利用地声测量系统进行水中目标的探测具有比常规水中探测更大的优越性，但是地声信号易受很强的低频能量干扰。EMD方法可以根据信号产生的机理的不同将信号分解成不同的模态，从而达到去除强低频干扰的目的。文中进行地声信号的EMD处理来提取趋势项的成分，并建立了基于IMF分量的趋势判断准则。试验数据的处理结果表明，采用EMD方法可以在保留信号特性的条件下，有效地分离信号中的复杂趋势项干扰。

The detection of targets in water based on geoacoustic measurement system has more superiority than conventional detection methods used in underwater acoustic engineering. But the geoacoustic 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 of geoacoustic signals is presented in this paper，and the standard of EMD decomposition component tendency is established. Proved by the results of actual geoacoustic signal, on the condition of keeping full characteristics of the signal, the EMD method can eliminate the complicated trend of interference precisely.