METHOD OF DETECTING SINGLE-LOOP PARAMETRIC SCATTERERS WITH NONLINEAR GENERATION OF SYNCHRONISING SIGNAL Russian patent published in 2013 - IPC G01S13/74 

FIELD: radio engineering, communication.

SUBSTANCE: in order to apply coherent integration when detecting single-loop parametric scatterers (SPS), a synchronising signal is emitted at the same time as pumping radio pulses at frequency f. When detecting SPS with natural frequency of parametric excitation of 0.5f, a synchronising radio pulse is emitted at frequency 0.25f. The response signal from the parametric scatterer is synchronised from a signal with frequency 0.5f, which is a spectral component at second harmonic frequency during nonlinear conversion of the synchronising radio pulse on a nonlinear element which is a component of the parametric scatterer, and high-frequency filling phases of synchronising radio pulses for alternative binary symbols of a selected binary encoding law differ by π/2. The synchronising radio pulse is emitted simultaneously or a little earlier than the pumping radio pulse. Under the effect of said radio pulses, nonlinear interference can arise on interfering nonlinear scatterers at a frequency of the received signal 0.5f. To compensate for said interference, an additional radio pulse with duration equal to the time of the synchronising radio pulse and phase differing by π/2 is emitted before or after the synchronising radio pulse at the same frequency.

EFFECT: improved method.

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