By means of the principle of correlation analysis, this paper introduces an approximate method for estimating signal-to-noise ratio on random noise background.

本文利用相关分析的原理，提出一种在随机噪音的背景上估算信噪比的近似方法。

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But it can not make good analysis of the soft fault signal in the circuits which is random and unstable or can not reflect and extract the transient characters of the soft fault signal.

而要检测软故障，就要针对电路中的软故障信号进行分析，提取能够反映软故障信号的特征值。

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Gaussian random white noise is one of the mostly used signal form and is widely used in digital signal processing and analysis.

高斯随机白噪声是一种常用的信号形式，在信号分析和信号处理中具有重要价值。

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