Patent ID: 6651499
Filing Date: 2003-11-25
Classification: G01C

Abstract:
A control system for vibrating structure gyroscope having a vibrating structure, primary drive means and secondary drive means for putting and maintaining the vibrating structure in primary mode vibratory resonance, and primary pick-off means and secondary pick-off means for detecting vibration of the vibrating structure, which system includes a primary closed control loop for controllably varying the drive signal applied to the primary drive means, a secondary closed control loop for controllably varying the drive signal applied to the secondary drive means in order to maintain a null value at the secondary pick-off means, and means for actively adjusting the scalefactor in the primary and secondary closed control loops which scalefactor active adjustment means includes means for dividing a rate response signal from the secondary control loop by a signal indicative of the amplitude of the primary mode vibration, means for filtering an output signal from the dividing means to provide an output indicative of the applied rate, and a variable scalefactor loop for receiving the output signal from the dividing means and using it actively to adjust a reference voltage set level of the primary closed control loop and thereby dynamically adjust the in loop scalefactor of the control system.