TWO-DIMENSIONAL DIRECTION FINDING METHOD Russian patent published in 2020 - IPC G01S3/06 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering and can be used for two-dimensional direction finding of ground and air objects on their radio emissions. Method of two-dimensional direction-finding includes reception of signals of the radiator using vertical dipoles of the antenna array, which is parallel to the earth's surface, measurement of complex amplitudes of the received signals and estimation based on measurement results of the azimuth of the radiator. At that, signals are additionally received with the help of horizontal vibrators, these signals are summed up and complex amplitude of the total signal is measured, results of all measurements are converted in direction of obtained azimuth taking into account amplitude and phase diagrams of directivity of antennae into angular spectrum, by position of maximum of which determining elevation angle of emitter, wherein the horizontal vibrators are located in the plane of the grid, the phase centers are aligned with its center, and the axes are uniformly turned relative to each other. Position of maximum angular spectrum by elevation angle is preliminarily estimated as arctangent of amplitude ratio of total signal normalized to sum of values of directional patterns of horizontal vibrators in direction of zenith and estimated azimuth, to average amplitude of signals of vertical vibrators. Angular spectrum is determined at the point of preliminary evaluation and at points distant from it by the differentiation constant, and the position of the maximum is corrected by the interpolation formula.

EFFECT: high accuracy of determining the elevation angle of emitter in 2–6 times.

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