The Spectral Correlation Analysis Method Of EMD Modal Components And Its Demodulation Analysis Of Gravity Solid Tide Signals

The tidal gravity signals are mixed signals by the sun,the moon and the earth itself three as a result of the interaction,it contains abundant information of important geophysical characteristics,so the characteristics of the tidal signal value reflects the sun,the moon and other celestial bodies affect the tidal force on earth.A common phenomenon caused by the tide force is mainly manifested in the change cycle of ocean tidal flood tide and ebb tide phenomenon.In order to understand and analyze the gravity solid tide signal,an orthogonal decomposition relation model of gravity earth tide signal is proposed.In order to illustrate the tidal gravity signals with orthogonal signal independent of the model through the harmonic component of gravity tide in the signal are decomposed into two mutually orthogonal vectors,and the theory of algorithms using empirical mode decomposition analysis tidal signal to separate the harmonic signal superposition synthesis.For the decomposed orthogonal harmonic components,the cyclic spectrum analysis algorithm is used to analyze the multiplicative modulation relation of harmonic signals.Finally through the simulation experiments show that the harmonic frequency extraction algorithm through theoretical value,value theory of cycle frequency harmonic frequency and tidal signal values coincide,so that the tidal signal decomposition model is proposed in this paper can effectively explain the relationship between various types of harmonic tidal gravity signals,and through the empirical mode decomposition algorithm to spectral analysis the verification algorithm and cycle.