METHOD OF PREVENTING COLLISION OF HELICOPTERS WITH HIGH-VOLTAGE POWER TRANSMISSION LINES Russian patent published in 2011 - IPC G01S13/93 

FIELD: physics, radio.

SUBSTANCE: invention relates to radar engineering and can be used to prevent collision of helicopters with high-voltage power transmission lines. The invention involves receiving electromagnetic oscillations reflected from a power transmission line pole in the radio wave range using a first and a second direction finder mounted on a helicopter and lying on the front at a distance B from each other. Each direction finder scans the space in the direction of flight of the helicopter, where the first direction finder scans anticlockwise and the second - clockwise. Locating angles of each of the two power transmission line poles is determined by each direction finder, where α₁, α₂ are locating angles of the first and second power transmission line poles determined by the first direction finder, and β₁, β₂ are locating angles of the first and second power transmission line poles relative the axis of the helicopter, determined by the second direction finder. Distance to cables of the power transmission line in the direction of the axis of the helicopter is determined using the expression , where B is distance between direction finders, µ is the angle between the power transmission line and the axis of the helicopter. The distance to the cables of the power transmission line on the direction of the axis of the helicopter is determined taking into account wind velocity using the expression: , where α_dr is the angle of drift (the angle between the course surface and the path plane). The decision to correct the direction of flight of the helicopter is made based on the range value.

EFFECT: high reliability of preventing collision of a helicopter with power transmission lines.

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