摘要
随着DSP及集成电路技术的发展,应用ADC芯片实现高速、高精度数据采集已不再是难题;针对石英挠性加速度计输出信号的特点,设计了基于DSP及ADC的数据采集硬件电路,并分析了系统主要误差来源;应用DSP高速数据处理的特点,采用软硬件联合滤波,提高了系统抗干扰能力,并对加速度温度漂移进行实时误差补偿;由于ADC的转换结果仍存在一定误差,采用最小二乘法进行校准补偿,最后将处理结果以PWM调制脉冲输出;实验结果表明,通过软硬件措施,极大地提高了系统采集精度,满足了设计要求。
With the development of DSP and IC,it＇s much easier to design a high speed and high precision data acquisition system with ADC.After analyzing the signal of quartz flexure accelerometer,we design a data acquisition system based on DSP and ADC.Then the main error of the system is analyzed.Both digital filter and analog filter are designed for anti-interference.In order to eliminate the temperature drift of the accelerometer,a static model is made for error compensation.The least square method is also used to calibrate the results of ADC.And output the results as modulating plus through PWM.The result shows the accuracy is greatly improved with the application of both hardware and software methods.
出处
《计算机测量与控制》
CSCD
北大核心
2010年第11期2659-2662,共4页
Computer Measurement &Control
关键词
DSP
数据采集
石英加速度计
温度补偿
校准
DSP
data sample
quartz accelerometer
temperature compensation
calibration
