System for tracking object locations using self-tracking tags

Details System for tracking object locations using self-tracking tags System for tracking object locations using self-tracking tags

2006-10-10

2006-10-10

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C342S357490, C342S450000, C340S539130

Reexamination Certificate

active

07119687

ABSTRACT:
An object tracking system includes a plurality of tags. Each tag includes a mechanism for transmitting a triangulation signal and a position signal that is indicative of a change of position of the respective tag in a time period since a respective reset event. A plurality of triangulation stations receive the triangulation signals from the tags. At least one antenna receives the position signals from the tags. A computer is coupled to the triangulation stations and to the antenna. The computer is programmed to switch between (a) a first tag location algorithm to determine a current location of one of the tags using a differential time of arrival procedure based on the triangulation signal, and (b) a second tag location algorithm to determine a current location of the tag based on the position signal transmitted by the tag and a previous known location of the tag.

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