An impact motion tracking system for tracking an object in a three-dimensional space, whereby a motion tracking sensor comprises a housing, a magnetic measurement module and an inertial measurement module； a transmitter module generates magnetic fields； said magnetic measurement module measures magnetic fields generated by said transmitter module, said magnetic measurement modules has a fixed positional relationship with at least one object portion of said object； said inertial measurement module measures at least one of a linear acceleration and an angular acceleration, said inertial measurement module has a fixed positional relationship with said at least one object portion； an electronic processor receives measured signals from said motion tracking sensor； said electronic processor derives an impact motion information for said object portion based on received measured signals from said inertial measurement module； said electronic processor derives a magnetic motion information for said object portion based on received measured signals from said magnetic measurement module； said electronic processor periodically calibrates impact motion information with magnetic motion information； and said object is at least one of a crash test dummy and a vehicle to be crashed.
