Cross Correlation Rxy problem

[wally424]

I am trying to cross correlate two signals, each with about 200 data points. both signals are correct and i can even see the lag between on the graphs. when i put the signals into the cross correlation vi my Rxy is in the thousands and the graph looks like a pointed triangle that goes up to the tens of thousands. is there some sort of normalization i have to do to the data? thanks

[Robert M]

Hello wally424,

It is quite normal for the cross correlation to be in the tens of thousands. Two methods of normalization are given in the following link:

Cross Correlation Normalization

You should be ending up with only about 400 data points on the x-axis. You mentioned yours is in the thousands; exactly how many are you getting?

If none of these suggestions help, or if I�m not correctly understanding your issue, please post the software and versions you are using, the applicable portions of your code, and any other information that may help, and I�ll be happy to look further into it.

Have a ni
ce day!

Robert M
Applications Engineer
National Instruments

[wally424]

sorry, i figured it out a couple days ago. i found that a previous post that explained how to normalize it, since then its been working fine. thanks alot though.