【摘要】 设计了一种双框架解耦微机械振动陀螺,并分析陀螺的原理和恒幅驱动的必要性。建立了自激振荡和自动增益控制的测控电路模型,利用平均周期法分析了系统的稳态平衡点和起振条件。仿真验证了平衡点的准确性及幅度过冲的影响因素。测试得到陀螺的谐振频率和品质因数并用Allan方差分析1 h频率误差为0.06 Hz,稳定度为±5 ppm(1 ppm=10^-6)以内;幅值偏差最大为0.8 mV,8 min内漂移了0.4%。更多还原

【Abstract】 A dual frame decoupling micromechanical vibration gyroscope was designed, the principle of gyroscope and the necessity of constant amplitude drive were analyzed.The measurement and control circuit model of self-excited oscillation and automatic gain control circuit was established, and the steady-state equilibrium point and starting condition of the system were analyzed by using the average period method.Simulation verifies the accuracy of the equilibrium point and the influence factors of amplitude overshoot.The resonance frequency and quality factor of the gyroscope were tested and analyzed by Allan variance.The frequency error is 0.06 Hz in one hour, and the stability is within ±5 ppm(1 ppm=10^-6),the maximum amplitude deviation is 0.8 mV,and the drift is 0.4% in 8 minutes.更多还原