基于傅里叶解调算法的硅微陀螺仪控制系统设计与试验  

Design and test of silicon micromachined gyroscope control system based on Fourier demodulation algorithm

作　　者：杨成[1,2] 李宏生[1,2] 陈建元[1,2] 王晓雷[1,2] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096 [2]东南大学微惯性仪表与先进导航技术教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2014年第3期550-555,共6页Journal of Southeast University：Natural Science Edition

基　　金：预研基金资助项目(9140A09011313JW06119)

摘　　要：为了改善硅微陀螺仪控制精度,采用基于现场可编程门阵列(FPGA)实现的傅里叶解调算法,结合同步倍频采样技术,分别对硅微陀螺仪驱动轴检测信号和敏感轴检测信号进行解调.并借助自动增益控制(AGC)和锁相环(PLL)技术,实现硅微陀螺仪的闭环驱动控制和高精度解调输出.仿真和试验结果表明:相比于乘法解调,傅里叶解调算法具有更好的解调精度和更强的抗噪声能力;驱动振幅控制精度达到7.5×10-6,全温频率跟踪最大误差为50 mHz;试验陀螺的零偏稳定性由采用乘法解调算法的24.83(°)/h提高到采用傅里叶解调算法的10.65(°)/h.试验验证了傅里叶解调算法在硅微陀螺仪数字控制系统中的可行性和有效性.To further improve the control precision of a silicon micromachined gyroscope,the Fou-rier demodulation algorithm based on field programmable gate-array （FPGA）and the synchronous frequency multiplication sampling are adopted to demodulate the drive detection signal and the sensi-tive axis signal.With the automatic gain control （AGC ） technology and the phase-locked loop （PLL）technology,the closed-loop drive control and the high precision demodulated output of the silicon micromachined gyroscope are realized.Simulation and experimental results indicate that the Fourier demodulation algorithm has better accuracy and greater noise immunity than the multiplica-tion demodulation.The control accuracy of the drive detection voltage is up to 7.5 ＆#215;10 -6,and the maximum frequency tracking error over temperature is 50 mHz.The bias stability of the silicon mi-cromachined gyroscope is improved from 24.83 （°）/h by the multiplication demodulation algorithm to 10.65 （°）/h by the Fourier demodulation algorithm.Experiments verify that the design of digital control system based on Fourier demodulation is feasible and effective.

关 键 词：硅微陀螺仪 傅里叶解调算法 同步倍频采样 自动增益控制 锁相环 现场可编程门阵列 

分 类 号：V241.6[航空宇航科学与技术—飞行器设计]