基于AGC线性化的谐振式加速度计相位噪声分析  

Phase noise analysis of resonance accelerometer based on AGC linearization

作　　者：夏蓬勃 丁徐锴 黄丽斌[1,2] XIA Pengbo;DING Xukai;HUANG Libin(School of Instrument Science and Engineering,Southeast University,Nanjing 210096,China;Key Laboratory of MicroInertial Instrument and Advanced Navigation Technology of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学仪器科学与工程学院,江苏南京210096 [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,江苏南京210096

出　　处：《传感器与微系统》2023年第4期31-34,42,共5页Transducer and Microsystem Technologies

摘　　要：谐振式加速度计系统运行过程中会引入噪声,导致输出信号的相位发生偏移,从而影响测频精度。同时,由于自动增益控制(AGC)回路非线性的影响,噪声的传递无法直接利用传递函数分析。为了减小噪声的影响,根据谐振式加速度计的工作原理与噪声理论,对谐振回路中引入的各种噪声进行了传递路径的线性化分析与数学推导,给出了相位噪声表达式。MATLAB曲线,Simulink噪声模型与谐振式加速度计高速采样的相位噪声一致,验证了相位噪声表达式与噪声模型的正确性。The operation of resonance accelerometer system will be disturbed by noise,which will cause the phase deviation of the output signal,thus affecting the precision of frequency measurement.At the same time,due to the nonlinear influence of automatic gain control(AGC)loop,the transmission of noise can’t be directly analyzed by transfer function.In order to reduce the effect of noise according to the working principle of resonance accelerometer and noise theory,series of noises introduced in resonant loop are analyzed and deduced mathematically using transfer path linearization method,and the expressions of the phase noise is given.MATLAB curve,Simulink noise model and phase noise of highspeed sampling of resonant accelerometer are consistent,which verifies the correctness of the phase noise expression and noise model.

关 键 词：谐振式加速度计 自动增益控制 线性化 相位噪声 仿真分析 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] V241.5[自动化与计算机技术—控制科学与工程]