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Wireless tracking system and method with optical tag removal detection

  • US 7,443,297 B1
  • Filed: 12/29/2007
  • Issued: 10/28/2008
  • Est. Priority Date: 10/19/2007
  • Status: Active Grant
First Claim
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1. A method for determining if a tracking tag has been removed from an asset, the method comprising:

  • detecting motion of a tag with a motion sensor provided on the tag, the tag attached to an asset;

    transmitting an activation signal to a tag removal sensor disposed on the tag, the activation signal activating the tag removal sensor from a low power consumption state;

    determining if the tag is currently attached to the asset;

    transmitting an unattached signal to a transceiver of the tracking tag to indicate that the tracking tag is currently unattached to the asset;

    broadcasting the unattached signal to a plurality of network sensors positioned within an indoor facility; and

    transmitting the unattached signal from at least one of the plurality of network sensors to a positioning engine to generate a warning.

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