A detection method for weak signal with coherence average is presented, and the principle of cross-correlationdetection is introduced.
提出了采用相干平均法提高信号的信噪比并检测微弱信号的方法，介绍了相关检测的原理。
2
This paper introduces cross-correlationdetection theory and maximum likelihood theory and based on the two theories, puts forward a new method for weak signal detection.
The method which combines crosscorrelationdetection with chaos theory to detect the weak signals relative to central frequency in overvoltage monitoring is proposed in the paper.