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Method and system for locating wireless devices within a local region

  • US 9,958,533 B2
  • Filed: 02/21/2014
  • Issued: 05/01/2018
  • Est. Priority Date: 09/06/2013
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving Global Positioning System (GPS) data describing global locations for a plurality of wireless devices;

    identifying a set of local wireless devices from the plurality of wireless devices, the set of local wireless devices being within a local region determined according to the GPS data;

    transmitting, to each wireless device within the set of local wireless devices, a message to perform RFID range finding, wherein RFID range finding comprises;

    selecting a plurality of wireless devices within the set of local wireless devices;

    sending, by each wireless device within the selected plurality of wireless devices, an original signal to all other wireless devices within the set of local wireless devices;

    receiving, by the respective wireless device within the selected plurality of wireless devices, a range finding measurement from each of the other wireless devices within the set of local wireless devices, wherein each range finding measurement is a backscattered modulated signal;

    determining a respective relative location of each wireless device within the set of local wireless devices based on a plurality of range finding measurements; and

    transmitting, to each wireless device within the set of local wireless devices, the respective relative location of each wireless device within the set of local wireless devices.

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