METHOD FOR AMOLITUDE-PHASE DIRECTION FINDING BY ROTATING ANTENNA SYSTEM Russian patent published in 2021 - IPC G01S5/04 G01S3/46 G01S13/44 G01S13/87 

FIELD: radio transmission systems.

SUBSTANCE: invention relates to the area of radio direction finding, particularly to determination of bearing of a radio frequency source (RF source) by a system with rotating antennae without strongly pronounced directivity by consecutively changing the position of radiation patterns of the antennas while rotating them in the direction finding plane. To improve the accuracy of direction finding in the proposed method of amplitude-phase direction finding by a rotating antenna system scanning is performed by the radiation pattern of the selected antenna in the direction of the radio frequency source, the maximum signal value at the maximum of the radiation pattern of the selected antenna is determined, equal borders of the ψ_i scanning sector are determined wherein the level of the received signal at both borders within the sector takes equal values and reduces by at least 3 dB from the maximum value, the resulting sector is divided in half, wherein the direction to the radio frequency source is the bearing formed between the direction taken as the starting point and the line dividing the resulting scanning sector in half. The scanning sector is symmetrically reduced to the width of the zone Θ of single-valued interferometric direction finding using an interferometer formed by the selected antenna and the next antenna in the direction of rotation. The rotation angle of the axis of the radiation pattern of the interferometer formed by the antennas is registered, wherein the bearing at said angle is zero within the single-value sector and the angle corresponds with the exact direction to the RF source.

EFFECT: improved accuracy of direction finding in a rotating antenna system.

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