Study of the influence of transition IMF on EMD do-noising and the improved algorithm

The Empirical Mode Decomposition is a good method of do-noising which has great application potential.The existing do-noising methods based on EMD(Empirical Mode Decomposition) cannot effectively deal with the transition IMF(Intrinsic Mode Function) from the EMD of the original signal.Because of the noise aliasing in the transition IMF cannot be easily removed,the application of EMD in do-noising is limited.To solve this problem this paper studied the influence of transition IMF on EMD do-noising result,and proposes a method to remove the noise aliasing in the transition IMF.The envelope structure of inchoate do-noising results processed by single EMD would be changed with an opportune cosine signals,then the signal received is decomposed again by EMD and the noise aliasing in the transition IMF is remored.The do-noising results of analog signal show that it can effectively keep the useful signal and remove the noise aliasing in the transition IMF.Using this method to do-noise the actual seismic signal,it can suppress random noise and improve the SNR(signal to noise ratio) of seismic signal.