METHOD OF DETECTING DOUBLE-LOOP PARAMETRIC SCATTERERS Russian patent published in 2012 - IPC G01S13/74 

FIELD: physics.

SUBSTANCE: when detecting double-loop parametric scatterers with parametric excitation frequencies f₁ and f₂ in order to facilitate application of coherent integration in a receiver, a probing signal is emitted, said signal consisting of a sequence of radio pulses of a pumping signal at frequency f=f₂+f₁ and a binary sequence of radio pulses of a synchronisation signal at frequency f₂, which is encoded according to a defined law, and a binary sequence of radio pulses at frequency f₁, which is encoded according to the same law, is used, wherein opposite symbols of the binary sequence correspond to pulses having opposite current phases. Under the effect of these radio-frequency pulses, combinatorial nonlinear noise at frequency of the received signal f₁ may appear on the noise nonlinear scatterers. In order to compensate for this noise, a compensating radio pulse is emitted after the synchronising radio pulse at the same frequency and with duration equal to the overlap time of the synchronising radio pulse and the pumping radio pulse.

EFFECT: compensation for nonlinear combinatorial noise.

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