噪声中正(余)弦信号相位差的检测

The Measurement of Phase Difference of Sine(Cosine) Signal in Noise

若两路正(余)弦被测信号含有加性噪声,要准确测量其相位差必须要采取一定措施消除噪声的影响。用正交双通道处理技术对此两信号进行互相关函数处理,可以检测出被噪声淹没的正(余)弦信号的相位差。

If two sine （cosine） signals to be measured contain additive noise, certain mea- sures must be adopted in eliminating noise influenees to eorreetly measure their phase differenees, and the submerged phase differenee of sine （cosine） signals eould be measured by using orthogonal two-ehannel processing technology to process the two signals.