该方法通过一个改进锁相环系统实时跟踪输入信号的基波瞬时相位，输出基波瞬时角频率，进而得到输入信号的基本频率估计。
The PLL system could obtain basic component of the input, track the instantaneous phase of basic component, and output instantaneous Angle frequency.
该方法通过一个改进锁相环系统实时跟踪输入信号的基波瞬时相位，输出基波瞬时角频率，进而得到输入信号的基本频率估计。
The PLL system could obtain basic component of the input, track the instantaneous phase of basic component, and output instantaneous Angle frequency.
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