| 摘要 |
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 fn, where n=1, 2, 3Çm. 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 U0U1>U2>ÇUm 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. ^ 5 dwg |
