Cross Correlation and time lag
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So in my project work, i placed two accelerometers on a single vibrating body and i want to find the timelag between the signals at either end...
[Correlation,lag]=xcorr(voltage1,voltage2);
corrlength=numel(Correlation);
[mag,Index] = max(abs(Correlation));
sampletime=0.003 ;%data acquisition
timelag=lag(Index)*(sampletime);
------------------------------------- voltage1 and voltage2 are bandpassed signals from the accelerometers in a specific noise range
But everytime i run the function, the timelag and lag amounts to zero, no matter how much i adjust the accelerometer sensitivity and position. Is it supposed to be zero? Or am i doing something wrong?
3 个评论
dpb
2015-4-20
I'd start by looking at the two raw data signals with a scope triggered off the input first, then Accel A and see if the experimental setup is ok first...
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