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Position location system and method

  • US 5,883,598 A
  • Filed: 12/15/1995
  • Issued: 03/16/1999
  • Est. Priority Date: 12/15/1995
  • Status: Expired due to Fees
First Claim
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1. A position location system comprising:

  • a portable unit comprising a transmitter that transmits a locating signal which is composed of at least two tone components;

    a plurality of base stations that receive the locating signal, each base station comprising;

    one or more antennas that receive the locating signal, with at least one base station having at least two antennas;

    at least one receiver coupled to each of the antennas, the receiver generating values indicative of amplitude and phase of at least two tone components of the locating signal, as received at the corresponding antenna and measured at a defined time; and

    a processor that receives the values indicative of amplitude and phase from the plurality of receivers at the base stations, and combines the values indicative of amplitude and phase to determine the position of the portable unit.

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