DETECTOR FOR DETECTING OBJECTS WITH NONLINEAR ELEMENTS Russian patent published in 2014 - IPC H01Q1/00 G01S13/56 

FIELD: physics, navigation.

SUBSTANCE: invention relates to search devices and is designed for detecting objects based on reception of signals resulting from secondary re-radiation with change in the spectrum of the probing signal. The detector has first and second generators which emit probing signals at close frequencies f₁ and f₂, and a receiver with a receiving antenna which receives signals in a frequency range close to the frequencies f₁ and f₂. To eliminate nonlinear combination-type interference and interference associated with blocking effects, probing signal antennae further include ferrite valves. Between the receiver and the second probing signal generator, there is a compensator for the second probing signal at the input of the receiver, consisting of two directional couplers, a variable attenuator and a variable phase-changer. A decision on detection of an object with nonlinear elements is made if a combination-type component at frequency 2f₁-f₂ or 2f₂-f₁ is detected at the input of the receiver. In another mode, the decision is made if the receiver detects a signal at frequency f₁, which is modulated with frequency F, wherein the probing signal at frequency f₂ is modulated with frequency F.

EFFECT: enabling detection of objects with nonlinear elements which may in turn include narrow-band nonlinear objects.

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