Abstract
The DFD(Differential frequency disturbance) methods are introduced in this paper, we give detail process of how to estimate weak signal parameters use this methods. The chaotic system is very sensitive to the frequency of input weak signal, we select a fightable input signal as a standard base signal, then a harmonic weak signal are put in. we adjust the frequency of standard signal gradually, the motivation of chaotic critical state will change greatly, the numerical result prove that when the standard signal frequency equal to the frequency of harmonic weak signal, the power spectrum of chaotic system will turn to be increase, the input harmonic signal frequency will be calculated, the numeric analysis prove that the differential frequency disturbance method of solve the chaotic weak harmonic signal parameter estimation give great low SNR, it has very high estimate precision result.
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