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为了有效控制陀螺驱动模态的工作状态,从原理上分析了微机械陀螺的驱动特性,提出了一个新型的微机械陀螺闭环驱动数字控制电路,即采用数字锁相环和自动增益控制方法分别控制驱动频率和振荡幅度.设计了带有现场可编程门阵列的数字处理电路,并进行了实验.结果表明:当温度变化时,驱动频率能够自动跟踪陀螺驱动模态的谐振频率,并且振荡幅值始终保持在设定值.在常温下驱动频率相对偏差为0.624×10-6,振荡幅值相对偏差为8.0×10-6,分别是模拟控制方案的0.094%和18.39%.因此,基于数字锁相环和自动增益控制的频率和幅值闭环驱动控制方案是可行的.
In order to effectively control the working state of the gyro-driven mode, the driving characteristics of the micromechanical gyro are analyzed theoretically, and a new type of digital control circuit for the gyro closed-loop drive is proposed, that is, the digital phase-locked loop and the automatic gain control Drive frequency and oscillation amplitude.A digital processing circuit with field programmable gate array is designed and tested.The results show that when the temperature changes, the driving frequency can automatically track the resonant frequency of the gyro-driven mode, and the oscillation amplitude The relative deviation of the driving frequency is 0.624 × 10-6 and the relative deviation of the oscillation amplitude is 8.0 × 10-6 at room temperature, which are respectively 0.094% and 18.39% of the analog control scheme.Therefore, Phase-loop and automatic gain control frequency and amplitude closed-loop drive control scheme is feasible.