具有增益补偿功能的微机械陀螺数字化驱动闭环  

Digital drive closed-loop with gain compensation for micro-machined gyroscope

作　　者：杨亮[1] 苏岩[1] 裘安萍[1] 夏国明[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《光学精密工程》2014年第1期109-116,共8页Optics and Precision Engineering

基　　金：国防预研基金资助项目(No.9140A09011011BQ02)

摘　　要：提出了具有增益补偿功能的数字化驱动闭环方法,以便提高微机械陀螺标度因数的稳定性。介绍了微机械陀螺的工作原理,对其运动方程的分析显示:为了提高标度因数的稳定性,需要提高陀螺驱动模态振动速度的稳定性;而振动速度的稳定性与驱动环路中C/V转换电路增益的稳定性相关。为此,设计了增益补偿算法,配合自动增益控制环节和锁相环环节构建了具有增益补偿功能的数字化驱动闭环。仿真结果表明,在C/V转换电路增益相对变化量为7.4%时,振动速度幅值的相对变化量由无增益补偿时的7.29%降到了有增益补偿时的0.12%。实验结果表明,增加增益补偿环节后,标度因数的温度系数在-40℃到60℃的降幅达到了90%。得到的结果验证了具有增益补偿功能的微机械陀螺数字化驱动闭环可以较大幅度地提高微机械陀螺标度因数的稳定性。A digital drive closed-loop method with gain compensation was proposed to improve the stability of scale factor for a micro-machined gyroscope. The working principle of the micro-machined gyroscope was analyzed and the analysis results on the dynamic equation show that in order to improve the stability of the scale factor, the stability of drive-mode vibration speed of the gyroscope should be improved. However, the stability of drive-mode vibration speed of the gyroscope is dependent on the stability of gain of a C/V conversion circuit in the drive closed-loop. Therefore, a gain compensation algorithm was proposed and the digital drive closed-loop with gain compensation was designed by combining with a automatic gain control loop and a phase locked loop. Simulation results show when the gain of C/V conversion circuit changes 7.4% in relative, the amplitude of vibration velocity changes from 7.29~ without gain compensation to 0.12% with gain compensation. Experiment results indicate that the temperature coefficient of scale factor within --40℃ to 60℃ is reduced by 90% after gain compensation. It verifies that the digital drive closed-loop with gain compensation can significantly improve the stability of scale factor for the micro-machined gyroscope.

关 键 词：微机械陀螺仪 驱动闭环 数字化驱动 增益补偿 

分 类 号：U666.1[交通运输工程—船舶及航道工程] V241.5[交通运输工程—船舶与海洋工程]