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Synchronous FM digital detector

  • US 4,712,426 A
  • Filed: 10/21/1985
  • Issued: 12/15/1987
  • Est. Priority Date: 10/21/1985
  • Status: Expired due to Term
First Claim
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1. A system for determining the angular rate of rotation of a body about a rate axis, the system comprising:

  • first and second accelerometers having their sensitive axes parallel to a sensing axis perpendicular to the rate axis, the first and second accelerometers being adapted to produce respective first and second output signals, each output signal having a frequency corresponding to the acceleration experienced by the respective accelerometer along its sensitive axis;

    movement means including means for producing a periodic movement signal and means responsive to the movement signal for periodically moving the accelerometers along a movement axis perpendicular to the rate and sensing axes, whereby each output signal includes a periodic Coriolis component; and

    processing means comprising means for producing a reference signal that is operative to define one or more first time periods during which the Coriolis components have one polarity and one or more second time periods during which the Coriolis components have the opposite polarity, the first and second time periods together comprising one or more complete periods of the movement signal, means for determining, for each output signal, a phase value representing the difference between the phase change of the output signal during the first time periods and the phase change of the output signal during the second time periods, means for adding the phase values to one another to determine a phase sum value and for subtracting the phase values from one another to determine a phase difference value, and means for linearly combining the phase sum and phase difference values to determine a value representing the angular rate of rotation of the body about the rate axis.

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