I was looking for some help on getting displacement from acceleration data (using an accelerometer). I found this old PF thread - https://www.physicsforums.com/archive/index.php/t-123128.html
I am familiar with the double integration/trapezoidal integration. It isn't much help.
The FFT method seems interesting. I don't understand it though.
Is there an explanation of this method. Does it have a name.

Please see FFT method mention by wolfpackdiver in the link above -