Calibration of vibratory gyroscope
First Claim
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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Accused Products
Abstract
A gyroscopic system comprises at least four vibratory gyroscopes capable of changing vibration position. A first measurement is provided by a gyroscope to be calibrated and a second measurement is provided by a combination of the respective measurements from the other gyroscopes of the system, these first and second measurements being carried out along the same measurement axis. The determination (12) of a measurement drift value between the first measurement and the second measurement is followed by a command (13) to change the vibration position of the gyroscope to be calibrated to another vibration position and a drift value is again determined. The vibration position change command and the determination of a drift value are repeated (14) K times, K being a positive integer. Then, a drift model is generated (15) as a function of the vibration position of the gyroscope to be calibrated on the basis of the drift values obtained.
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Citations
13 Claims
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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;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 one of 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 gyroscopic system comprising, in order to calibrate the gyroscope to be calibrated;a determination unit capable of determining a measurement drift value between said first measurement and said second measurement; a command unit capable of commanding the change in vibration position of the gyroscope to be calibrated to another vibration position of said plurality of vibration positions and requiring the determination of a drift value by the determination unit; and a generation unit capable of generating a drift model as a function of the vibration position of the gyroscope to be calibrated on the basis of the drift values provided by the determination unit; wherein the at least three gyroscopes to be calibrated are calibrated by generation of a drift model by applying said determination unit to each of the gyroscopes successively, then said command unit K times, K being a positive integer to each of the gyroscopes successively, then said generation unit to each of the gyroscopes successively. - View Dependent Claims (10, 11, 12, 13)
- a first measurement being provided by one of 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;
Specification