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A dual-mode gyroscope architecture with in-run mode-matching capability and inherent bias cancellation
Ist Teil von
2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015, p.23-26
Ort / Verlag
IEEE
Erscheinungsjahr
2015
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
This paper introduces a novel dual-mode actuation and sensing scheme for readout and calibration of axisymmetric Coriolis resonant gyroscopes. The proposed scheme actuates both gyroscope modes simultaneously with the same in-phase excitation, senses both modes concurrently, and utilizes the sum and difference of the sense signals to demonstrate complete cancellation of the gyroscope bias terms, and provide automatic in-run mode-matching capability. Moreover, the architecture provides twofold enhancement of angular rate sensitivity and signal-to-noise performance, as compared to conventional single-mode excitation of the same gyroscope. We demonstrate, for the first time 45× reduction in temperature drift of bias of a 2.6 MHz 650 μm diameter substrate-decoupled BAW gyroscope and a bias stability of 5.4 °/hr, paving the way towards near-zero-drift gyroscopes.