RADIO-ELECTRONIC EQUIPMENT DETECTION METHOD Russian patent published in 2008 - IPC H04K3/00 

FIELD: radio engineering.

SUBSTANCE: radio-electronic equipment detection method implemented in radio monitoring facilities refers to radio engineering, and can be used for electronic environment variations control, signal extraction of radio-electronic equipment starting or stopping radiation, and frequency measurements, signal direction of arrival and distance of radio-electronic equipment arranged in near-field region. Method implies that signals are received with planar antenna and multiplied. That is followed by multiplication and low-frequency filtration of output voltage of every antenna component with output voltage of all other antenna components. Multiplication and filtration results are represented in the form of correlation signal matrix. These signals are delay for delay time τ₃. Signals of the current and delayed signal matrixes are elementwise subtracted. Subtraction results are represented as differential correlation signal matrix which is nonvacuous matrix in case number of emitting radio-electronic equipment is changed over a period of time equal τ₃ and represents correlation matrix of arising or lost signal. Based on differential correlation signal matrix type the values of operating frequency and signal direction of arrival of radio-electronic equipment in far-field region are evaluated. Polarity of differential correlation signal matrix is measured to estimate signal ownership to radio-electronic equipment stopping or starting radiation. It is followed with additional comparison of signal levels of differential correlation matrix elements corresponding to signal cross-correlation function in adjacent pairs of antenna components, and in case they are not equal at least for one linear array of multiple antenna system, detected radio-electronic equipment is related to near-field region. Differential correlation signal matrix type is used to evaluate operating frequency, signal direction of arrival of radio-electronic equipment, radiation over a period of time τ₃ and distance of this radio-electronic equipment.

EFFECT: provided detection of radio-electronic equipment signals and evaluation of their frequency, spatial parameters and distance of radio-electronic equipment in near-field region.

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