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ULTRASOUND ZONE LOCATION SYSTEM WITH HIGH CAPACITY

  • US 20110018687A1
  • Filed: 11/12/2008
  • Published: 01/27/2011
  • Est. Priority Date: 11/13/2007
  • Status: Active Grant
First Claim
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1. A zone location system arranged to determine in which zone of a predetermined set of zones a portable tag is present, the system comprising:

  • a set of ultrasound transmitters located in respective zones of the predetermined set of zones, wherein the ultrasound transmitters are arranged to generate an ultrasound signal;

    a portable tag with an associated identification code, the portable tag comprising;

    an ultrasound receiver arranged to receive the ultrasound signal,a signal processing means arranged tomeasure a strength of the received ultrasound signal and to generate a first data value accordingly, andmeasure a parameter related to a movement of the portable tag, and generate a second data value accordingly;

    a Radio Frequency transmitter (RFT) arranged to transmit a Radio Frequency signal with data representing the identification code, and the first and second data values;

    a Radio Frequency station arranged to receive the Radio Frequency signal from the portable tag; and

    a processor operationally connected to the Radio Frequency station, the processor being arranged to;

    identify the portable tag based on the identification code,determine in which zone the portable tag is present, based on detecting which of the set of ultrasound stations are capable of establishing a communication with the portable tag on the ultrasound channel, anddetermine a position within said zone, based on the first and second data values.

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