同原有的模拟处理方式相比，具有更准确跟踪频率和可控带宽等优点。
Comparing with the former analog ones, it has good performance in accurate frequency trace and band control.
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.
只要信噪比不甚低，频点自跟踪频率估计是无偏的且估计方差接近理论下限。
FATAFE realizes unbiased estimation and its estimated variance approaches to theoretical lower bound if only signal-to-noise ratio is not very low.
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