Microelectromechanical Hybrid Gyroscope Design of Closed-Loop Detection Circuit Based on FPGA

Abstract:

This paper presents a new microelectromechanical hybrid gyroscope (MHG) with three equilibrium rings. This structure can eliminate the error caused by the double rotation frequency of the driving shaft successfully. The MHG kinematic equations with three equilibrium rings are derived in this paper. Meanwhile, a new digital design and simulation of the MHG closed-loop detection circuit are proposed based on FPGA. The noise interference is weakened by using differential mode signal detection and the resources of FPGA are decreased by the loop diode demodulation in this paper. The cross axis coupling of the decoupled system is about 2.4%. The phase margin is 70deg and the magnitude margin is 22db after correction. The transcient response simulation is tested when the inputs are sinusoidal functions. The bandwidth and scale factors of x-axis and y-axis closed loops are analyzed in the paper. The bandwidth can reach about 70Hz and the scale factors of x-axis and y-axis closed loops are 0.1467V/o/s and -0.1467V/o/s respectively.

• Periodical: Key Engineering Materials (Volumes 562-565)
• Pages: 172-177
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.562-565.172
• Online since: July 2013
• Authors: Dun Zhu Xia, Cheng Yu, Shou Rong Wang, Hong Sheng Li
• Keywords: Detection Circuit, DTG, Microelectromechanical Hybrid Gyroscope

References

[1] Huiliang Cao, Hongsheng Li, Shourong Wang, Bo Yang, Linbin Huang and Kunyu Li. A Novel Silicon Rotor Turned Gyroscope. Navigation and Control 1 (2010), pp.47-50.

DOI: 10.1109/nems.2010.5592238

[2] Jenkins L , Hopkins R E, Kumar K. Hybrid wafer Gyroscope. United Sates Patent: no.6615681B1, 2003.

[3] Bailing Zhou. Design and Fabrication of DTG. Nanjing: Southeast University Press, 2002. (in Chinese)

[4] Bo Yang, Shourong Wang, Kunyu Li, Xi Zhu and Huiliang Cao. Research on a new microelectromechanical hybrid gyroscope. Proceedings of the 2010 IEEE International Conference on Information and Automation. June 20 - 23, Harbin, China, pp.1520-1525.

DOI: 10.1109/icinfa.2010.5512270

[5] Jin Woo Song, Jang Gyu Lee and Taesam Kang. Digital Rebalance Loop Design for a Dynamically Tuned Gyroscope Using H2 Methodology. Control Engineering Practice 10 (2002):1127–1140.

DOI: 10.1016/s0967-0661(02)00079-5

[6] Bin Zhou, Zhongyu Gao, Huai Chen, Rong Zhong and Zhiyong Chen. Digital Readout System for Micromachined gyroscope and its demodulation algorithm. Journal of Tsinghua University (Science & Technology) 5 (2004): 637-690.

[7] Lianchao Zhang, Dapeng Fan, Xinliang Pang and Shixun Fan. Bond Graph Modeling and Simulation of Dynamically Tuned Gyroscope. International Conference on Mechatronics and Automation. August 5 - 8, 2007, Harbin, China, pp.884-889.

DOI: 10.1109/icma.2007.4303662