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本文讨论高斯噪声环境下低信噪比弱调制ＡＭ信号的检测与识别问题。利用循环平稳信号谱相关函数的特点和单循环检测器（ＳＣＤ）完成对低信噪比弱调制ＡＭ信号的检测与调制识别。文中给出循环平稳信号频率平滑谱相关算法（ＦＳＭ）和用于低信噪比弱调制ＡＭ信号的检测的单循环检测器，并给出计算机模拟计算结果。
This paper discusses the detection and identification of weakly modulated AM signals with low signal-to-noise ratio in Gaussian noise environment. The detection and modulation identification of the weakly modulated AM signal with low signal-to-noise ratio is accomplished by using the characteristics of the cyclostationary signal spectrum correlation function and the single-cycle detector (SCD). In this paper, we give a single-cycle detector for detecting the smoothing frequency spectrum of smoothing signal and single-cycle detector for detection of weakly modulated AM signal with low signal-to-noise ratio. The results of computer simulation are also given.