Non-inertial calibration of vibratory gyroscopes
AssigneeCalifornia Institute of Technology
InventorsRoman C. Gutierrez, Tony K. Tang
Life of this patent
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Abstract
The electrostatic elements already present in a vibratory gyroscope are used to simulate the Coriolis forces. An artificial electrostatic rotation signal is added to the closed-loop force rebalance system. Because the Coriolis force is at the same frequency as the artificial electrostatic force, the simulated force may be introduced into the system to perform an inertial test on MEMS vibratory gyroscopes without the use of a rotation table.
Claims18
A method of calibrating a vibratory gyroscope comprising:
- introducing a simulated rotation signal to the gyroscope;
- detecting a sense motion created by the rotation signal;
- combining a sense motion correction signal with the simulated rotation signal.
A method of calibrating a vibratory gyroscope comprising:
- driving a single axis of the gyroscope;
- sensing a motion in a sense resonance;
- adding an electronic rotation signal to a sense force motion correction signal;
- and
- determining a change in the motion in the sense resonance due to the rotation signal.
A calibration system for a vibratory gyroscope comprising:
- a drive motion excitation circuit which drives the gyroscope;
- a sense motion detector which determines a motion of the vibratory gyroscope in a sense direction;
- and
- a rotation simulator which generates a rotation signal to simulate natural Coriolis forces of the vibratory gyroscope, the rotation signal being applied to the vibratory gyroscope.
Dependencies are inferred from the claim text.