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Method and apparatus for locating a transmitter of a diffuse infrared signal within an enclosed area

  • US 5,838,472 A
  • Filed: 07/03/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 07/03/1996
  • Status: Expired due to Term
First Claim
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1. A method of locating a portable remote station transceiving a diffuse infrared communicated signal within an enclosed area containing a plurality of stationary infrared transceivers interconnected with a central controller, such method comprising the steps of:

  • detecting a particular transmission of the diffuse infrared communicated signal from the portable remote station within the enclosed area by the plurality of stationary transceivers;

    measuring a signal strength of the particular signal from the portable remote station by each stationary transceiver of the plurality of stationary transceivers;

    identifying a first stationary transceiver measuring a highest relative signal strength and a second stationary transceiver measuring a second highest relative signal strength of the particular signal from the portable remote station;

    determining a relative distance of the portable remote station from the first and from the second stationary transceivers on either side of a center line between the first and second stationary transceivers based upon the measured signal strength; and

    locating the portable remote station based upon differences in the signal strength measured at each stationary transceivers.

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