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Bluetooth based motion detection systems

  • US 10,462,633 B2
  • Filed: 06/13/2017
  • Issued: 10/29/2019
  • Est. Priority Date: 03/10/2017
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • one or more transceivers configured to receive wireless signals from a transmitting device via a plurality of receive antennas;

    one or more processors; and

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

    receive, from the transmitting device, a reference packet containing a reference sequence;

    determine phase differences between signal components of the reference sequence arriving via the plurality of receive antennas;

    determine a reference angle based at least in part on the determined phase differences;

    receive, from the transmitting device, a wireless signal via the plurality of receive antennas, the wireless signal including a packet containing a sequence known by the apparatus;

    determine phase differences between signal components of the sequence arriving via the plurality of receive antennas;

    determine at least one of an angle of arrival (AoA) or an angle of departure (AoD) of the packet based at least in part on the determined phase differences;

    determine a difference between at least one of the AoA or the AoD and the reference angle; and

    detect a presence or absence of motion of an object other than the apparatus or the transmitting device in the vicinity of the apparatus and the transmitting device based on the determined difference.

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