Hellas: obstacle warning system for helicopters

The obstacle warning system for Helicopters HELLAS is presented which is available as off the shelf system. The system generates a 3 D Ladar image based on a 1,5 micrometers Erbium-Fiber Laser. The system is specially designed to detect wires with a high detection probability of >99,5 % within one second. The implications of this requirement on the design are discussed.