Continuous mode reversal for rejecting drift in gyroscopes

US9846055B2 · kind B2 · utility

Assignee

• The Regents of the University of California · US

Inventors

• Bernhard Boser · Berkeley, US
• Mitchell Kline · Alameda, US
• Igor Izyumin · Oakland, US
• Yu-Ching Yeh · Berkeley, US
• Burak Eminoglu · Berkeley, US

Key dates

• Filing date: Oct 15, 2015
• Grant date: Dec 19, 2017
• Expiry date: Feb 19, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01C19/5776
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A vibratory gyroscope system is described which utilizes a mechanical resonator having a first mode of vibration and an associated first natural frequency, and a second mode of vibration having an associated second natural frequency. The angular rate of motion input couples energy between the first and second modes of vibration. The gyroscope has driver circuits, sensors and actuators for the first and second modes. The invention utilizes a bias error shifting method which provides for shifting the bias error away from DC to a higher frequency, where it can be removed by low pass filtering. As a result of the inventive method, gyroscope systems can be produced with significantly lower bias error.