【摘要】 分析了基于多重相关法的微弱正弦信号检测理论,并提出了一种新的正弦信号初相检测新方法。通过对原始信号进行多重自相关运算得到信噪比高,初相为零的参考信号,对参考信号和原始信号做互相关运算和自相关运算,通过解析求解即可提取原始正弦信号的初相信息,不需要知道原始正弦信号频率及幅度,尤其适合低信噪比下未知频率的正弦信号的初相估计,算法简单,准确度可以满足工程要求,具有一定的实用价值。更多还原

【Abstract】 Weak sinusoidal signal detection based on multi-layer correlation is introduced and a new detection method for initial phase of sinusoid signal is proposed.Because the sinusoidal signal has a particular trait,do multi-layer correlation calculation of original signal,reference signal with high SNR is obtained whose initial phase is zero.The initial phase of sinusoid signal is got by cross-correlation and auto-correlation calculation of reference signal and initial signal without knowing the frequency and the margin of initial signal.This method is especially suitable to be used in low SNR condition and when the frequency of original signal is unknown,and it has some practical value in engineering.更多还原