Cross Correlation to determine Delay

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Samuel 2023-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/1977379-cross-correlation-to-determine-delay

评论： Tim 2023-6-2

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Hi,

I have 2 signals of equal length. The signals correlate but with a time delay. I thought of doing a cross-correlation between both signals to determine the lag at which both signals have the maximum correlation. I've written the following line of code to do that.

[c,lags]=xcorr(signal1,signal2,20);

Plotting both signals and their cross-correlation returns this.

I was expecting to see a peak at approx. positive or negative 10 because that's when both signals drop significantly. I can't seem to figure out why that isn't the case. Is it because both signals have the same length?

Any help would be very much appreciated!