摘要
高精度静电悬浮加速度计常采用功率谱密度估计（PSD）来评估分辨率水平,商用PSD分析仪需实时在线分析,且分析时间长、频域分辨率低、成本高。为此提出了一种线下PSD估计方法,利用简易采集系统采集噪声信号,再进行PSD估计。给出了正确的PSD估计表达式,推导了加速度计分辨率与PSD的关系,通过实验对比了该方法与HP35670A动态分析仪分析结果,实验结果验证了该方法的有效性。最后用该方法分析了研制的静电悬浮加速度计原理样机X1、Y和Z2三个通道加速度噪声的PSD,得到0.1 Hz处PSD分别为：8.07×10-5g/Hz1/2、3.29×10^-8g/Hz1/2和2.39×10^-7g/Hz1/2;在带宽0.001~0.1 Hz内分辨率分别为4.64×10^-5g、4.21×10^-8g和1.51×10^-7g。
Power spectrum density（ PSD） estimation is always used to evaluate the resolution of electrostatically suspended accelerometer（ ESA）. Commercial instrument for the PSD estimation need online estimating,and there are some other shortcomings,such as low frequency resolution and high cost. So a simple method for PSD estimation was proposed. The theory and formation of the method were given,so was the relation between PSD and resolution of ESA. The results of PSD,which were got by this method and HP35670 A dynamic analyzer,show that this method was valid. At last,the PSD in X1,Y and Z2 channels of ESA using this method was evaluated. The noise PSD at 0. 1 Hz are 8. 07 × 10^- 5,3. 29 × 10^- 8and 2. 39 × 10^- 7g / Hz1 /2,respectively. The resolution in the 0. 001 ~ 0. 1 Hz are 4. 64 × 10^- 5g,4. 21 × 10^- 8g and 1. 51 × 10^- 7g respectively.
出处
《仪表技术与传感器》
CSCD
北大核心
2015年第10期30-34,共5页
Instrument Technique and Sensor
基金
清华大学自主科研计划(20091081243)
关键词
功率谱密度估计
维纳辛钦定律
WELCH法
静电悬浮加速度计
power spectrum density estimation
Wiener-Khinchin theorem
welch method
electrostatically suspended accelerometer
