1. Compensation of drifts in high-Q MEMS gyroscopes using temperature self-sensing.
- Author
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Prikhodko, Igor P., Trusov, Alexander A., and Shkel, Andrei M.
- Subjects
- *
MICROELECTROMECHANICAL systems , *GYROSCOPES , *TEMPERATURE sensors , *COMPUTER algorithms , *SILICON detectors , *SIGNAL-to-noise ratio - Abstract
We present a long-term bias drift compensation algorithm for high quality factor (Q-factor) MEMS rate gyroscopes using real-time temperature self-sensing. This approach takes advantage of linear temperature dependence of the drive-mode resonant frequency for self-compensation of temperature-induced output drifts. The approach was validated using a vacuum packaged silicon Quadruple Mass Gyroscope (QMG), with signal-to-noise ratio (SNR) enhanced by isotopic Q-factors of 1.2 million. Owing to the high Q-factors, measured frequency resolution of 0.01ppm provided a temperature self-sensing precision of 0.0004°C, on par with the state-of-the-art MEMS resonant thermometers. The real-time self-compensation yielded a total bias error of 2°/h and a scale-factor error of 700ppm over temperature range of 25–55°C. The presented approach enabled repeatable long-term rate measurements required for MEMS gyrocompassing applications with a milliradian azimuth precision. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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