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Calibration of vibratory gyroscope

  • US 8,424,363 B2
  • Filed: 11/27/2009
  • Issued: 04/23/2013
  • Est. Priority Date: 11/28/2008
  • Status: Active Grant
First Claim
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1. Method of calibrating at least three gyroscopes to be calibrated in a gyroscopic system comprising at least four vibratory gyroscopes capable of changing vibration position among a plurality of vibration positions;

  • a first measurement being provided by each of said at least three gyroscopes to be calibrated and a second measurement being provided by a combination of the respective measurements from the other gyroscopes of said system, said first and second measurements being carried out along the same measurement axis;

    said calibration method comprising the following steps, for each of the at least three gyroscopes to be calibrated which vibrates in one of the vibration positions;

    /1/ determining a measurement drift value between said first measurement and said second measurement;

    /2/ commanding the change in vibration position of the gyroscope to be calibrated to another vibration position of said plurality of vibration positions and iterating step /1/;

    /3/ iterating step /2/K times, K being a positive integer; and

    /4/ generating a drift model as a function of the vibration position of the gyroscope to be calibrated on the basis of the drift values obtained in the iterations of step /1/;

    wherein the at least three gyroscopes to be calibrated are calibrated by generation of a drift model by applying step /1/ to each of the gyroscopes successively, then step /2/ to each of the gyroscopes successively, then step /3/ to each of the gyroscopes successively and finally step /4/ to each of the gyroscopes successively.

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