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Proximity determination based on distance ratios

  • US 8,948,782 B2
  • Filed: 12/21/2012
  • Issued: 02/03/2015
  • Est. Priority Date: 12/21/2012
  • Status: Expired due to Fees
First Claim
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1. A method, performed by an apparatus, for determining proximity of a mobile device to a target location, the method comprising:

  • identifying a signal sent by the mobile device and received by respective ones of a set of receivers including at least a first receiver and a second receiver, wherein the first receiver and the second receiver are positioned collinearly to the target location;

    determining a first signal-quality metric observed at the first receiver and a second signal-quality metric observed at the second receiver with respect to the signal;

    computing a ratio associated with distances from the mobile device to the first receiver and the second receiver, respectively, based on the first signal-quality metric and the second signal-quality metric; and

    determining whether the mobile device is within a proximity region defined in relation to the target location based on a comparison of the ratio with a ratio constant which is a ratio of a first distance between each point of a set of points of the proximity region surrounding the target location and the first receiver, and a second distance between the each point of the set of points and the second receiver.

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