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Inertial orientation tracker apparatus method having automatic drift compensation for tracking human head and other similarly sized body

  • US 5,807,284 A
  • Filed: 06/25/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 06/16/1994
  • Status: Expired due to Term
First Claim
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1. A method for generating a signal that corresponds to at least two degrees of freedom of orientation relative to a reference frame of a body having a size between the sizes of a human finger and a human torso, said method comprising the steps of:

  • a. physically coupling to said body, a first self contained sensor that is impervious to interference from electromagnetic, acoustic, optical and mechanical sources and is subject to drift over time;

    b. physically coupling to said body, a second self contained sensor that is relatively impervious to drift over time;

    c. using said first sensor, generating a drift sensitive orientation signal that corresponds to said at least two degrees of freedom of orientation of said body and that is impervious to interference from electromagnetic, acoustic, optical and mechanical sources and is subject to drift over time;

    d. using said second self contained sensor, generating a drift compensating orientation signal that corresponds to said at least two degrees of freedom of orientation of said body which is relatively impervious to drift over time; and

    e. generating a corrected orientation signal based on said drift sensitive and drift compensating orientation signals.

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