METHOD OF DETERMINATION OF ACCIDENTAL ANTENNA PARAMETRES Russian patent published in 2009 - IPC G01R29/08 H01Q1/36 

FIELD: radio engineering.

SUBSTANCE: method involves action of electromagnetic emission of additional transmitter with frequency f_∂ on accidental antenna emitting signal with frequency f_c, analysis of frequencies of intermodulation products of accidental antenna emission; by means of measuring receiver unknown frequency f_c of signal emitted by accidental antenna is determined; calculation is performed for minimum possible value of additional transmitter frequency: and maximum possible value of additional transmitter frequency: by means of sweep-frequency generator connected to additional transmitter frequency of external action on accidental antenna is changed within limits f_∂.min. : f_∂.max and by means of terminal device connected to measuring receiver levels of power flow density Π₀ and Π_i or of electric field intensity E₀ and E_i are measured correspondingly at frequencies f_c and f_j of signals in measuring receiver location; relative levels of intermodulation products of accidental antenna emission are calculated according to formulae.

EFFECT: increase of accuracy and validity of results of determination of accidental antenna parametres pertaining to all channels of confidential information leakage which is possible in it.

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