METHOD FOR DETERMINING INTERMODULATION PARAMETERS OF RANDOM ANTENNA Russian patent published in 2011 - IPC G01R29/08 

FIELD: radio engineering.

SUBSTANCE: method for determining intermodulation parameters of random antenna, which involves action on random antenna emitting the signal with frequency ѓ_c, electromagnetic emission of additional transmitter with frequency ѓ_∂ is characterised by the fact that by means of measuring receiver there determined is unknown frequency ѓ_c of signal emitted with random antenna; minimum possible frequency value of additional transmitter is calculated: ѓ_∂.min = ѓ_c - ѓ_min; if ѓ_c>ѓ_∂; ѓ_∂.min = ѓ_c + ѓ_min; if ѓ_∂ >ѓ _c, and maximum possible frequency value of additional transmitter: ѓ_∂.max-(ѓ_max-mѓ_c)/n by means of noise generator connected to additional transmitter; external action on random antenna is performed in frequency band ѓ_∂.min÷ѓ_∂.max and by means of final device connected to measuring receiver; density levels of power "П"₀ and "П"_i (or intensities of electric field E₀ and E_i) are measured respectively at frequencies ѓ_c and ѓ_i of signals in location place of measuring receiver; relative χ_im levels of intermodulation components of emission of random antenna are calculated as per formulas

or

EFFECT: improving accuracy and reliability of results for determination of random antenna parameters that refer to all channels of confidential information leakage, which are potentially probable in it.

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