METHOD OF DETECTING ELECTRONIC DEVICES ILLEGALLY INSTALLED ON SITE Russian patent published in 2010 - IPC H04K3/00 G01R29/08 

FIELD: physics, communications.

SUBSTANCE: invention relates to apparatus for radio monitoring electronic equipment and can be used to detect electronic devices, mainly small devices, illegally installed on a site (DIIS). Electromagnetic signals are received in a preset frequency range. Parametres of the received signals are measured: carrier frequency f₀ and amplitude U₀ of the signal at that frequency and recording the measurement results. Each signal is successively received at frequencies of the n-th harmonic f_n, where n=1, 2, 3…m. Amplitude of the received signal Un on the n-th harmonic is measured and recorded. Further, amplitude values of the electromagnetic signal at frequencies corresponding to the harmonic are compared. If U₀<U₁, the received signal is excluded from further analysis. Satisfaction of the condition U₀>U₁>U₂>…U_m indicates presence of an illegally installed electronic device.

EFFECT: increased reliability and cutting on time for detecting electronic devices illegally installed on a site without preliminary data on parametres of electromagnetic signals of radioelectronic apparatus, which may be illegally installed on a site.

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