目前，利用混沌振子检测微弱信号的两种方法分别是：基于系统相轨迹变化的方法和基于系统特征指数的方法。

There are two kinds of methods in detection for weak signals based on chaos: one is based on phase transition of the chaotic system, the other is to use some characteristic exponent of the system.

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分析了检测信号的特征，并采用截止频率法成功地提取了微弱的缺陷回波信号。

The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.

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该方法利用信号与噪声具有不同循环频率的特性实现了信噪分离，能够比较容易地从复杂背景中提取出微弱的特征信息。

Then one-dimensional and two-dimensional cyclostationary features of faults are put forward and they can be used to separate useful signals from noise and detect weak faults easily.

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