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Time of arrival based positioning system

  • US 8,521,181 B2
  • Filed: 09/19/2011
  • Issued: 08/27/2013
  • Est. Priority Date: 09/19/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining, at a wireless network device of a communication network, a round trip transit time between the wireless network device and each of a plurality of reference wireless network devices of the communication network;

    for each of the plurality of reference wireless network devices, determining a distance between the wireless network device and the reference wireless network device based, at least in part, on the round trip transit time between the wireless network device and the reference wireless network device;

    obtaining location coordinates associated with each of the plurality of reference wireless network devices; and

    performing time of arrival (TOA) computations for estimating a location of the wireless network device by executing an iteration of a Taylor series based TOA positioning algorithm based, at least in part, on an initial location of the wireless network device, the distance between the wireless network device and each of the plurality of reference wireless network devices, and an initial distance calibration constant, wherein the initial location is based, at least in part, on an average of the location coordinates associated with each of the plurality of reference wireless network devices.

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