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Synchronization-free station locator in wireless network

  • US 8,565,133 B2
  • Filed: 07/03/2012
  • Issued: 10/22/2013
  • Est. Priority Date: 09/03/2009
  • Status: Expired due to Fees
First Claim
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1. A method of providing synchronization-free station locating in a wireless network, the wireless network including a first device having an unknown location and a second device having a known location, the method comprising:

  • (a) sending a first packet from the second device to the first device, the first packet being one of a unicast packet and a probe response packet, the first packet having a time of departure TOD(D);

    (b) receiving the first packet at the first device, the first packet having a time of arrival TOA(D);

    (c) sending an acknowledgement packet from the first device to the second device, the acknowledgment packet having a time of departure TOD(D_ACK);

    (d) receiving the acknowledgment packet at the second device, the acknowledgment packet having a time of arrival TOA(D_ACK); and

    (e) computing a distance between the first device and the second device using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D);

    (f) moving the second device to another known location and repeating (a)-(e); and

    (g) using a plurality of computed distances between the first and second devices to determine a location of the first device.

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