Personnel monitoring tag

  • US 5,745,037 A
  • Filed: 06/13/1996
  • Issued: 04/28/1998
  • Est. Priority Date: 06/13/1996
  • Status: Expired due to Term
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First Claim
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1. A method for monitoring individual persons of a plurality of persons, comprising the steps of:

  • transmitting information signals at random times from individual ones of a plurality of tags to at least one master transceiver, the individual ones of the plurality of tags each to be worn by a respective person, the information signals transmitted from the individual tags corresponding to whether the tag is in use, and wherein a probability that an individual one of the plurality of tags will transmit an information signal during a period of time that none of the other ones of the plurality of tags are transmitting information signals is represented by Ptx, where;

    ##EQU5## and where ton represents a duration of an information signal transmission;

    toff represents an average time interval between chronological information signal transmissions of interest;

    n represents the number of the other ones of the plurality of tags, and m represents a number of transmissions attempted during the time period;

    in response to the at least one master transceiver receiving an information signal to an associated confirmation device; and

    within the confirmation device, in response to receiving an information signal from the master transceiver, confirming that the person corresponding to the tag generating the information signal is accounted for.

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