Patent ID: 7188522
Filing Date: 2007-03-13
Classification: G01C

Abstract:
1. A method for adjustment of a rotation rate sensor having a vibration gyro, a first input and a first output of the vibration gyro being part of a primary control loop which excites the vibration gyro by supplying an excitation signal to the first input at a natural frequency of the vibration gyro, a second input and a second output of the vibration gyro being part of a secondary control loop, said method comprising the steps of: tapping an output signal from the second output, and demodulating the tapped output signal, after amplification and analog/digital conversion, to form an in-phase component and a quadrature component; modulating the in-phase and quadrature components, after filtering, and combining the modulated in-phase and quadrature components to form a driver signal; supplying the driver signal to the second input; deriving a rotation rate signal from the in-phase component; adding correction values to the in-phase component and the quadrature component when the vibration gyro is not moving; varying the correction values and performing the step of adding with the varied correction values until the in-phase component and the quadrature component are each at a minimum value; and after said step of varying, storing the correction values which generate the minimum value of the in-phase and quadrature components in a non-volatile memory and using the stored correction values during operation of the rotation rate sensor.