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Device for monitoring the movement of a person

  • US 6,127,931 A
  • Filed: 08/16/1999
  • Issued: 10/03/2000
  • Est. Priority Date: 08/16/1999
  • Status: Expired due to Fees
First Claim
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1. A device for monitoring the movement of a person, said device comprising:

  • a) a homing unit including;

    i) means for independently generating a homing signal; and

    ii) means for transmitting said homing signal at predetermined intervals;

    b) a base unit including;

    i) means for receiving said homing signal;

    ii) means for processing said homing signal to determine whether said homing unit is within a predetermined distance from said base unit and generating an alarm signal upon determining said homing unit is at a distance from said base unit greater than said predetermined distance, said processing means determining a time between receipt of the sequentially transmitted homing signals and strength of said signal to determine a distance between said base unit and said homing unit;

    iii) means for alerting a user that said homing unit has moved a distance greater than said predetermined distance from said base unit upon receipt of said alarm signal from said processing means;

    iv) means for adjusting said predetermined distance;

    v) means for adjusting a reference time period utilized by said processing means for determining said predetermined distance; and

    c) means in said homing unit for establishing the monitoring area by setting the strength of the homing signal.

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