are usually extracted by means of the additional (external) detector, but the bias voltage variations in the oscillator supply circuit.