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Short range RF monitoring system

  • US 9,167,548 B2
  • Filed: 04/22/2009
  • Issued: 10/20/2015
  • Est. Priority Date: 04/23/2008
  • Status: Active Grant
First Claim
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1. A wireless short range radio-frequency master device being a mobile telecommunications device adapted to maintain a portable private network of wireless short range radio-frequency slave devices, wherein the master device is configured to:

  • receive, at a plurality of orientations of the master device, a plurality of signals from two or more slave devices, wherein the plurality of signals are transmitted using variable strengths,determine, by comparing strengths of the plurality of signals, a calculated proximity of the two or more slave devices with respect to the master device, wherein the calculated proximity is associated with a physical distance between the master device and a slave device,determine from differences in the strengths of the plurality of signals, a direction of the two or more slave devices relative to the master device,enable definition of a set of slave devices selected from the two or more slave devices, andbased on the determined calculated proximity and the determined direction, enable a user to monitor members of the set.

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