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So far.there are several traditional linear methods to detect signals frequency, they are Discrete Fourier Transform[1], Recursive Least Square method[2].Adaptive Filtering[3] and Kalman filtering[4].They are usually useful, but there are kinds of shortages when the frequency changes is very small, especially the signal is mixed with noise, and these methods fail to detect.Therefore.we need to find out a new and better method or technology to detect the frequency micro-variation of signal, which is significant to make the detection be more real-time and exact.