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In this paper, we present a new method to estimate the frequencies of the harmonic signals embedded in strong chaotic interference. The method is based on wavelet multi-scale decomposition algorithm and correlation theory. Since the statistical characteristics of the harmonic signal and the chaotic interference are different, we use wavelet multi-scale decomposition algorithm to separate the harmonic...
In this paper, a cross fourth order moment minimum norm approach is proposed to achieve multi-path chirp time delay estimation. Because chirp signals are nonstationary, we define a special time-varying cross fourth order moment. Using this time-varying fourth order moment, the time delay estimation of the nonstationary chirp signals is converted into the parameter estimation of stationary signals...
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