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Each Base Station contains an IR beacon called [[Sync Blinker]] and 2 laser emitters that spin rapidly. 60 times per second, the Sync Blinker would emit a synchronization pulse and 1 of the 2 spinning lasers would sweep a beam across the room. The receptors, HMDs and controllers, are covered with photosensors that recognizes the synchronization pulse and the laser beams. When it detects a synchronization pulse, the receptor starts to count til one of its photosensors is hit by the laser beam. Lighthouse calculates ''When'' the photosensor is hit by the laser and ''Where'' that photosensor is located to find the exact position of the receptor in relation to the Base Station. When there are 2 Base Stations, the position and the orientation of the receptors in the 3D space of the room is established.<ref name="tested_alan_yates">https://www.youtube.com/watch?v=xrsUMEbLtOs</ref>
Base Stations are vulnerable to [[occlusion]]. They require [[line of sight]] to the tracked objects. Base Stations are designed to be scalable. 2 Base Stations are placed in opposite sides of the room to minimize this problem. More Base Station can be placed to increase the tracking range.
==Tracking Volume==
