time delay between two signals from the same source

2011 10 27
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Hi
Could someone help me to find the time delay between two signals coming from the same source by using the concepts of correlation and autocorrelation. I am new to matlab, so could you please explain from the basic concepts?
Thanks in advance

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Honglei Chen
Honglei Chen 2011-10-27

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You can use xcorr to determine the delay in samples and then use sampling frequency to find out the exact delay in time.
fs = 100;
t = 0:1/fs:1;
x = sin(2*pi*t);
y = sin(2*pi*t+pi/10);
[c, lags] = xcorr(x,y)
If you examine c, the maximum is at index 106, which corresponds t a lag of (see lags) 5. This means the two signals match at a delay of 5 samples. You can translate that to time by dividing the number of samples with the sampling frequency. You can also use findpeaks to automate the peak search.
HTH

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