The transient electromagnetic method has a maximum depth because of continuous attenuation by transmission of electromagnetic signal in underground.

由于电磁信号在地下传播时不断衰减，瞬变电磁测深法有一个最大探测深度。

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A filtering method based on wavelet transform with local maximum value was discussed. The method could distinguish signal from the noise according to the different features of scale change.

小波变换局部极大值滤波方法利用信号与噪声不同的尺度变化特性来区分信号与噪声，将噪声从信号中分离出来。

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This paper introduces cross-correlation detection theory and maximum likelihood theory and based on the two theories, puts forward a new method for weak signal detection.

简单介绍互相关检测的原理及最大似然理论，并在此基础上，提出了将互相关检测与最大似然理论相结合检测弱信号的新方法。

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