METHOD OF PREVENTING COLLISION OF HELICOPTERS WITH HIGH-VOLTAGE POWER TRANSMISSION LINES Russian patent published in 2011 - IPC G01S13/93 G08G5/04 

FIELD: physics, radio.

SUBSTANCE: invention can be used to prevent collision of helicopters with high-voltage power transmission lines (PTL). The method involves receiving electromagnetic oscillations reflected from power transmission line poles in the radio wave range using a radar direction finder mounted on the helicopter. The direction finder scans space in the direction of flight of the helicopter. Locating angles α₁, α₂ and range values D₁, D₂ to each of the two power transmission line poles are determined. The range values are then compared and if D₁<D₂, the range D_PTL to cables of the PTL in the direction of the axis of the helicopter and the angle β of the position of the cables of the PTL relative the direction of the axis of the helicopter, respectively, are determined using the expression:

if D₁>D₂ the range D_PTL in the direction of the axis of the helicopter and the angle β of the position of the cables of the PTL relative the direction of the axis of the helicopter, respectively, are determined using the expression:

if D₁=D₂, the range D_PTL in the direction of the axis of helicopter is determined using the expression: D_PTL=D₂·cosα₂. The decision to correct the direction of flight of the helicopter is made based on the range value.

EFFECT: high accuracy of determining distance to cables.

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