Digital signal processing for a micromachined vibratory gyroscope based on a three dimensional adaptive filter demodulator |
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| Affiliation: | 1. Dept. ELEC, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;2. University of Gävle, Kungsbäcksvägen 47, 801 76 Gävle, Sweden;3. Dept. SURF, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;1. Department of Electrical Engr., Inha University, Incheon, Republic of Korea;2. Department of Electrical Engr., Konkuk University, Seoul, Republic of Korea;1. Institute of Clinical Physiology, National Council of Research, via G. Moruzzi 1, 56124 Pisa, Italy;2. Fondazione G. Monasterio CNR – Regione Toscana, via G. Moruzzi 1, 56124 Pisa, Italy;3. Department of Information Engineering, University of Pisa, via Diotisalvi 2, 56126 Pisa, Italy;1. School of Mechanical & Electrical Engineering, Henan University of Technology, Zhengzhou 450007, PR China;2. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, PR China;1. SELECT, VIT University, Chennai Campus, Vandalur-kelambakam road, Chennai 600127, India;2. SMBS, VIT University, Chennai Campus, Vandalur-kelambakam road, Chennai 600127, India;3. Sri Subramanya College of Engineering and Technology, Palani 624615, India;1. School of Industrial Engineering, Purdue University, 315 N Grant St, West Lafayette, IN 47907, USA;2. Clinical Support Group, Roche Diagnostics Corporation, 9115 Hague Rd, PO Box 50547, Indianapolis, IN 46250, USA;3. Department of Laboratory Medicine & Pathology, Mayo Clinic, 200 First St SW, Rochester, MN 55904, USA |
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| Abstract: | This paper reports a digital controller based on a three dimensional adaptive filter demodulator (AFD) for micromachined vibratory gyroscopes with the goal of eliminating common-mode noise and reducing hardware resources. The least mean square (LMS) adaptive filter, which has advantages of fast convergence speed, lower noise and fewer occupied hardware resources, is adopted to demodulate the vibration velocity of the gyroscope and detect its phase shift. A three dimensional AFD is proposed to eliminate the common-mode noise and quadrature coupling induced by the initial capacitance mismatch. Simulation and experimental results have verified the effectiveness of this method. The measurement results of the digital controlled gyroscope show a zero bias drift of 24.6 °/h and a nonlinearity of 0.1% with the measurement range of ±200°/s. |
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| Keywords: | Gyroscope Quadrature demodulation Adaptive filter demodulator LMS |
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