ACCELEROMETER DERIVED GYRO VIBRATION RECTIFICATION ERROR COMPENSATION
First Claim
1. An apparatus compensating for vibration rectification error present in a MEMS gyroscope output signal indicative of rotation about an axis of rotation normal to an operative plane, the MEMS gyroscope affixed to a mount, the apparatus comprising:
- at least one accelerometer situated on the mount to generate a vibration signal indicating acceleration of the mount along the axis of rotation;
a processor to generate a compensation signal based upon the signal; and
an output stage to amplify the gyroscope output signal according to the compensation signal.
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Accused Products
Abstract
An apparatus compensates for vibration rectification error present in a MEMS gyroscope output signal. The MEMS gyroscope has an axis of rotation normal to an operative plane. The apparatus includes at least one accelerometer situated to generate an acceleration signal indicating acceleration along the axis of rotation. A processor generates a compensation signal based upon the acceleration signal. An output stage amplifies the gyroscope output signal according to the compensation signal. The processor retrieves compensation data from a processor-readable memory according to the acceleration signal. The compensation signal is further based upon the compensation data.
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Citations
18 Claims
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1. An apparatus compensating for vibration rectification error present in a MEMS gyroscope output signal indicative of rotation about an axis of rotation normal to an operative plane, the MEMS gyroscope affixed to a mount, the apparatus comprising:
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at least one accelerometer situated on the mount to generate a vibration signal indicating acceleration of the mount along the axis of rotation; a processor to generate a compensation signal based upon the signal; and an output stage to amplify the gyroscope output signal according to the compensation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for developing a compensation data residing on a processor-readable memory, the method comprising:
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vibrating a mount at a vibration frequency and a vibration amplitude, the mount having at least one MEMS gyroscope generating a MEMS gyroscope signal indicating rotation about an axis of rotation and at least one accelerometer generating an accelerometer signal indicative of vibration along the axis of rotation; receiving the accelerometer signal and the gyroscope signal at a signal processor; and deriving a vibration signal to include frequency and amplitude data and based upon the accelerometer signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A signal processor assembly responsive to an accelerometer signal, the processor assembly comprising:
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a processor-readable memory storing; a compensation signal look-up table for retrieving compensation factors based upon a vibration signal; a processor having; an input for receiving an acceleration signal; a processing stage for deriving a compensation bias based upon the acceleration signal and at least one compensation coefficient retrieved from the memory based upon the vibration signal; and an output stage for supplying the bias to an output signal of a MEMS gyroscope. - View Dependent Claims (18)
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Specification