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Laser gyro dither drive

  • US 5,225,889 A
  • Filed: 12/11/1991
  • Issued: 07/06/1993
  • Est. Priority Date: 12/11/1991
  • Status: Expired due to Term
First Claim
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1. A direct digital dither drive apparatus for a laser gyro having a dithered gyro block with a dither motor and dither pickoff, the direct digital dither drive comprising:

  • a. a means for sensing the dither pickoff connected to the dither pickoff and having a dither pickoff output;

    b. a means for amplifying the dither pickoff output having an amplified dither pickoff output;

    c. a means for analog to digital conversion connected to the amplified dither pickoff output having a digital dither signal output;

    d. a means for digital control connected to the digital dither signal output having a pulse width modulated signal output wherein the digital control means generates the pulse width modulated signal in proportion to the digital dither output minus a reference displacement plus a predetermined amount of random noise; and

    e. a means for driving the dither motor in response to the pulse width modulated signal having a dither drive signal connected to the dither motor.

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