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http://dx.doi.org/10.5302/J.ICROS.2012.18.6.546

Phase Control Loop Design based on Second Order PLL Loop Filter for Solid Type High Q-factor Resonant Gyroscope  

Park, Sang-Jun (Konkuk University)
Yong, Ki-Ryeok (Korea Aerospace Research Institute)
Lee, Young-Jae (Konkuk University)
Sung, Sang-Kyung (Konkuk University)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.18, no.6, 2012 , pp. 546-554 More about this Journal
Abstract
This paper suggests a design method of an improved phase control loop for tracking resonant frequency of solid type precision resonant gyroscope. In general, a low cost MEMS gyroscope adapts the automatic gain control loops by taking a velocity feedback configuration. This control technique for controlling the resonance amplitude shows a stable performance. But in terms of resonant frequency tracking, this technique shows an unreliable performance due to phase errors because the AGC method cannot provide an active phase control capability. For the resonance control loop design of a solid type precision resonant gyroscope, this paper presents a phase domain control loop based on linear PLL (Phase Locked Loop). In particular, phase control loop is exploited using a higher order PLL loop filter by extending the first order active PI (Proportion-Integral) filter. For the verification of the proposed loop design, a hemispherical resonant gyroscope is considered. Numerical simulation result demonstrates that the control loop shows a robust performance against initial resonant frequency gap between resonator and voltage control oscillator. Also it is verified that the designed loop achieves a stable oscillation even under the initial frequency gap condition of about 25 Hz, which amounts to about 1% of the natural frequency of a conventional resonant gyroscope.
Keywords
phase control; resonant frequency tracking; PLL; resonant gyroscope; loop filter;
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Times Cited By KSCI : 2  (Citation Analysis)
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