一种新型的硅微机械陀螺数字读出系统

A New Digital Readout System for Silicon Micro-machined Gyroscope

为了简化系统设计,进一步改善陀螺的控制性能,提出了一种新型的微机械陀螺数字读出系统方案。该方案采用EPLL和AGC技术实现陀螺驱动模态的相位与幅度闭环控制,采用EPLL技术实现检测模态的信号解调。不仅降低了对陀螺品质因数的要求,而且省去了低通滤波器的设计。通过仿真实验不仅验证了该方案的可行性,还研究了EPLL参数对陀螺数字读出系统性能的影响。该方案对今后微机械陀螺系统的实现与性能的进一步提高有一定的指导作用,同时也为今后陀螺系统的误差补偿以及自标定、自校准奠定了基础。

In order to simplify the system design,and further improve the control performance of the silicon micromachined gyroscope(SMG),a new digital readout system program of the SMG is proposed.In this program,EPLL and AGC technologies are adopted to achieve the closed-loop control of the phase and amplitude of SMG's drive mode and EPLL is used for signal demodulation of SMG's detection mode,which has not only reduced the constraints of SMG's quality factor,but also eliminated the low-pass filter that has to be used for conventional programs.Simulation results not only verify the feasibility of the program,but also demonstrate the correlation between EPLL's parameters and the digital readout system performance of the SMG.This program lays the foundation for the further improvement of the SMG's system performance and the implementation of the SMG system's self-calibration and self-demarcation in future.