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Enhanced position calculation

  • US 5,717,406 A
  • Filed: 06/07/1995
  • Issued: 02/10/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method for determining a location from which an unknown position radio signal is transmitted, comprising the steps of:

  • transmitting from first and second known locations respective first and second radio signals;

    receiving said first radio signal at plural receivers located at different known locations;

    receiving said second radio signal at plural receivers located at different known locations;

    determining a reference time of reception when each radio signal transmitted from said first and second known locations is received by the plural receivers;

    communicating to a central processing device (CPD) the first and second radio signals received by plural receivers and the respective times of reception when the first and second signals were received by the plural receivers;

    training a network in the CPD using the received first and second radio signals and using the known locations from which the received first and second radio signals were transmitted in relation to the respective reference times of reception at the plural receivers of the received first and second radio signals;

    receiving at plural receivers an unknown position radio signal from an unknown location;

    communicating to the CPD the radio signals received by the plural receivers and the respective reference times of reception of the unknown position radio signal at the plural receivers;

    using the communicated unknown position radio signals at the plural receivers in relation to the respective reference times of reception of the unknown position radio signals as inputs to the trained network in the CPD; and

    outputting from the CPD an estimate of the actual location from which the unknown position radio signal was transmitted.

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