METHOD FOR DETERMINATION OF DIRECTION TO RADIATION SOURCE WITH PHASE DIRECTION FINDER ON QUADCOPTER Russian patent published in 2023 - IPC G01S3/46 G01S5/04 G01S13/44 

FIELD: radio navigation.

SUBSTANCE: invention relates to the field of radio navigation; it can be used for unequivocal determination of an angular position in an azimuth plane of a ground radio beacon with a phase direction finder placed on a quadcopter. The claimed method is based on reception of a radiation source signal in one plane with two antennas installed on a carrier symmetrically to its building axis at a base distance, multiplication of received signals in a multiplier, and determination of a bearing to a radiation source by a level of a signal at a multiplier output. In addition, antennas are made non-directional, and the carrier is a quadcopter. In the presence of a signal at the multiplier output, the quadcopter is switched to a hanging mode, rotated around its axis, and a level of a signal at the multiplier output is measured. A zero value of the signal at the multiplier output, closest to the maximum, and a corresponding angular position of the quadcopter relatively to a normal to the base are determined, and the quadcopter is additionally rotated to it. The quadcopter is straightly moved in a direction finding plane, in a direction perpendicular to the base, and a value of the signal at the multiplier output is measured. If the signal decreases, then it is considered that the radiation source is in a movement direction, and the angle corresponding to the closest maximum value at the multiplier output is its true bearing. Otherwise, a decision is made that the radiation source is located in an opposite direction, and the angle corresponding to the closest maximum value at the multiplier output, +180°, is its true bearing.

EFFECT: provision of a possibility of determination of a direction to a radiation source with a phase direction finder on a quadcopter due to reduction in weight and dimensions of the direction finder, as well as expansion of a simultaneous observation sector up to 360°.

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