随机采样系统的误差分析和校正技术研究  

Research on the Error Analysis and Correction Technique of Random Acquisition System

作　　者：张沁川[1] 王厚军[1] 

机构地区：[1]电子科技大学自动化工程学院,四川成都610054

出　　处：《计量学报》2013年第3期278-281,共4页Acta Metrologica Sinica

基　　金：基金项目：国家自然科学基金（60827001）

摘　　要：在随机采集系统中，采用模拟内插技术可提高系统的等效采样率，但是模拟内插中的时间间隔测量电路会受到温度、器件特性、随机噪声等因素的影响，导致测时准确度降低，重建波形质量下降。分析了其中的主要误差的影响及来源，并提出通过相干平均、低通滤波等方法来降低误差，提高测时的准确度，实验结果表明波形的有效位数提高了约3bit，信噪比提高了约2倍。In the random sampling system, analog interpolation technique is used frequently to improve the equivalent sampling rate. But time interval measurement （TIM） circuit is affected by temperature, device characteristics, random noise and other factors, so the time interval measurement error increases tremendously. The origin and affection of primary error is analyzed, and the method of reducing error is offered, for example, coherent averaging and low pass filter. It improves the accuracy of TIM and the signal to noise ratio of the waveform. The experimental results show that the effective number of bits（ENOB） is improved approximately 3 bit,the signal-to noise ratio improved by about 2 times.

关 键 词：计量学 模拟内插器 相干平均 时间间隔测量 随机采样 

分 类 号：TB973[一般工业技术—计量学]