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Direction finding for legacy bluetooth devices

  • US 10,142,778 B2
  • Filed: 01/07/2016
  • Issued: 11/27/2018
  • Est. Priority Date: 01/07/2016
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an antenna array including at least a first antenna element and a second antenna element separated by a first distance;

    one or more processors; and

    a memory storing instructions that, when executed by the one or more processors, cause the apparatus to;

    receive a first number of bits of a Bluetooth wireless advertising message via the first antenna element;

    receive a second number of bits of the Bluetooth wireless advertising message via the second antenna element, wherein data corresponding to the second number of bits is different than data corresponding to the first number of bits;

    sample the first number of bits of the Bluetooth wireless advertising message received via the first antenna element to obtain a first sampled portion;

    compare the first sampled portion to a corresponding first number of bits of a Bluetooth advertising access address;

    sample the second number of bits of the Bluetooth wireless advertising message received via the second antenna element to obtain a second sampled portion;

    compare the second sampled portion to a corresponding second number of bits of the Bluetooth advertising access address;

    determine a phase difference between the first and second sampled portions based on the comparisons; and

    determine an angle of arrival (AoA) of the Bluetooth wireless advertising message based at least in part on the phase difference and the first distance.

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