Numerical integration acceleration but correcting for the offset

How can I calculate displacement from acceleration but correcting for the offset?
Basically from the acceleration cruve I can get the curve of velocity and displacement doing something like this:
NewVel = cumtrapz(time, acceleration);
NewPos = cumtrapz(time,NewVel);
However I will get a ramp (an offset) how can I remove it to get proper displacement?

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2019-2-14

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2019-2-14

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