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Signal processing method for use with an optical navigation system

  • US 20060106319A1
  • Filed: 11/08/2005
  • Published: 05/18/2006
  • Est. Priority Date: 11/12/2004
  • Status: Active Grant
First Claim
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1. A method for detecting movement of a surface relative to an optical sensor having an array including a plurality of photosensitive elements, the method comprising steps of:

  • sampling each of a number (M) of phase signals from the plurality of photosensitive elements, each of the M signals having a magnitude (Ai) and including a tracking signal at a frequency being tracked and a background signal at other frequencies that offsets the tracking signal, where i, an index of the signals, is a whole number between 0 and M-1;

    eliminating the offset to the tracking signal due to the background signal to generate M non-offset phase signals having a magnitude (A′

    i);

    adjusting phase angles (θ

    i) of the non-offset phase signals to generate M weighted phase signals (A′

    iθ



    i); and

    combining each of the M weighted phase signals (A′

    iθ



    i) to generate an average weighted phase having a phase angle (θ

    ), that when tracked over time indicates a direction and velocity of the movement of an image of the surface mapped to the array.

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