Laser navigation:

this technology is the state-of-the-art option in free-navigation and the main alternative to magnetic navigation. A rotating laser scanner atop the vehicle determines position by precisely measuring angles and distances relative to reflectors placed overhead on walls and pillars. Laser technology allows accurate measurement over great distances. As is the case with terrestrial navigation, at least three reflectors are needed to triangulate exact position.
This technology is used by DS AUTOMOTION GmbH. www.ds-automotion.com

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