Abstract
High-precision disk resonator gyroscope has a high quality factor in order to improve the performance of the gyroscope, as the high quality factor can lead to a long starting time. In this paper, a control system of the driving loop of the disk MEMS resonant gyroscope with the quick start is designed. The control system has functions of quick frequency locking and fast step response. Coarse-precision mode transition system is designed for quick frequency locking. A large-small mode transition system is designed for fast step response. The correctness of the design is verified by circuit test. The test results show that the start-up time is reduced by over 80% compared with the traditional control loop.
Highlights
Navigation includes astronomical navigation, satellite navigation, inertial navigation, radio navigation, etc., among which only inertial navigation is autonomous
Inertial navigation is difficult to disturb as it does not rely on external signals
With the progress of micromachining technology, MEMS gyroscope has been widely used in fields like automotive, consumer electronics, industry, aerospace and other fields because of its small volume, low power consumption and low cost [1,2,3,4,5,6]
Summary
Navigation includes astronomical navigation, satellite navigation, inertial navigation, radio navigation, etc., among which only inertial navigation is autonomous. The start-up time of gyro driving mode mainly includes frequency locking time [11] and step response time. A phaselocked loop is needed to make the frequency of the output signal of DDS equal to the resonance of gyro driving mode. The amplitude of the output signal of the driving mode is very small at start-up, resulting in a long frequency locking time. The increase of the high quality factor of the gyro increases the step response time of driving mode [15]. IInn tthhee sseeccoonnddsseeccttiioonn,,ththeewwoorrkkininggpprrininccipiplele, ,frfreeqquueennccyylolocckkininggcchhaarraacctteerriissttiiccssaanndd sstteepp rreessppoonnssee cchhaarraacctteerriissttiiccss ooff MMEEMMSSddiisskkrreessoonnaattoorrggyyrrooaarreeinintrtroodduucceedd. The start-up time of driving mode mainly includes two parts: frequency locking time and step response time. The amplitude of the of 15 output signal of the driving mode begins to increase This stage can be approximated as a step response. The characteristics of frequency locking and step response of driving mode are analyzed below
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