Phase coherent ultrasonic tracking
Phase coherent ultrasonic tracking is a type of ultrasonic tracking that measures the phase of the signal and compares it with a reference signal to determine the translation of a moving point.
Phase coherent methods work like this: The difference between two successive measurements of phases allows to compute the distance change since the last measurement.[1] Basically, the translational movement of an ultrasonic emitter results in the receiver sensing a different phase. The receiver compares the sensed signal with a reference signal to determine the phase.[1] It is a relative system.
Phase coherent methods rely on slow movement. In its raw form it is not resilient to doppler effect.
It is at risk of multi-path interference, meaning sound can bounce off of walls and interfere.[2]
References[edit]
- ↑ 1.0 1.1 Mazuryk, Tomasz; Gervautz, Michael (1999-12-30). "History, Applications, Technology and Future". https://www.researchgate.net/publication/2617390_Virtual_Reality_-_History_Applications_Technology_and_Future.
- ↑ "COMP 4010 Lecture5 VR Audio and Tracking". 2016-08-23. https://www.slideshare.net/slideshow/comp-4010-lecture5-vr-audio-and-tracking/65257828.