摘要
针对正弦信号同步采样的定量判定,以及不同步采样时同步误差的定量评价,提出了一种基于四参数拟合的评价判定方法,可避免同步判定时影响分辨力的±1的计点误差。在此基础上,定义并实现了同步误差的定量评价。在实际正弦曲线、方波曲线和三角波曲线的采集测量实验中,验证了所述方法的正确性及可行性。使用单频数字滤波处理后,将其推广应用到非正弦周期信号的同步采集测量评价中。本文所述方法可用在对同步要求较高的采集测量系统的同步特性定量评价中,也可用在准同步采样测量中,用于定量给出同步偏差,以进行测量误差的补偿和修正。
Aiming at the quantitative judgment of synchronous sampling of sinusoidal signals and the quantitative evaluation of synchronization error in asynchronous sampling,an evaluation and judgment method based on four-parameter fitting is proposed,which can avoid the point counting error of±1 that affects the resolution during synchronization judgment.On this basis,the quantitative evaluation of synchronization error is defined and realized.In the actual sine wave,square wave,and triangular wave acquisition and measurement experiments,the correctness and feasibility of the method are verified.After using single-frequency digital filter processing,it can be extended and applied to the synchronous acquisition of non-sinusoidal periodic signals.The method described in this paper can be used in the quantitative evaluation of synchronization characteristics of acquisition and measurement systems with high synchronization requirements,and can also be used in quasi-synchronous sampling and measurement to quantitatively give synchronization deviations for compensation and correction of measurement errors.
作者
梁志国
LIANG Zhiguo(National Key Laboratory of Science and Technology on Metrology&Calibration,Changcheng Institute of Metrology&Measurement,Beijing 100095,China)
出处
《计测技术》
2021年第4期18-22,共5页
Metrology & Measurement Technology
基金
国家重点研发计划(2017YFF0206202)。
关键词
计量学
同步采样
误差
正弦
拟合
准同步采样
metrology
synchronous sampling
error
sinusoidal
curve-fit
quasi-synchronous sampling
