采用递推傅氏算法测频，动态跟踪频率变化，实时调整采样率进行定点采样；
The recursive Fourier algorithm is used in frequency measuring to dynamically track the frequency change and real-timely adjust the sampling rate for fixed sampling points.
使用本算法，在测量时可以以固定采样率进行采样，不必根据电网频率调整采样间隔。
Using this algorithm, this paper has adopted fixed sampling rate when measuring without adjusting sampling intervals according to network frequency.
本文的主要研究工作和成果包括：介绍了在采样率与数据符号不同步的情况下，采用插值对定时进行调整的基本原理。
The main research work of this thesis includes:we study the basic theory of timing adjustment by interpolation under the circumstance that sampling is not locked to the incoming data.
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