基于FPGA的MEMS陀螺仪SAR150实时数据采集系统设计

Design of Real-time Data Acquisition System for MEMS Gyroscope SAR150 Based on FPGA

针对传统MEMS陀螺仪输出信息为模拟量且易受干扰、噪声较大的问题,结合SAR150陀螺仪可以直接输出数字信号的特点,提出了一种新型的数字陀螺仪实时数据采集系统;该系统以FPGA为主控制器,通过SPI接口完成对MEMS陀螺仪SAR150的控制与数据的传输,实现了对陀螺仪输出信号的采集、实时传输及存储;通过将所研制的数据采集系统应用于SAR150陀螺仪测量角速率实验,并对测得数据进行误差分析,实验结果表明:数据采集系统采集输出的角速率值与理论值的绝对误差标准差均小于0.2°/s;且该系统的可靠性高、实时性好,为后续的陀螺仪测试及标定奠定了基础,有一定的工程应用价值。

According to the problem of traditional MEMS gyroscope output information for analog quantities and easy interference and larger noise, combining the characteristic of SAR150 gyroscope with digital signal, this paper introduces a new kind of real--time data acqui- sition system for digital gyroscope. The system which using FPGA as the main controller finished controlling the MEMS gyroscope SAR150 and data transmission through SPI interface, realizing the function of collection, real--time transmission and storage for the output informa- tion of gyroscope. By applying the data acquisition for angular rate measurement experiment and analyzing the measurement data error, the experimental results show that the absolute error standard deviation of the actual value and theoretical value is less than 0. 2°/s, at the same time, the reliability and real--time of the system was verified, which lay a foundation for the follow--up of the gyroscope test and calibra- tion, and have certain engineering application value.