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Signal processing system for inertial sensor

  • US 5,983,718 A
  • Filed: 07/14/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 07/14/1997
  • Status: Expired due to Term
First Claim
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1. Apparatus for processing signals output from a sensor to measure angular rate, comprising:

  • dither apparatus for driving the sensor with an oscillatory angular velocity signal having a frequency ω

    D ;

    a demodulator connected to the sensor to demodulate signals output therefrom with a signal proportional to cos (ω

    D t) to produce a rate output signal (s); and

    a feedback loop connected between the sensor output and the dither apparatus, the feedback loop including;

    a servo compensator connected to receive signals output from the sensor; and

    a notch filter connected between the servo compensator and the sensor, the notch filter being arranged to reject signals of the dither frequency ω

    D to make the feedback loop carry no signal that would produce feedback torque in the sensor at the dither frequency, such that relative motion of the sensor is a direct measure of the angular rate.

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