Two frequency gyroscope compensation system and method
First Claim
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1. A method for testing a frequency response of a sense oscillator of a gyroscope, the method comprising:
- driving a drive oscillator of the gyroscope at a drive frequency;
driving the sense oscillator at a first test frequency simultaneously with driving the drive oscillator, wherein the first test frequency is distinct from the drive frequency;
driving the sense oscillator at a second test frequency simultaneously with driving the drive oscillator, wherein the second test frequency is distinct from the drive frequency and the first test frequency;
measuring a first test response of the sense oscillator at the first test frequency;
measuring a second test response of the sense oscillator at the second test frequency;
determining a change in the frequency response of the sense oscillator based on the first test response and the second test response, wherein determining the change in the frequency response of the sense oscillator comprises determining a first gain change for the first test response, a second gain change for the second test response, and a ratio of the first gain change and the second gain change; and
modifying one or more operational parameters of the gyroscope based on the change in the frequency response.
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Abstract
A gyroscope is driven at a drive frequency and senses a Coriolis force caused by rotation of the gyroscope. The response of the gyroscope to a given Coriolis force may change due to changes in the gyroscope over time. A plurality of test frequencies are applied to the gyroscope, and the response of the gyroscope to those test frequencies is analyzed in order to track changes in the response of the gyroscope. Operational parameters of the gyroscope may be altered in order to compensate for those changes.
13 Citations
28 Claims
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1. A method for testing a frequency response of a sense oscillator of a gyroscope, the method comprising:
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driving a drive oscillator of the gyroscope at a drive frequency; driving the sense oscillator at a first test frequency simultaneously with driving the drive oscillator, wherein the first test frequency is distinct from the drive frequency; driving the sense oscillator at a second test frequency simultaneously with driving the drive oscillator, wherein the second test frequency is distinct from the drive frequency and the first test frequency; measuring a first test response of the sense oscillator at the first test frequency; measuring a second test response of the sense oscillator at the second test frequency; determining a change in the frequency response of the sense oscillator based on the first test response and the second test response, wherein determining the change in the frequency response of the sense oscillator comprises determining a first gain change for the first test response, a second gain change for the second test response, and a ratio of the first gain change and the second gain change; and modifying one or more operational parameters of the gyroscope based on the change in the frequency response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A gyroscope, comprising:
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a drive oscillator; one or more drive electrodes to drive the drive oscillator at a drive frequency; a sense oscillator, wherein the sense oscillator is driven at a first test frequency and a second test frequency, wherein the first test frequency is distinct from the drive frequency, wherein the second test frequency is distinct from the drive frequency and the first test frequency, and wherein the sense oscillator is driven at the first test frequency and second test frequency simultaneously with the driving of the drive oscillator at the drive frequency; one or more sense electrodes to provide a first test response signal in response to an oscillation of the sense oscillator at the first test frequency and a second test response signal in response to an oscillation of the sense oscillator at the second test frequency; processing circuitry configured to determine a change in the frequency response of the sense oscillator based on the first test response signal and the second test response signal, and to modify one or more operational parameters of the gyroscope based on the change in the frequency response, wherein the determination of the change in the frequency response of the sense oscillator comprises a determination of a first gain change for the first test response signal, a second gain change for the second test response signal, and a ratio of the first gain change and the second gain change. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification