Dead reckoning navigational system using accelerometer to measure foot impacts

  • US 5,583,776 A
  • Filed: 03/16/1995
  • Issued: 12/10/1996
  • Est. Priority Date: 03/16/1995
  • Status: Expired due to Term
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First Claim
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1. A method of determining displacement of a user on foot, the method comprising the following steps:

  • generating a set of accelerations corresponding to foot impacts of the user on a surface;

    determining a peak acceleration in the set of accelerations;

    comparing the peak acceleration to a predetermined minimum threshold value;

    comparing, if the peak acceleration is above the predetermined minimum threshold value, a period of time from a previously detected footstep to the determined peak acceleration;

    determining whether the period of time is greater than a predetermined minimum threshold period of time;

    storing the determined peak acceleration as a detected footstep, if the period of time is determined to be greater than the predetermined minimum threshold period of time; and

    multiplying stored detected footsteps by a scale factor to thereby determine the displacement of the user on foot.

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