Enhanced time-difference localization system

  • US 6,119,013 A
  • Filed: 02/16/1999
  • Issued: 09/12/2000
  • Est. Priority Date: 05/17/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for locating a mobile radio communications transceiver in an operating environment served by a wireless communications system, comprising:

  • two sensor stations of known location that receive a radio signal from the mobile transceiver, each sensor station having an inter-site synchronization mechanism for common time standard maintenance, and each sensor station further having a corresponding signal characterization processing unit that determines, from the radio signal, time of signal arrival information;

    a source of collateral information related to a location of the mobile transceiver, wherein the collateral information comprises angle of arrival information determined from the radio signal;

    a processing unit that determines time difference of signal arrival information based on the time of signal arrival information determined by each said signal characterization processing unit; and

    a processing unit that determines a probable position of the mobile transceiver based on the time difference of signal arrival information and the collateral information.

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