This is an input device for interacting with virtual or augmented reality environments. It tracks its own position and orientation by combining data from an internal motion sensor (IMU) with signals received from remote ultrasonic or optical emitters. A sophisticated mathematical technique, such as a Kalman filter, continuously merges these two data streams to precisely locate the device in the virtual world.
Why it matters: Filed before the current generation of AR/VR hardware, which now has the embedded processing power and refined sensor technology to make this real-time, multi-sensor fusion approach highly accurate and cost-effective.
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