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Method and apparatus for measuring distance in a wireless environment

  • US 8,330,648 B2
  • Filed: 02/20/2009
  • Issued: 12/11/2012
  • Est. Priority Date: 02/20/2008
  • Status: Expired due to Fees
First Claim
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1. A method for measuring a distance in a wireless environment, comprising:

  • transmitting a distance measurement signal to a second device and receiving at least one response signal for the transmitted distance measurement signal from the second device by a first device;

    matching a received response signal waveform with a reference signal waveform to detect a peak value of an earliest response signal waveform by the first device;

    detecting the peak value of the earliest response signal waveform using a result of the matching by the first device; and

    calculating a time taken from the transmission of the distance measurement signal to the second device and the reception of the response signal from the second device using a peak value of the earliest response signal by the first device,wherein a pulse width of the reference signal is computed by;


    reference pulse width=α

    ×

    single pulse widthwhere α

    denotes a value proportional to Received Signal Strength Indication (RSSI), and single pulse width is defined as a pulse width measured at a reference RSSI, andwherein the peak value of the reference signal is detected according to the pulse width of the reference signal.

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