金属壳体振动陀螺的多参数温度补偿技术研究

Research on Multi-Parameter Temperature Compensation of Metal Shell Vibrating Gyroscope

金属壳体振动陀螺具有结构简单,精度高、体积小,可靠性高,寿命长等显著优势,在军用和民用领域都有广阔的应用前景。由于受材料特性影响,金属壳体谐振结构的Q值很难达到极高的水平,使得金属壳体振动陀螺的零偏漂移受温度的影响比较显著。传统的温度补偿方法存在滞回效应,补偿效果不理想。针对该问题,提出了一种多参数温度补偿方法。理论分析结果表明,力反馈模式下,阻尼不均匀变化是引起陀螺零偏漂移的主要因素。根据理论分析结果,选取正交反馈量,温度、驱动电压等三个变量作为补偿量;通过全温区测试,建立陀螺零偏漂移与补偿量的数学模型,利用该模型对陀螺零偏漂移进行补偿。补偿后,陀螺的全温区零偏漂移由补偿前的300(°)/h减小为10(°)/h,而采用传统温度补偿方法后的零偏漂移为35(°)/h,验证了该方法的有效性。

Metal shell vibration gyroscope has many advantages, such as simple structure, high precision, small size, high reliability and long life, etc. It is widely used in military and civil fields. Due to the influence of material characteristics, the Q factor of metal shell resonator is greatly difficult to reach a very high level, which makes significant influence of temperature on the zero drift of metal shell vibrating gyro. The traditional temperature compensation method has hysteresis effect and the compensation result is not ideal. Aiming at this problem, a multi-parameter temperature compensation method is proposed. The theoretical analysis results show that under the force feedback mode, the non-uniform damping variance is the main factor causing the gyro zero drift. According to the theoretical analysis results, three variables such as orthogonal feedback signal, temperature and driving voltage are selected as the compensation variables. Through the test over the whole temperature range, the mathematical model of gyro zero drift and compensation variables is established, and the gyro zero drift is carried out by using the model compensation. After compensation, the zero drift of gyro over the whole temperature range is reduced from 300(°)/h before compensation to 10(°)/h, while the zero drift after compensation by traditional temperature compensation method is 35(°)/h, which proves the effectiveness of this method.