基于石英挠性加速度计A/D与I/F数据采集系统的对比研究

Comparative study of A/D and I/F data acquisition system based on quartz flexible accelerometer

摘要:

为满足对寻北仪导航系统中加速度计采集数据的高精度要求，提出了基于石英挠性加速度计的A/D采集系统与I/F数据采集系统的对比研究。系统采用了高精度A/D转换芯片AD7693和V/F高精度转换芯片LM331分别对石英挠性加速度计采集的数据进行处理转换，以FPGA芯片XC7Z020为逻辑控制核心对转换的数据进行编帧处理，通过RS232总线将处理的数据发送到上位机。测试结果表明，在相同条件下，I/F采集系统转换的精度99.99%优于A/D采集系统转换的精度98.7%；短时间内，I/F采集系统采集的数据变化不大，A/D采集系统采集的数据变化大，所以I/F采集系统稳定性更好。

Abstract:

The test results show that under the same conditions, the conversion accuracy of the I/F acquisition system is 99.99% better than that of the A/D acquisition system conversion accuracy of 98.7%; in a short time, the data collected by the I/F acquisition system does not change much. The data collected by the D acquisition system varies greatly, so the I/F acquisition system has better stability.