wave phase adjustment between several signals

Question

Ana 2014-8-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/151676-wave-phase-adjustment-between-several-signals

回答： Daniel kiracofe 2014-8-23

Hi!

Can anyone help me on this?

I have a file with 8 wave signals that belong to the same wave gauge S1:

time signal1 signal2 signal3 signal4.....

https://www.dropbox.com/sh/kz19ytfihg8vc8i/AAALiGMFQxBS78KT2hZ8Qihma

The ideia is to adjust the phase of the signals so that they start with the same wave phase and height. If I do this manually (as I did in the figure) I have to shift each signal in time until I find a proper overlapping for the 8 signals.

Is there any function/routine available for this purpose?

Many thanks!

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Ana 2014-8-20

time_phases1.csv

Hi,

Thanks for the comment. Here goes the '.csv' file.

Star Strider 2014-8-20

Thanks. I’ll work with it and see if I can provide a solution. No promises, though.

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Answer 1

Daniel kiracofe 2014-8-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/151676-wave-phase-adjustment-between-several-signals#answer_149590

I think xcorr() may help here. xcorr() will basically try every possible time shift for you, and let you know what shift makes the peaks and valleys line up "the best". I looked at your data, and you'll probably want to slice out the first few cycles and use xcorr on that instead of the whole data set.

Here is a short example from my website on the use of xcorr()

http://www.mechanicalvibration.com/Using_cross_correlation_lin.html