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为了增强硅微机械陀螺仪的零偏稳定性,减少其受温度的影响,从数字信号处理的角度提出了一种提高驱动模态驱动相位精确度的方法.通过零偏信号生成的原理,分析出驱动相位的偏差是影响其性能的主要因素.采用基于FPGA数字信号处理实现方式的锁相环闭环控制原理,实现了对驱动相位的精确控制.给出了一种抑制相位误差的解调方法.对比模拟电路,新型数字电路很好地抑制了零偏的漂移,零偏稳定性由60°/h 提高到19°/h.新的数字控制方法显著提高了对驱动相位的控制精度,达到了增强零偏稳定性的目的.
In order to enhance the stability of the bias of silicon micro-machined gyroscopes and reduce their influence by temperature, a method of improving the driving phase accuracy of driving mode is put forward from the perspective of digital signal processing.Based on the principle of zero-bias signal generation, The deviation of driving phase is the main factor that affects its performance. The closed-loop control principle based on FPGA digital signal processing is used to realize precise control of driving phase. A demodulation method to suppress phase error Compared with the analog circuit, the new digital circuit can well suppress the drift of zero bias and the stability of the bias from 60 ° / h to 19 ° / h.The new digital control method significantly improves the control accuracy of the driving phase, The purpose of enhancing the stability of the bias.