Method for electronic tuning of the read oscillation frequency of a coriolis gyro

• US 20060101910A1
• Filed: 10/07/2003
• Published: 05/18/2006
• Est. Priority Date: 10/18/2002
• Status: Active Grant

• Current Assignee: Litec-LP GmbH
• Original Assignee: Litec-LP GmbH
• Inventors: Schroeder, Werner
• Granted Patent: US 7,278,312 B2
• Time in Patent Office: Days
• US Class Current: 73/504.80
• CPC Class Codes: G01C 19/5776 Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719

Abstract

In a method for electronic tuning of the frequency of the read oscillation to the frequency of the stimulation oscillation in a Coriolis gyro the resonator of the Coriolis gyro has a disturbance force applied to it such that the stimulation oscillation remains essentially uninfluenced. The read oscillation is changed so that a read signal that represents the read oscillation contains a corresponding disturbance component. The disturbance force is defined as the force caused by the signal noise in the read signal. The frequency of the read oscillation is controlled so that the strength of the disturbance component contained in the read signal is a minimum.

Claims

1. A method for electronic tuning of the frequency of the read oscillation to the frequency of the stimulation oscillation in a resetting Coriolis gyro, wherein

the resonator of the Coriolis gyro has a disturbance force applied to it such that

a) the stimulation oscillation remains essentially uninfluenced, and

b) the read oscillation is changed such that a read signal which represents the read oscillation, contains a corresponding disturbance component, wherein

the disturbance force is defined as that force which is caused by the signal noise in the read signal, and

the frequency of the read oscillation is controlled such that the magnitude of the disturbance component, which is contained in the read signal, is as small as possible.

2. The method as claimed in claim 1, characterized in that the signal noise is the noise of the tapping electronics.

3. The method as claimed in claim 1, characterized in that the disturbance component is determined from a signal which is applied to a quadrature regulator in the quadrature control loop, or is emitted from it.

4. The method as claimed in claim 1, characterized in that the disturbance component is determined from a signal which is applied to a rotation rate regulator in the rotation rate control loop, or is emitted from it.

5. The method as claimed in claim 1, characterized in that the frequency of the read oscillation is controlled by controlling the intensity of an electrical field in which a part of the resonator of the Coriolis gyro oscillates.

6. A Coriolis gyro, characterized by a device for electronic tuning of the frequency of the read oscillation to the frequency of the stimulation oscillation, having:

a noise detection unit which determines the noise component of a read signal which represents the read oscillation, and

a control unit which controls the frequency of the read oscillation such that the magnitude of the noise component, which is contained in the read signal, is as small as possible.

7. The Coriolis gyro as claimed in claim 6, characterized in that the noise detection unit determines the noise component from a signal which is applied to a rotation rate regulator in a rotation rate control loop in the Coriolis gyro, or is emitted from it.

8. The Coriolis gyro as claimed in claim 6, characterized in that the noise detection unit determines the noise component from a signal which is applied to a quadrature regulator in a quadrature control loop in the Coriolis gyro, or is emitted from it.