高精度软件同步采样算法

软件同步采样是周期电气信号测量中最常用的采样方式。但常规软件同步采样方法存在采样同步精度不高、采样间隔误差累加递增、测量滞后等缺点。通过对软件同步采样实现过程的分析，找出了影响采样同步、测量滞后的主要原因．并提出了一种高精度、快速软件同步采样算法。这种方法具有计算量小，易于实现，实用有效的特点。信号周期和谐波测量的仿真结果，证实了所提方法对提高软件同步测量精度的有效性。

High-accuracy Method for Software Synchronous Sampling

Synchronous sampling by software is commonly used in digital measurement of periodic electric signals. However, it always introduces synchronous errors which degrade the measuring accuracy. The traditional methods of synchronous sampling by software are examined and the factors causing measurement delay and synchronization errors are found. A novel method to minimize these errors and to improve measuring accuracy is proposed. The method is easy to be realized and can achieve a noticeable improvement on measuring accuracy. The simulation results of both signal period computing and harmonic measurement show that the method is feasible and effective.