METHOD FOR PASSIVE DETECTION OF AERIAL OBJECTS Russian patent published in 2015 - IPC G01S11/02 

FIELD: radio engineering, communication.

SUBSTANCE: results are achieved using wide beam antennae, as well as by compensating the forward signal of a transmitter and signals reflected from industrial objects, by averaging an estimate of Doppler frequency shift on estimates obtained at each of four receiving stations.

EFFECT: wider coverage area of the system for detecting aerial objects, high accuracy of estimating Doppler frequency shift of signals reflected from an aerial object in the presence of interfering signals re-reflected from industrial objects.

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