A Dual-Mode Actuation and Sensing Scheme for In-Run Calibration of Bias and Scale Factor Errors in Axisymmetric Resonant Gyroscopes

被引:42
作者
Norouzpour-Shirazi, Arashk [1 ]
Ayazi, Farrokh [1 ]
机构
[1] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
关键词
Auto-calibration; axisymmetric gyroscope; gyroscope bias calibration; gyroscope scale factor calibration; in-run mode-matching; MEMS gyroscope; self-calibration;
D O I
10.1109/JSEN.2017.2787613
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper demonstrates a dual-mode actuation and sensing scheme for differential operation and self-calibration of axisymmetric Coriolis resonant gyroscopes. The proposed scheme actuates both modes of an axisymmetric gyroscope with two identical in-phase excitation signals, and senses both modes concurrently. This dual-mode actuation architecture utilizes the difference of the individual mode outputs to cancel out the common-mode bias terms, and provide rate-independent frequency split monitoring. The symmetry of the dual-mode architecture can be utilized to provide in-run scale factor calibration capability by mimicking the mechanical Coriolis force in the electrical domain, thereby providing a virtual electrical rotation to the gyroscope, to estimate the drift of the physical scale factor over time and temperature. The dual-mode architecture is demonstrated on a 2.625-MHz substrate-decoupled bulk acoustic wave gyroscope. The inherent bias cancellation provides sub10 degrees/hr bias instability, with 1.4x improvement of angle random walk, as compared with the conventional single-mode actuation scheme. Benefiting from the in-run mode-matching capability, the dual-mode actuation scheme exhibits 45x reduction of bias drift over a temperature range of [10-80] degrees C. In-run scale factor calibration achieves 150x reduction of scale factor turn-on repeatability error down to 62 ppm, and over 100x reduction of the temperature drift of scale factor over [ 10-50]degrees C.
引用
收藏
页码:1993 / 2005
页数:13
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