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System and methods for IP and VoIP device location determination

  • US 20070030841A1
  • Filed: 05/11/2006
  • Published: 02/08/2007
  • Est. Priority Date: 05/12/2005
  • Status: Active Grant
First Claim
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1. A method for determining position of a device connected to a computer network relative to a fixed coordinate system, said method comprising the steps of:

  • estimating position of a device relative to a fixed coordinate system to a first level of accuracy by communicating over a computer network with a model server;

    obtaining data over said computer network regarding signal characteristics of a positioning system relative to said position estimated to said first level of accuracy;

    providing at least one peering point server attached to said computer network, wherein time and frequency references of said at least one peering point server are calibrated to time and frequency references of said positioning system;

    calibrating time and frequency references of said device to said time and frequency references of said at least one peering point server at least in part through communications over said computer network between said device and said at least one peering point servers;

    aligning time and frequency elements in a receiver of said device to signal characteristics of at least one transmitter of said positioning system, wherein said signal characteristics were acquired in said obtaining step;

    receiving a plurality of signals from said at least one transmitter of said positioning system; and

    determining position of said device relative to said fixed coordinate system to a second level of accuracy based at least in part on said calibration and received plurality of signals, wherein said second level of accuracy is more accurate than said first level of accuracy.

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