Position-tracking device for position-tracking system

Details Position-tracking device for position-tracking system Position-tracking device for position-tracking system

2007-07-17

2007-07-17

Lieu, Julie Bichngoc (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C701S213000, C701S216000, C701S220000, C703S002000, C342S357490, C342S357490, C342S357490

Reexamination Certificate

active

11054905

ABSTRACT:
A position-tracking system for tracking the position of an object is disclosed. According to various embodiments, the tracking system includes a tracking device that is connected to or otherwise affixed to the object to be tracked. The tracking device may include, among other things, an inertial sensor assembly, radio transceivers and a processor. The position tracking system may also include a host processing system that is in communication with the tracking device. The position tracking system may provide variable-resolution position information based on the environment in which the object is moving. In a “wide resolution” area, the system may compute a general position for the object based on a wireless telephone network Cell-ID/map correlation architecture. In a high-resolution area, greater position resolution may be realized from the combination of a wireless aiding system and inputs from the inertial sensors. In the high-resolution mode, the system may exploit distinct patterns of motion that can be identified as motion “signatures” that are characteristic of certain types of motion. Kinematic (or object movement) models may be constructed based on these motion signatures and the position tracking system may estimate the state of the object based on the kinematic model for the current mode of the object. Adaptive and cascaded Kalman filtering may be employed in the analysis to more accurately estimate the position and velocity of the object based on the motion pattern identified.

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