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Bi-Modal Remote Identification System

  • US 20080180218A1
  • Filed: 11/07/2007
  • Published: 07/31/2008
  • Est. Priority Date: 11/07/2006
  • Status: Abandoned Application
First Claim
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1. A bi-modal identification system comprising:

  • a base unit comprising a radio frequency signal receiver and an ultrasound signal transmitter;

    a mobile unit comprising an ultrasound signal receiver and a radio frequency signal transmitter; and

    a central processor for processing and coordinating a data exchange between the base unit and the mobile unit, the exchange comprising a first radio frequency signal transmission, a first ultrasound signal transmission subsequent to receipt of the first radio frequency signal, and a second radio frequency signal transmission, wherein the base unit is capable of processing exchange information for calculating detection data for the mobile unit and location data of the mobile unit.

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