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Tracking entities by means of hash values

  • US 9,600,443 B2
  • Filed: 01/14/2013
  • Issued: 03/21/2017
  • Est. Priority Date: 01/30/2012
  • Status: Expired due to Fees
First Claim
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1. A computer-implemented method, performed in a first sensor device, for tracking a movable entity, wherein the movable entity is a physical entity within a physical space, the method comprising:

  • a) synchronizing, with one or more other sensor devices, a first data value corresponding to a first time slot associated with a current time, the first time slot being one of a series of time slots shared by all the sensor devices;

    b) generating a set of data based on sensing of one or more attributes of the movable entity, wherein the set of data is uniquely identifiable data that uniquely identifies the movable entity;

    c) calculating identifying data from the generated set of data for identifying the movable entity based on the identifying data, wherein the identifying data is a reduced size set of data relative to the generated set of data and is directed to identifying characteristics of the movable entity within the generated set of data;

    d) calculating derivative identifying data by applying a modifying function on the identifying data, the modifying function using the identifying data as first input value and using the first data value as a second input value for modifying the identifying data based on the first data value, wherein the derivative identifying data is anonymized data which does not uniquely identify the movable entity;

    e) calculating a first hash value at least by applying a hash function to the derivative identifying data; and

    f) sending a message from the first sensor device to a central server for determining the position of the movable entity, the message comprising the hash value and an identifier of the first sensor device.

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