摘要
本文研究了一种新的检测微弱正弦信号的新方法,利用正弦信号的特殊特性,引入参考信号,与被测信号进行多重互相关运算,成功检测淹没于噪声中的正弦信号。分别讨论了白噪声、谐波、直流电平干扰情况下的检测效果,给出了具体的仿真结果。实验结果表明,本文算法能提取出极低信噪比的微弱信号,对谐波和直流电平不敏感,同时本文的算法不会破坏微弱正弦信号的初相位信息,因此,工程适用范围更广。
A new method for weak sinusoidal signal in powerful noise is introduced in this paper.Because the sinusoidel signal has a particular trait,it is possible to detect the weak signals in powerful noise by multi-layer cross correlation algorithm.White noise,harmonic and DC level are particularly discussed and analyzed.Simulation results and conclusions are given.The simulations proves its feasibility and effectiveness to detect the weak sinusoidel signal.The algorithm of this paper will not destroy the phase information of weak sinuseidel signal and not sensitive to harmonic and DC interference.So it is much suitable in the use of engineer.
出处
《电子质量》
2010年第9期12-14,24,共4页
Electronics Quality
关键词
多重互相关
微弱信号
白噪声
Multi-layer cross correlation
weak signal
white noise
