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Determining the distance between devices in a wireless data exchange protocol

  • US 10,701,514 B2
  • Filed: 03/15/2017
  • Issued: 06/30/2020
  • Est. Priority Date: 03/15/2016
  • Status: Active Grant
First Claim
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1. A method of determining a distance between a first and a second device in a wireless data exchange protocol, the method comprising:

  • sending an advertising channel Protocol Data Unit (PDU) from the first device via a first carrier signal;

    receiving the advertising channel PDU at the second device and responsively demodulating the received advertising channel PDU and sending a scan request scanning PDU from the second device to the first device using the demodulated advertising channel PDU as a reference signal when generating a second carrier signal for the scan request PDU;

    receiving the scan request scanning PDU at the first device and responsively demodulating the received scan request scanning PDU to obtain the PDU dataand, at one of the devices, comparing the first carrier signal and the second carrier signal by generating in-phase and quadrature DC signals to determine a phase shift between the first and second carrier signals, andbased on the comparison calculating using a processor of the device a time of flight (TOF) for at least one of the sent PDUs; and

    determining the distance between the first and second devices using the calculated TOF.

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