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Sensors 2012, 12(5), 6434-6446; doi:10.3390/s120506434

Temperature Drift Compensation for Hemispherical Resonator Gyro Based on Natural Frequency

1,* , 1
1 College of Mechanical Engineering and Automation, National University of Defense Technology, Changsha 410073, Hunan Province, China 2 Institution of Piezoelectric and Acousto-optic Technology, Chongqing 400060, China
* Author to whom correspondence should be addressed.
Received: 12 March 2012 / Revised: 4 May 2012 / Accepted: 9 May 2012 / Published: 15 May 2012
(This article belongs to the Section Physical Sensors)
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Temperature changes have a strong effect on Hemispherical Resonator Gyro (HRG) output; therefore, it is of vital importance to observe their influence and then make necessary compensations. In this paper, a temperature compensation model for HRG based on the natural frequency of the resonator is established and then temperature drift compensations are accomplished. To begin with, a math model of the relationship between the temperature and the natural frequency of HRG is set up. Then, the math model is written into a Taylor expansion expression and the expansion coefficients are calibrated through temperature experiments. The experimental results show that the frequency changes correspond to temperature changes and each temperature only corresponds to one natural frequency, so the output of HRG can be compensated through the natural frequency of the resonator instead of the temperature itself. As a result, compensations are made for the output drift of HRG based on natural frequency through a stepwise linear regression method. The compensation results show that temperature-frequency method is valid and suitable for the gyroscope drift compensation, which would ensure HRG’s application in a larger temperature range in the future.
Keywords: Hemispherical Resonator Gyro (HRG); natural frequency; temperature compensation; drift Hemispherical Resonator Gyro (HRG); natural frequency; temperature compensation; drift
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, X.; Wu, W.; Fang, Z.; Luo, B.; Li, Y.; Jiang, Q. Temperature Drift Compensation for Hemispherical Resonator Gyro Based on Natural Frequency. Sensors 2012, 12, 6434-6446.

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