Magnetic Field Tracker (MFTs) straddles the line between active and passive sensors. The MFTs produce a known AC magnetic filed and contain a reference transducer. Extra-system objects that interact with magnetic field are referred to as unknown transducers. Analysis magnetic field (shared by both transducers) allows the system to determine the location of the object in the x, y and z plane but also the unknown's roll, pitch and yaw relative to the known transducer. MFTs employ multiple known transducers, and continually cycle through different emission signals. This system also detects exogenous magnetic fields, and can be used completely passively.

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