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4.3. Technology for Motion Tracking and Capture 75
well over short periods of time and can work at high frequencies (that is, it
can report position often and so can cope well in fast changing environments).
Inertial tracking is best used in conjunction with one of the other methods,
because of the problem of initialization and the increases in error over time
without recalibration. Other problems with this method are electrical noise
at low frequencies, which can give the illusion of mov ement where there is
none, and a m isalignment of the gravity correction vector. Inertial tracking
has the potential to work over very large volumes, inside ...