一种基于多重相关法的相位差测量方法

研究了一种新的测量正弦信号相位差的方法,就是利用正弦信号的特殊性质,通过多次信号的自相关和互相关运算,能够检测信噪比很低的两路正弦信号之间的相位差,分别讨论了信号的信噪比,取样点数,A/ D的量化位数对测量结果的影响,并给出了具体的仿真结果。实验表明这种方法能有效的提取出被噪音严重污染的信号的相位差,而且算法简单,物理意义明确,精度却可以满足工程的要求。

Measuring Method for Phase Difference Based on Multi-layer Correlation

A new method of phase difference mearsuring is introduced.Because the sinusoidal sig- nal has a particular autocorrelation trait,it is possible to detect the phase difference of two unknown weak signal in powerful noise by multi-layer autocorrelation.and cross-correlation Length of sampled data,Sig- nal-to-Noise Ratio and number of ADC quantization bits which influence precision of phase difference measurement are particularly discussed and analysed.Simulation results and conclusions are given.The simulations proves its feasibility and effectiveness to detect the phase difference.Compared with other means,this method can be widely used because it has many virtues such as simple theoretic deduction and explicit physical signification,and it can satisfy the requirement of engineer.