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Energy-efficient indoor localization system and a method of reducing power consumption of a radio badge in the indoor localization system

  • US 8,159,333 B2
  • Filed: 04/16/2009
  • Issued: 04/17/2012
  • Est. Priority Date: 11/25/2008
  • Status: Active Grant
First Claim
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1. A method of reducing power consumption of a radio badge in a localization system, the radio badge being carried by a tracked target and being provided with a pedometer for detecting a footstep count of the tracked target, said method comprising:

  • (a) estimating a velocity of the radio badge according to the footstep count detected by the pedometer;

    (b) calculating a sleep time from the velocity of the radio badge; and

    (c) controlling the radio badge to discontinue emitting radio signals during the sleep time;

    wherein, in step (b), the sleep time is calculated using the following equation;


    sleep time=(error tolerance−

    estimation error)/velocity−

    processing and network delay,where error tolerance, estimation error, and processing and network delay are given application-specific or system parameters, and velocity is the velocity estimated in step (a).

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