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→How Does It Work?
==How Does It Work?==
{{see also|Sensor fusion}}
[[Oculus Rift]] uses the [[IMU]]s as the primary positional tracking system. It responds extremely quickly and updates at several hundred Hz (1000Hz sampling, 500Hz reporting). However, IMUs drift due to double-integration of error. The drift is on the order of meters per second. So Constellation do is squelch that error 60 times per second (both have a 60Hz global position update rate) using their optical sensors to provide an absolute position reference.