高精度石英加速度计自适应采集系统设计

Adaptive Data Acquisition System Design of High Precision Quartz Accelerometer

摘要:

为了保证高精度石英加速度计输出精度,采用将加速度计输出分段的方式设计了一个高精度数据采集电路；首先,通过切换采样电阻对不同输出段信号进行采样；其次,设计了低通滤波器进行滤波；然后,进行了包括跨阻放大、低通滤波器、电源的详细电路设计以及关键元器件的选择；最后,进行仿真实验验证；结果显示该方法既充分利用A/D芯片的量程,保证精度,又能满足宽量程要求；采集电路最低精度在±8×10-5g以内,最高精度在±10-5g以内,满足高精度惯性导航的需要。

Abstract:

In order to guarantee the output accuracy of high precision quartz accelerometer, a high precision data acquisition circuit is designed by segmenting the output of accelerometer. Firstly, change the sampling resistor for sampling signals from different segment; secondly, design a low-pass filter for filtering; then, make a detailed circuit design for trans-impedance amplifier, low-pass filter, power source, and select the key components; finally a simulation validation was processed. The results show that this method is not only making the most use of the measuring range of A/D, guaranteeing the precision, but also meeting the demand of wide-range. The maximal acquisition accuracy of the data acquisition circuit is ±8×10-5g and the minimum is ±10-5g, which can meet the requirement of high precision inertial navigation.