Acceleration to Amplitude versus time
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Hello,
I have accelerometer data of acceleration versus time, and I need to integrate it twice to get amplitude versus time to eventually use the fourier transform to get a frequency. Currently, when I use cumtrapz to integrate the data it will always give me a pretty straight line. I need it to be something that looks like a sinusoid. Can you explain why this is happening/what I can do to fix it?
Also, how would I do the fourier transform on something that is an array with time and amplitude components (it seems as though fourier only takes in a single vector)?![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/210944/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/210944/image.png)
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Answers (1)
Amal George M
on 1 Apr 2019
It looks like the acceleration value is always positive. If appropriate, consider negating the effect of gravity from the data.
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