摘要
为了提高科氏振动陀螺仪驱动模态的控制精度与稳定性,设计了基于DDS-PLL技术的MEMS陀螺仪闭环驱动系统。利用基于直接数字频率合成器(DDS)算法的数字锁相环实现对陀螺谐振频率和相位的跟踪,采用数字自动增益模块(AGC)实现驱动幅值的稳定控制。实验结果表明,通过DDS算法实现的闭环驱动系统具有更高的控制精度,驱动幅值变化的均方差缩小到0.0011 mV,幅度稳定性为183 ppm,谐振频率变化的均方差缩减至0.07 Hz,频率稳定性为3.48 ppm,陀螺仪驱动模态的幅值和频率控制精度得到了提高。
In order to improve the control accuracy and stability of the driving mode of Coriolis vibration gyroscope,a closed-loop driving system of MEMS gyroscope based on DDS-PLL is designed.The digital phase-locked loop(PLL)based on direct digital frequency synthesizer(DDS)is used to track the resonant frequency and phase of gyro,and the digital automatic gain control(AGC)is used to control the driving amplitude stably.The experimental results show that the closed-loop driving system based on DDS algorithm can achieve higher control accuracy.The mean square error of the driving amplitude change is reduced to 0.0011 mV,the amplitude stability is 183 ppm,the mean square error of resonant frequency change is reduced to 0.07 Hz,and the frequency stability is 3.48 ppm.The precision of amplitude and frequency control of gyroscope driving mode is improved.
作者
姜波
郑雄斌
周怡
周同
苏岩
JIANG Bo;ZHENG Xiongbin;ZHOU Yi;ZHOU Tong;SU Yan(Nanjing University of Science and Technology,School of Mechanical Engineering,Nanjing 210094,China)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2024年第1期71-78,共8页
Journal of Chinese Inertial Technology
基金
国家自然科学基金(62271262)。
关键词
陀螺仪
锁相环
均方差
频率稳定性
gyroscopes
phase locked loop
mean square error
frequency stability
作者简介
姜波(1988-),男,副教授,从事MEMS陀螺仪研究。
