The research on strong interterence separation of week signal

The detection of targets in water based on ground based measurement system has more superiority than conventional detection methods used in underwater acoustic engineering.But the receiving signal usually interfered with strong low frequency disturbances.The EMD(empirical mode decomposition) method can separate the signal into different modes of vibration,and then the strong interference can be removed after the procedure.The use of EMD method to extract the signal from the strong trend of interference signals is presented in this paper,and the standard of EMD decomposed component tendency is established.Proved by the results of actual signal,on the condition of keeping full characteristics of the signal,the EMD method can eliminate the complicated trend of interference precisely.