摘要
提出了一种改进的高精度硅微陀螺仪闭环自激驱动方案。该方案对相角进行了优化控制,消除了驱动频率和驱动模态固有频率的相对频差影响,实现了闭环驱动的相角和增益条件的解耦。利用闭环回路中直流控制量与驱动力间的非线性关系,实现闭环自激控制。试验结果表明,1小时内,驱动频率变化的均方差为0.009Hz,相对变化量为2.2ppm;驱动幅度变化的均方差为0.0025mV,相对变化量为15ppm。由此可见,本方案使驱动频率和幅度稳定性得到了极大提高。
This paper describes a precision closed-loop drive scheme for Silicon Micromachined Vibratory Gyroscope （SMVG）. It decouples the angle and gain of the self-oscillation-driven, optimizes the angle to reduce the relative difference between drive frequency and resonant frequency of the drive mode and achieves the closed-loop serf-oscillation-driven by nonlinear relation between DC voltage using for control and drive force. The experiments show that the standard deviation of drive frequency is 0.009Hz , with relative drift 2.2ppm and the standard deviation of the amplitude is 0.0025mV, with relative drift 15ppm in one hour respectively. The closed-loop drive scheme improves the precision and stability of drive frequency and the amplitude of the gyroscope well.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2006年第3期433-437,468,共6页
Journal of Astronautics
基金
总装备部十五国防预研课题及国家高技术研究发展计划(863计划)
关键词
硅微陀螺仪
闭环
自激驱动
解耦
Silicon micromachined vibratory gyroscope （SMVG）
Closed-loop
Serf-oscillation-driven
Decouple
