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EMD方法分解得到的模态信号分量一般为调频调幅波。提出利用循环相关谱对EMD分解的模态分量进行解调,以分解出模态分量中的载波成分和被调制成分,从而实现对信号的加性分解和乘性解调,揭示信号中各成分分量的物理意义。在应用实验中,将该方法用于重力固体潮信号分析,完整提取出半日波分量、日波分量和半月波分量,并揭示出:在重力固体潮信号中,日波和半日波是加性叠加关系,半月波以乘性调制方式被同时调制到半日波分量和日波分量中,而且,它们之间的调制方式为抑制载波调制方式。
EMD method to decompose the modal signal component is generally FM AM wave. It is proposed to use the cyclic correlation spectrum to demodulate the EMD decomposition modal component to decompose the carrier component and the modulated component in the modal component so as to realize the additive decomposition and the multiplicative demodulation on the signal, The physical meaning of the component. In the application experiment, the method is applied to gravity tide analysis, and the semi-day wave component, the day wave component and the half moon wave component are extracted intact. The results show that the daily wave and the semi-day wave are additive In superposition, the half-moon wave is modulated into the half-wave component and the day-wave component simultaneously in a multiplicative modulation manner, and the modulation method between them is to suppress the carrier modulation method.