This method is easy to compute the frequency offset and adopts the recursive DFT method.

该方法频率偏移量计算简单且采用递推dft，有效减少了计算量。

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The spectral leakage caused by the truncated signals results in frequency calculation error and slows frequency tracking. A Hanning windowed recursive DFT method is introduced.

但由于截断信号会产生频谱泄漏，使得相位和频率计算结果有一定误差，采用该方法跟踪频率，实时计算电网变化的频率速度较慢。

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Based on the prime radix DFT and number theory, an algorithm using the second order recursive filter and the zero factor prime radix Fourier Transform (ZFT) is presented.

从素基数DFT出发，应用数论理论讨论了一种应用二阶递归滤波结构的算法及零因子转换算法(ZFT)。

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Using a recursive algorithm of DFT, this thesis can locate fault time exactly, thus solved a tickler which had existed many years.

本文采用了DFT递推算法，能准确确定故障时刻，解决了存在多年的难题。

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Using a recursive algorithm of DFT, this thesis can locate fault time exactly, thus solved a tickler which had existed many years.

本文采用了DFT递推算法，能准确确定故障时刻，解决了存在多年的难题。

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