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METHOD OF MEASURING POSITION AND ORIENTATION WITH IMPROVED SIGNAL TO NOISE RATIO

  • US 20040088136A1
  • Filed: 11/01/2002
  • Published: 05/06/2004
  • Est. Priority Date: 11/01/2002
  • Status: Active Grant
First Claim
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1. A method of measuring position and orientation of an object in a prescribed space, including the steps of:

  • a) providing a multi-axis transmitter located adjacent said space;

    b) providing a multi-axis receiver attached to said object;

    c) providing driver means for driving each transmitter axis to emit a square DC-based waveform upon command from a computer having an integrator;

    d) driving said transmitter such that a waveform emitted by one axis thereof does not overlap with a waveform emitted by another axis thereof;

    e) providing each waveform with the following configurations;

    i) beginning a rising edge at time T1;

    ii) beginning a steady state at maximum amplitude at time T2;

    iii) beginning a falling edge at time T3;

    iv) beginning a steady state at minimum amplitude at time T4; and

    v) beginning a next rising edge at time T5;

    vi) wherein a time period T1 to T3 equals a time period T3 to T5;

    f) activating a first axis of said transmitter;

    g) receiving signals at said receiver and conveying said signals to said computer;

    h) integrating said signals using said integrator from time T1 to T3 to obtain integration A;

    i) integrating said signals using said integrator from time T3 to T5 to obtain integration B;

    j) subtracting integration B from integration A to obtain final result C;

    k) repeating steps f)-j) for each axis of said transmitter.

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