一种提高国产ADC模块采样精度的方法  

A Method for Improving Sample Accuracy of Domestic ADC Module

作　　者：周永明[1] 许进亮 王淑炜 王真真[1] 张洪彬[1] 

机构地区：[1]北京航天发射技术研究所,北京100076 [2]北京宇航系统工程研究所,北京100076

出　　处：《计算机测量与控制》2017年第2期149-152,共4页Computer Measurement &Control

摘　　要：为解决武器装备自主可控问题,以国产的处理器和多通道模数转换器(ADC)为核心,设计了一种完全国产化的多通道模拟信号采集模块;由于目前国产模拟芯片特别是模数转换器的精度指标较差,造成模拟信号采集模块精度较低,实用性较差;为提高采样精度,首先在采样时采用递推平均滤波方法,抑制采集信号中的周期性干扰,降低采集的随机误差;其次,对预先测量的几组数值进行一元线性回归,据此对采样值进行最小二乘估计,降低采集的固有偏置误差和增益误差;试验结果表明,该多通道模拟信号采集模块可同时采集多路模拟信号,采样精度高,最大采集误差由0.8%降低到0.12%,并且该模块通道间一致性好,可靠性高,国产化率达到100%,在武器装备中有良好的应用前景。To solve the problem of equipment＇ independence, a completely domestic multi-channel analog signal acquisition circuit based on domestic CPU and ADC was designed. Because of the low precision of the current domestic analog chip, especially the analog-to-digital converter chip, the precision of the analog signal acquisition module was low, making the practicability poor. In order to improve the sample precision, the recursive average filtering method was used to suppress the periodic interference and reduce the random error. Secondly, a line- ar regression was performed on the pre-measured values, and the sample values were estimated by the least squares method to reduce the in- herent offset error and gain error. It could be concluded from the experiment results that the acquisition circuit could acquire multi-channel analog signal simultaneously, and had high acquisition precision. The biggest sample error was reduced from 0.8%to 0. 12%. There was good consistency between the module＇ s channels. The module was of high reliability and of 100% domestic rate, making it have good pros- pect for application.

关 键 词：提高 国产ADC 采样精度 递推平均滤波 最小二乘估计 

分 类 号：TH86[机械工程—仪器科学与技术]